Medicare Financing
Patricia A. Davis
Specialist in Health Care Financing
September 19, 2013
Congressional Research Service
7-5700
www.crs.gov
R41436
CRS Report for Congress
Pr
epared for Members and Committees of Congress

Medicare Financing

Summary
Medicare is the nation’s health insurance program for individuals aged 65 and over and certain
disabled persons. Medicare consists of four distinct parts: Part A, or Hospital Insurance (HI); Part
B, or Supplementary Medical Insurance (SMI); Part C, or Medicare Advantage (MA); and Part D,
the prescription drug benefit. The Part A program is financed primarily through payroll taxes
levied on current workers and their employers; these are credited to the HI trust fund. The Part B
program is financed through a combination of monthly premiums paid by current enrollees and
general revenues. Income from these sources is credited to the SMI trust fund. Beneficiaries can
choose to receive all their Medicare services, except hospice, through managed care plans under
the MA program; payment is made on their behalf in appropriate parts from the HI and SMI trust
funds. A separate account in the SMI trust fund accounts for the Part D drug benefit; Part D is
financed through general revenues, beneficiary premiums, and state contributions. The HI and
SMI trust funds are overseen by a board of trustees that makes annual reports to Congress.
The 2013 report of the Medicare Board of Trustees estimates that the HI trust fund will become
insolvent in 2026, two years later than it had predicted in the 2012 report. Because of the way it is
financed, the SMI fund cannot face insolvency; however, the trustees project that SMI
expenditures will continue to grow rapidly, and thus place increasing demands on Medicare
beneficiaries and all taxpayers. The trustees estimate that total Medicare costs will increase from
3.6% of GDP in 2012 to 6.5% in 2087.
Although the Medicare trustees report that the financial outlook for the Medicare program
appears to have improved as a result of changes made by the Patient Protection and Affordable
Care Act as amended (ACA, P.L. 111-148), they caution that the projections in the report are
somewhat uncertain, due to the potential for future expenditure reductions not to materialize. In
addition, the report projections assume that reductions in physician payment rates scheduled
under current law will occur, although these reductions have usually been overridden by
Congress. As such, as it has done each year subsequent to the enactment of ACA, the Centers for
Medicare & Medicaid Services (CMS) Office of the Actuary issued a supplemental analysis that
provides projections based on an illustrative alternative to current law.

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Contents
Introduction ...................................................................................................................................... 1
Medicare Trust Funds ...................................................................................................................... 2
Hospital Insurance (HI) Trust Fund ........................................................................................... 3
Supplementary Medical Insurance (SMI) Trust Fund ............................................................... 4
Part B Financing .................................................................................................................. 5
Part D Financing.................................................................................................................. 5
Board of Trustees ....................................................................................................................... 6
Annual Trustees Report ............................................................................................................. 6
2012 Medicare Program Operations ................................................................................................ 7
Hospital Insurance Trust Fund Operations in 2012 ................................................................... 7
Supplementary Medical Insurance Trust Fund Operations in 2012 .......................................... 9
Short-Range Financial Soundness (10 Years) .................................................................................. 9
HI Short-Range Financial Status ............................................................................................. 10
SMI Short-Range Financial Status .......................................................................................... 11
Projected Date of HI Insolvency .................................................................................................... 12
Long-Range Financial Soundness (75 Years) ................................................................................ 13
HI Income and Costs Relative to Payroll Taxes ...................................................................... 14
Year-by-Year Estimates ..................................................................................................... 14
Actuarial Balance .............................................................................................................. 15
Unfunded Obligations ............................................................................................................. 16
HI Long-Term Obligations ................................................................................................ 16
SMI Long-Term Obligations ............................................................................................. 17
Medicare Costs as a Percentage of GDP ................................................................................. 18
Medicare Funding Warning (“Medicare Trigger”) ........................................................................ 19
Medicare Expenditures and the Federal Budget ............................................................................ 20
ACA and Medicare Spending .................................................................................................. 21
Concluding Observations ............................................................................................................... 22

Figures
Figure 1. Sources of Medicare Revenue: 2012 ................................................................................ 3
Figure 2. Medicare Expenditures ................................................................................................... 10
Figure 3. Short-Term HI Expenditures and Income ....................................................................... 11
Figure 4. HI Trust Fund Assets at Beginning of Year as a Percentage of Annual
Expenditures ............................................................................................................................... 13
Figure 5. Long-Range HI Income and Cost as a Percentage of Taxable Payroll ........................... 15
Figure 6. Medicare Cost and Non-Interest Income by Source as a Percentage of GDP ................ 18

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Tables
Table 1. Medicare Data for Calendar Year 2012 .............................................................................. 8
Table 2. Unfunded HI Obligations ................................................................................................. 16
Table 3. Unfunded Part B and Part D Obligations ......................................................................... 17
Table 4. SMI General Revenues as a Percentage of Personal and Corporate Federal
Income Taxes .............................................................................................................................. 20
Table A-1. Medicare Enrollment, 1970 - 2085 .............................................................................. 24
Table B-1. Medicare Income and Expenditures, Calendar Years 1970-2022 ................................ 26
Table C-1. Average Medicare Benefit Costs Per Beneficiary, Calendar Years 1970-2022 ............ 27
Table D-1. Operation of the Hospital Insurance Trust Fund, Calendar Years 1970-2022 ............. 28
Table E-1. Operation of the Part B Account of the SMI Trust Fund, Calendar Years 1970-
2022 ............................................................................................................................................ 29
Table F-1. Operation of the Part D Account in the SMI Trust Fund, Calendar Years 2004-
2022 ............................................................................................................................................ 30
Table G-1. Projected HI and SMI Expenditures as a Percentage of GDP ..................................... 31

Appendixes
Appendix A. Medicare Enrollment ................................................................................................ 24
Appendix B. Total Medicare Income and Expenditures (HI and SMI Combined) ........................ 26
Appendix C. Medicare Per Capita Expenditures ........................................................................... 27
Appendix D. Operation of the Hospital Insurance Trust Fund ...................................................... 28
Appendix E. Operation of the Supplementary Insurance Trust Fund, Part B Account .................. 29
Appendix F. Operation of the Supplementary Insurance Trust Fund, Part D Account .................. 30
Appendix G. Medicare Expenditures as a Percentage of GDP ...................................................... 31

Contacts
Author Contact Information........................................................................................................... 32

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Medicare Financing

Introduction
Medicare is a federal insurance program that pays for covered health care services of qualified
beneficiaries. It was established in 1965 under Title XVIII of the Social Security Act as a federal
entitlement program to provide health insurance to individuals 65 and older, and has been
expanded over the years to include permanently disabled individuals under 65. Generally,
individuals are eligible for premium-free Part A of Medicare if they or their spouse worked for at
least 40 quarters in Medicare-covered employment, are at least 65 years old, and are a citizen or
permanent resident of the United States. Individuals under 65 may also qualify for coverage if
they have a permanent disability, have end-stage renal disease (permanent kidney failure
requiring dialysis or transplant), or have amyotrophic lateral sclerosis (Lou Gehrig’s disease).1
Medicare consists of four parts—A through D. Part A covers hospital services, skilled nursing
facility services, home health visits, and hospice services. Part B covers a broad range of medical
services, including physician services, laboratory services, durable medical equipment, and
outpatient hospital services. Enrollment in Part B is voluntary, however most beneficiaries with
Part A also enroll in Part B. Part C, also known as Medicare Advantage, provides private plan
options, such as managed care, for beneficiaries who are enrolled in both Parts A and B. Part D
provides optional outpatient prescription drug coverage.2
Medicare serves approximately one in six Americans and virtually all of the population aged 65
and over. In 2012, the program covered 50.7 million persons (42.1 million aged and 8.5 million
disabled) at a total cost of $574 billion, accounting for about 21% of national health spending and
3.6% of Gross Domestic Product (GDP). Medicare is an entitlement program, which means that it
is required to pay for covered services provided to enrollees so long as specific criteria are met.
Since 1965, the Medicare program has undergone considerable change. Most recently, the Patient
Protection and Affordable Care Act (ACA, P.L. 111-148 as amended), made numerous changes to
the Medicare program that modify provider reimbursements, provide incentives to increase the
quality and efficiency of care, and enhance certain Medicare benefits.3 For example, under the
legislation, annual updates of the prices paid by Medicare for almost all non-physician categories
of health services are being reduced by the growth in economy-wide productivity (productivity
adjustments). The ACA also established a new Independent Payment Advisory Board (IPAB),
which, beginning in 2014, is required to make recommendations to reduce Medicare spending in
years in which Medicare costs are projected to exceed a target growth rate.4 The legislation did

1 In addition, individuals with one or more specified lung diseases or types of cancer who lived for six months during a
specified period prior to diagnosis in an area subject to a public health emergency declaration by the Environmental
Protection Agency (EPA) as of June 17, 2009, are also deemed entitled to benefits under Part A and eligible to enroll in
Part B.
2 For additional information on the Medicare program, see CRS Report R40425, Medicare Primer, coordinated by
Patricia A. Davis and Scott R. Talaga.
3 For additional detail, see CRS Report R41196, Medicare Provisions in the Patient Protection and Affordable Care
Act (PPACA): Summary and Timeline
, coordinated by Patricia A. Davis, and CRS General Distribution Memorandum,
Estimates of Medicare Savings in the Patient Protection and Affordable Care Act, by Patricia A. Davis, August 31,
2012, available upon request.
4 The board’s proposals will take effect unless Congress passes an alternative measure that achieves the same level of
savings. The board is prohibited from making proposals that ration care, raise taxes, increase Part B premiums, or
change Medicare benefits, eligibility, or cost-sharing. As of the date of this report, the board has not yet been
established. For additional information on IPAB, see CRS Report R41511, The Independent Payment Advisory Board,
(continued...)
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not, however, make changes to the physician sustainable growth rate (SGR) payment system;
unless Congress takes action in 2013, reductions in physician payment rates of about 25% will be
required beginning January 1, 2014.5 Additionally, unless Congress passes legislation later this
year to block automatic cuts required under the Budget Control Act of 2011 (BCA, P.L. 112-25),
the 2% reduction in Medicare benefit spending, which began April 1, 2013, could continue into
2014.6
This report provides an overview of how the Medicare program is financed, including a
description of the Medicare trust funds and a summary of key findings and estimates from the
2013 Report of the Medicare Board of Trustees7 regarding 2012 program operations and future
financial soundness.8
Medicare Trust Funds
Medicare’s financial operations are accounted for through two trust funds maintained by the
Department of the Treasury—the Hospital Insurance (HI) trust fund for Part A and the
Supplementary Medical Insurance (SMI) trust fund for Parts B and D. For beneficiaries enrolled
in Medicare Advantage (Part C), payments are made on their behalf in appropriate portions from
the HI and SMI trust funds. HI is primarily funded by payroll taxes, while SMI is primarily
funded through general revenue transfers and premiums (see Figure 1). The HI and SMI trust
funds are overseen by a board of trustees that provides annual reports to Congress.

(...continued)
by Jim Hahn and Christopher M. Davis.
5 Congress has overridden these required reductions in every year since 2003, most recently by the American Taxpayer
Relief Act of 2012 (ATRA, P.L. 112-240). Section 601 of the Act averts the SGR-determined reduction and maintains
the Medicare physician fee schedule payments at their current rates through December 31, 2013. See CRS Report
R40907, Medicare Physician Payment Updates and the Sustainable Growth Rate (SGR) System, by Jim Hahn and
Janemarie Mulvey.
6 For additional information on the BCA and required spending reductions, see CRS Report R41965, The Budget
Control Act of 2011
, by Bill Heniff Jr., Elizabeth Rybicki, and Shannon M. Mahan; and CRS Report R42050, Budget
“Sequestration” and Selected Program Exemptions and Special Rules
, coordinated by Karen Spar.
7 2013 Annual Report of the Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary Medical
Insurance Trust Funds
, May 31, 2013, http://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-
and-Reports/ReportsTrustFunds/Downloads/TR2013.pdf.
8 A short summary of the financial status of the Medicare program may be found in CRS Report R43122, Medicare
Financial Status: In Brief
, by Patricia A. Davis.
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Figure 1. Sources of Medicare Revenue: 2012
Payroll Taxes
38%
General Revenue
72%
75%
Beneficiary
85%
Premiums
Payments from
40%
States
Taxation of Social
Security Benefits
12%
13%
1%
26%
Interest and Other
8%
2%
3%
13%
6%
4%
2%
TOTAL MEDICARE
HI -
SMI -
SMI -
REVENUE
PART A
PART B
PART D
$537 Billion
$243 Billion
$227 Billion
$67 Billion

Source: 2013 Report of the Medicare Trustees, Table II.B1.
Note: Totals may not add to 100% due to rounding.
Hospital Insurance (HI) Trust Fund
Covered Part A benefits, namely, inpatient hospital services, skilled nursing facility services,
some home health services, and hospice care are paid for out of the HI trust fund. Payments are
also made for administrative costs associated with operating this part of the program.
Similar to the Social Security system, the HI portion of Medicare was designed to be self-
supporting, and is financed through dedicated sources of income rather than relying on general
tax revenues. The primary source of income credited to the HI trust fund is payroll taxes paid by
employees and employers; each pays a tax of 1.45% on earnings. The self-employed pay 2.9%.
Unlike Social Security, there is no upper limit on earnings subject to the tax.9 ACA imposes an
additional tax of 0.9% on high-income workers with wages over $200,000 for single filers, and
$250,000 for joint filers effective for taxable years beginning in 2013.10 (ACA also imposes an
additional tax on unearned income beginning in 2013; however, this tax is not credited to the trust
fund.)11

9 Prior to 1991, the upper limit on taxable earnings was the same as for Social Security. The Omnibus Budget
Reconciliation Act of 1990 (OBRA 90, P.L. 101-508) raised the limit in 1991 to $125,000. Under automatic indexing
provisions, the maximum was increased to $130,200 in 1992 and $135,000 in 1993. The Omnibus Budget
Reconciliation Act of 1993 (OBRA 93, P.L. 103-66) eliminated the upper limit entirely beginning in 1994.
10 See archived CRS Report R41128, Health-Related Revenue Provisions in the Patient Protection and Affordable Care
Act (ACA)
, for additional detail.
11 For more information on this tax, see CRS Report R41413, The 3.8% Medicare Contribution Tax on Unearned
Income, Including Real Estate Transactions
, by Mark P. Keightley, and the 2013 Medicare Trustees Report, page 24.
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Additional income to the HI trust fund consists of: premiums paid by voluntary enrollees who are
not entitled to premium-free Medicare Part A through their (or their spouse’s) work in covered
employment; a portion of the federal income taxes paid on Social Security benefits;12 and interest
on federal securities held by the trust fund.
The HI trust fund is primarily an accounting mechanism used to track whether the program has
sufficient income and assets to make payments for Part A benefits.13 When the government
receives Medicare revenues (payroll taxes), income is credited by the Treasury to the appropriate
trust fund in the form of special issue interest-bearing government securities.14 (Interest on these
securities is also credited to the trust funds.) The tax income exchanged for these securities then
goes into the general fund of the Treasury and is indistinguishable from other cash in the general
fund; this cash may be used for any government spending purpose. When payments for Medicare
Part A benefits are made, the payments are paid out of the general treasury, and a corresponding
amount of securities is deleted from (written off) the HI trust fund.
The trust fund surpluses are not reserved for future Medicare benefits, but are simply
bookkeeping entries that indicate how much Medicare has lent to the Treasury (or alternatively,
what is owed to Medicare by the Treasury). From the unified budget perspective, these “asset”
balances are regarded as future spending obligations and are thus treated as liabilities. (See the
“Medicare Expenditures and the Federal Budget” section for an overview of differences in trust
fund and unified budget accounting conventions.)
As long as the HI trust fund has a balance, the Treasury Department is authorized to make
payments for Medicare Part A services. To date, the HI trust fund has never run out of money
(i.e., become insolvent), and there are no provisions in the Social Security Act that govern what
would happen if that were to occur. For example, there is no authority in law for the program to
use general revenue to fund Part A services in the event of such a shortfall. Since the beginning of
the Medicare program, the payroll tax rate has been adjusted periodically by Congress as one of
the mechanisms to maintain the financial adequacy of the HI trust fund.15 Additonally, Congress
has taken numerous actions to slow the growth in expected Part A spending.16
Supplementary Medical Insurance (SMI) Trust Fund
Medicare Part B benefits include physician services, outpatient hospital care, some home health
services, durable medical equipment, diagnostic tests and other services; Part D outpatient
prescription drug benefits are paid for out of the Supplementary Medical Insurance (SMI) trust

12 Since 1994, the HI fund has had an additional funding source. OBRA 93 increased the maximum amount of Social
Security benefits subject to income tax from 50% to 85% and provided that the additional revenues would be credited
to the HI trust fund.
13 The Congressional Budget Office argues that trust fund balances are not meaningful from an economic standpoint,
rather they primarily serve a bookkeeping role. See Congressional Budget Office, Federal Debt and Interest Costs,
December 2010, http://www.cbo.gov/sites/default/files/cbofiles/ftpdocs/119xx/doc11999/12-14-federaldebt.pdf.
14 Unlike marketable securities, special issues can be redeemed at any time at face value. Investment in special issues
gives the trust funds the same flexibility as holding cash.
15 Historical Medicare payroll tax rates may be found in Appendix B of CRS Report RS20946, Medicare: Insolvency
Projections
, by Patricia A. Davis.
16 Specific actions that have been taken are outlined in CRS Report RS20946, Medicare: Insolvency Projections.
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fund.17 Unlike the HI program, the SMI program was not intended to be fully supported through
dedicated sources of income. Instead, it relies primarily on general tax revenues and beneficiary
premiums as revenue sources. Beginning in 2011, additional revenues from an annual fee
imposed on certain manufacturers and importers of branded prescription drugs (including
biological products and excluding orphan drugs) are being credited to the SMI trust fund.18
Because contributions (general revenue and premiums) into the SMI trust fund are automatically
updated each year to ensure that the program has enough money to continue operating, the SMI
trust fund is kept in balance and will remain in financial balance indefinitely (i.e., the SMI trust
fund cannot become insolvent). Income from these sources is credited to the SMI trust fund and
any SMI revenues that exceed SMI spending accumulate in the SMI trust fund; however, SMI
trust fund balances are generally small. Similar to HI, the basic structure of the SMI financing
system can be changed only through an act of Congress.
Part B Financing
Medicare Part B is financed mostly by federal general revenues, with beneficiaries’ premiums set
to cover 25% of estimated Part B program costs for the aged.19 The 2013 monthly premium is
$104.90 for most Medicare Part B enrollees, and individuals who receive Social Security benefits
have their Part B premium payments automatically deducted from their Social Security benefit
checks.20 Since 2007, higher-income enrollees pay higher premiums.21 As a result of ACA, the
income thresholds used to determine which beneficiaries are subject to higher Part B premium
rates will be frozen at 2010 levels through 2019. Over time, this freeze will result in a larger
number of beneficiaries paying the higher premiums and is expected to bring in increased revenue
to the SMI trust fund.
Part D Financing
Medicare Part D is primarily financed through a combination of beneficiary premiums and
federal general revenues. In addition, certain transfers are made from the states. These transfers,
referred to as “clawback payments,” represent a portion of the amounts states could otherwise
have been expected to pay for drugs under Medicaid if drug coverage for the dual-eligible

17 The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (MMA, P.L. 108-173), which
created the Part D outpatient prescription drug benefit, added the Part D account to the SMI trust fund. The Part D
program began operation in 2006.
18 See archived CRS Report R41128, Health-Related Revenue Provisions in the Patient Protection and Affordable Care
Act (ACA)
, for more detail.
19 See CRS Report R40082, Medicare: Part B Premiums, by Patricia A. Davis.
20 Due to a “hold harmless” provision in the Social Security Act, (Section 1839(f)) an individual’s Social Security
check cannot go down from one year to the next as a result of the annual Part B premium increase. High-income
individuals, new enrollees, those eligible for both Medicare and Medicaid (dual-eligibles), and those who do not have
premiums deducted from thier Social Security checks are not covered by this provision.
21 The higher monthly premium amounts for 2013 are based on 2011 income levels and are (1) $146.90—for single
beneficiaries with annual incomes of $85,000.01-$107,000 or for each member of a couple filing jointly with incomes
of $170,000.01-$214,000; (2) $209.80—for single beneficiaries with incomes of $107,000.01-$160,000 or for each
member of a couple filing jointly with incomes of $214,000.01-$320,000; (3) $272.70—for single beneficiaries with
incomes of $160,000.01-$214,000 and each member of a couple filing jointly with incomes of $320,000.01-$428,000;
and (4) $335.70—for single beneficiaries with incomes greater than $214,000 and each member of a couple filing
jointly incomes above $428,000.
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population (those who qualify for both Medicare and Medicaid) had not been transferred to Part
D.
In 2013, the base monthly premium is $31.17; however, beneficiaries pay different premiums
depending on the plan they have selected (and whether they are entitled to low-income premium
subsidies). Part D premium payments may be automatically deducted from Social Security
benefit checks, paid directly to the prescription drug plan sponsor, or made through an electronic
funds transfer.22 Premiums for the Part D program are required to cover 25.5% of standard benefit
costs; however, as recipients of the Part D low-income subsidies are not required to pay
premiums, premiums covered only about 12% of Part D program costs in 2012 (see Figure 1). As
required by ACA, beginning in 2011, high-income Part D prescription drug program enrollees are
required to pay higher premiums similar to high-income Part B enrollees; the income thresholds
are set at the same levels as those under Part B and frozen in the same manner through 2019.
Board of Trustees
The Medicare Board of Trustees was established under the Social Security Act to oversee the
financial operations of the HI and SMI trust funds. By law, the six-member Board is composed of
the Secretary of the Treasury, the Secretary of Health and Human Services, the Secretary of
Labor, the Commissioner of Social Security, and two public members (not of the same political
party) nominated by the President and confirmed by the Senate.23 The Secretary of the Treasury is
the Managing Trustee. The Administrator of the Centers for Medicare & Medicaid Services
(CMS) is designated Secretary of the Board.
Annual Trustees Report
The Medicare Board provides an annual report to Congress on the operations of the trust funds.
Financial projections included in the report are made by CMS actuaries using major economic
and other assumptions selected by the trustees based on current law. Among the variables used are
estimations of consumer price index (CPI), fertility rate, mortality rate, workforce size, wage
increases, and life expectancy. The assumptions are reviewed annually and updated as warranted
by new analyses of trends and data. The report includes three forecasts ranging from pessimistic
(“high cost”) to mid-range (“intermediate”) to optimistic (“low cost”). The intermediate
projections represent the trustees’ best estimate of economic and demographic trends and are the
projections most frequently cited.
The 2013 report of the Medicare trustees was issued May 31, 2013.24 However, the report warned
that estimates based on current-law assumptions may not be realistic. As such, the actuaries of
CMS conducted a separate analysis that provides projections based on an “illustrative alternative”

22 The “hold harmless” provision described in the footnote on the previous page does not apply to Part D; beneficiaries
are not protected from Part D premium increases.
23 The nominations of Charles P. Blahous III and Robert D. Reischauer to be public members of the Medicare and
Social Security Boards of Trustees were confirmed by the Senate on September 16, 2010. The seats for the two public
members had been vacant since 2008.
24 The 2013 report includes data on actual expenditures and income through 2012, and projections for years 2013 and
beyond. 2013 Annual Report of the Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary
Medical Insurance Trust Funds
, http://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-
Reports/ReportsTrustFunds/Downloads/TR2013.pdf.
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to current law.25 The alternative estimates are based on the assumption that the economy-wide
productivity adjustments mandated by ACA would be made through 2019, but then would be
phased out from 2020 to 2034, and that IPAB recommendations for cost reductions would not be
implemented. The alternative scenario also assumes that, instead of being cut, physician
payments will grow annually by 0.7% each year.
The projection methodology used to estimate future Medicare spending is reviewed periodically
by an independent panel of expert actuaries and economists who make recommendations to the
Board regarding the most appropriate long-range growth assumptions for Medicare projections.
Most recently, the Board of Trustees convened an independent panel of expert actuaries and
economists in 2010 to make recommendations to the Board regarding the most appropriate long-
range growth assumptions for Medicare projections. The panel issued its final report in 2012, and
one of its recommended models was used to develop long-term projections in the 2013 Trustees
Report.26
2012 Medicare Program Operations
In calendar year (CY) 2012, Medicare provided about 50.7 million beneficiaries with benefits at a
total cost of about $574 billion, or $12,103 per enrollee. (See Appendix A, Appendix B, and
Appendix C for historical and projected enrollment, total Medicare income and expenditures, and
per capita expenditures.) Because HI and SMI have different funding mechanisms, a description
of each fund’s 2012 operations is presented separately below.
Hospital Insurance Trust Fund Operations in 2012
As shown in Table 1, in CY2012, total income to the HI trust fund was $243.0 billion. Payroll
taxes of workers and their employers accounted for $205.7 billion (84.7%), with the remainder
coming from interest and government credits, premiums (from those buying into the program),
and taxation of Social Security benefits. The HI program paid out $266.8 billion; most of which
was for benefit costs, and about 1.5% was for administrative expenses. Similar to years 2008
through 2011, expenditures again exceeded income in 2012, and the trust fund balance was
reduced from $244.2 billion at the end of 2011 to $220.4 billion at the end of 2012 (a loss of
$23.8 billion).27 (See Appendix D for funding amounts in prior years and estimates for future
years.)

25 2013 Annual Report of the Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary Medical
Insurance Trust Funds, Appendix C: Illustrative Alternative Projections; and memo from John D. Shatto and M. Kent
Clemens, CMS Office of the Actuary, “Projected Medicare Expenditures Under Illustrative Scenarios with Alternative
Payment Updates to Medicare Providers,” May 31, 2013, hhttp://www.cms.gov/Research-Statistics-Data-and-Systems/
Statistics-Trends-and-Reports/ReportsTrustFunds/Downloads/2013TRAlternativeScenario.pdf.
26 Review of Assumptions and Methods of the Medicare Trustees’ Financial Projections, Technical Review Panel on
the Medicare Trustees Reports, December 2012, http://aspe.hhs.gov/health/reports/2013/MedicareTech/
TechnicalPanelReport2010-2011.pdf.
27 In comparison, in CY2011, total income was $228.9 billion and total disbursements were $256.7 billion; this
represents an increase in income of $14.1 billion (a 6.2% increase) and a growth in expenditures of $10.1 billion (a
3.9% increase) from 2011 to 2012.
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Table 1. Medicare Data for Calendar Year 2012

HI - Part A
SMI - Part B
SMI - Part D
Total Medicare
Enrollment (millions)




Aged
41.8
38.7
n/a
42.1
Disabled
8.5
7.7
n/a
8.5
Total 50.3
46.4
37.4
50.7
Average expenditures
$5,227 $5,097 $1,779 $12,103
per enrollee
Trust Fund Balance at
$244.2 $79.7 $1.0
$324.9
end of 2011 (billions)





Total Income
$243.0
$227.0
$66.9
$536.9
Payrol Taxes
205.7


205.7
Interest
10.6
2.8
0.0
13.4
Taxation of Benefits
18.6


18.6
Premiums
3.4
58.0
8.3
69.8
General Revenue
0.5
163.8
50.1
214.4
Transfers from States


8.4
8.4
Other
4.1
2.4

6.5





Total Expenditures
$266.8
$240.5
$66.9
$574.2
Benefits
262.9
236.5
66.5
565.9
Hospital
139.7
39.1

178.8
Skilled Nursing
28.0


28.0
Home Health Care
6.8
11.8

18.6
Physician Services

69.6

69.6
Private plans (Part C)
70.2
66.0

136.2
Prescription Drugs


66.5
66.5
Other
18.1
50.1

68.2
Administrative Expenses
$3.9
$3.9
$0.4
$8.3





Net Change
-$23.8
-$13.5
$0.0
-$37.3
Trust Fund Balance at
$220.4 $66.2 $1.0
$287.6
end of 2012
Source: 2013 Report of Medicare Trustees, Table II.B1.
Notes: Totals do not necessarily equal the sums of rounded components; n/a = data not available.
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Supplementary Medical Insurance Trust Fund Operations in 2012
In CY2012, the SMI trust fund (Part B and Part D accounts combined) brought in $293.9 billion
in revenue ($227.0 billion from Part B and $66.9 billion from Part D), and expended $307.4
billion ($240.5 billion from Part B and $66.9 from Part D), with accumulated SMI trust fund
surpluses from prior years making up the $13.5 billion difference. General revenues accounted
for 72.8% of total revenues, and premiums accounted for 22.6%.28 (See Table 1 for 2012 Parts B
and D operations data.)
Of the $227.0 billion in income to Part B, general revenues made up $163.8 billion of that amount
(72.2%), premiums accounted for $58.0 billion (25.6%), and interest and other income made up
the remaining $5.2 billion (2.3%). In 2012, the program paid out $240.5 billion; similar to HI,
almost all of this amount was used to cover benefits and 1.6% covered administrative expenses.29
(See Appendix E for historical and projected income and expenditures in the SMI Part B
account.)
Of the $66.9 billion in Part D income, general revenues accounted for $50.1 billion (74.9%),
premiums accounted for $8.3 billion (12.4%), and transfers from states for $8.4 billion (12.6%).
Almost all of the 2012 Part D program expenditures of $66.9 billion were used to pay benefit
costs and 0.6% was used for administrative expenses.30 (See Appendix F for historical and
projected income and expenditures in the SMI Part D account.)
Short-Range Financial Soundness (10 Years)
Over the next 10 years, total Medicare expenditures are projected to increase at an average annual
rate of 6.6%,31 with total spending growing from $574.2 billion in 2012 to close to $1.1 trillion in
2022 (see Figure 2 and Appendix B). The average growth rate reflects the expected growth in the
number of individuals eligible for Medicare as well as expected increases in utilization and
complexity of services per beneficiary and in the prices of those services. The growth rate also
factors in ACA changes that affect cost growth rates, such as the productivity adjustments to the
annual payment updates to certain providers and changes in payments to Medicare Advantage
plans. Additionally, these growth rates assume that the scheduled physician payment reductions of
about 25% in 2014 will go into effect.

28 In comparison, in CY2011, total income for SMI was $301.0 billion and total expenditures were $292.4 billion. This
represents a growth in SMI expenditures of $15.0 billion, or an increase of 5.1%, from 2011 to 2012.
29 This represents an expenditure increase of 6.7% over the $225.3 billion in Part B expenditures in 2011.
30 The 2012 Part D expenditures represent a 0.3% decrease from the 2011 expenditures of $67.1 billion.
31 By comparison, total Medicare expenditures grew at an average annual rate of 8.0% from 1985 to 2012.
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Figure 2. Medicare Expenditures
Comparison of Estimates of 2009 – 2013 Medicare Trustees Reports
1200
2009 Report
1000
2010 Report
2011 Report
2012 Report
800
2013 Report
600
lions
$ bil

400
200
0
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022

Sources: Data from the 2009, 2010, 2011, 2012, and 2013 Reports of the Medicare Boards of Trustees, Table
III.A1 (2009-2011) and Table V.B1 (2012 and 2013).
Notes: The 2009 report was issued prior to ACA enactment. Reports issued in 2010 and beyond incorporate
ACA changes into projections of estimated spending. The 10-year projection window for the 2009 report only
extended to 2018; there are no corresponding projections for 2019 through 2022. Similarly, the 2010, 2011, and
2012 report projections only extend to 2019 through 2021, respectively.
HI Short-Range Financial Status
In the short term, the adequacy of the HI trust fund is determined by comparing its assets at the
beginning of the year to expected costs for that year. The trustees consider the fund to be adequate
if the ratio of assets to expenditures is at least 100% at the beginning of and throughout the 10-
year projection period.32 The trustees note that the HI fund is not adequately financed over the
next 10 years. Specifically, the new report states that the fund fails to meet the short-range (i.e.,
10-year, 2013-2022) test of financial adequacy because total HI assets at the start of the year
($220.4 billion) are expected to be below 100% of expenditures during 2013. The trustees also
project that the ratio of trust fund assets to expenditures will decline steadily through 2022.
HI expenditures have exceeded income every year since 2008 and are projected to continue doing
so under current law through 2014. In 2009 and 2010, income from payroll taxes decreased
substantially due to higher unemployment and slow growth in wages. While revenues increased
somewhat in 2011, they did not keep pace with the growth in expenditures resulting from
increased utilization and updates to provider payment rates. In 2012, HI taxable earnings, and

32 If the ratio is less than 100% at the beginning of the 10-year period, it must increase to 100% within 5 years and then
remain at or above 100% during the rest of the period. This amount is considered a sufficient contingency reserve to
allow Congress enough time to address any anticipated short-term financing problems.
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therefore income from payroll taxes, were slightly less than expected, and the HI trust fund
experienced a deficit of $23.8 billion.
Income is expected to increase at a faster rate than expenditures through 2017 due to the projected
economic recovery, the application of an additional 0.9% HI payroll tax for high-income
enrollees beginning in 2013, and the 2% reduction in benefit spending required by BCA from
April 1, 2013 through March 31, 2022.33 Specifically, over the next 10 years, HI income is
expected to grow on average by 6.0% per year, while expenditures are expected to grow at an
average rate of 5.5% per year. From 2015 through 2020, the HI trust fund is expected to run a
slight surplus (see Figure 3); after that period, expenditures are once again expected to outpace
income.
Figure 3. Short-Term HI Expenditures and Income
500
Total Income
450
Payroll Taxes
400
Expenditures
350
Assets
) 300
ns 250
illio
b
(
200
$
150
100
50
0

Source: Data from 2013 Report of Medicare Trustees, Table III.B4.
Note: The trustees report does not project dol ar figures beyond 2022.
SMI Short-Range Financial Status
As premium and general revenue income for Medicare Parts B and D are reset each year to match
expected costs, the SMI trust fund is deemed to be adequately financed over the next 10 years and
beyond. However, over the past five years, Medicare Part B costs have been increasing rapidly—
by an average of 6.1% annually, exceeding GDP average growth by 3.8 percentage points. If the
physician payment cuts are allowed to go into effect at the end of 2013, Part B expenditures (and
corresponding income) are expected to grow at a slower average growth rate of 5.1% annually
over the next five years (2013-2017), slightly lower than GDP growth over the same period
(5.4%). If Congress overrides these reductions as it has done in the past, the Part B growth rate
during this period is projected to instead average about 6.3% each year. For Part D, annual
average growth over the past five years has been around 6.1%; however, due to costs associated

33 See CRS Report R42050, Budget “Sequestration” and Selected Program Exemptions and Special Rules, coordinated
by Karen Spar, for information on how sequestration is applied to Medicare.
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with the gradual elimination of the coverage gap34 and expected growth in the number of
enrollees, the average annual increase in expenditures is estimated to be 9.3% through 2017.35
Part D cost estimates are somewhat lower than estimated in the prior trustees report due to a
larger than expected impact of the expiration in 2012 of several major drug patents, continued
growth in the utilization of generic drugs, and lower projected expenditures for 2013.
Projected Date of HI Insolvency
Medicare’s fiscal health is often gauged by the projected solvency of the HI trust fund.36 As noted
in the section “Medicare Trust Funds,” in years in which HI expenditures exceed income, the
program still has authority to continue to make payments as long as the trust fund has a balance.
However, when the trust fund balance reaches $0, it is deemed insolvent and this part of the
program would no longer have the authority to cover expenditures that exceed HI trust fund
income. The 2013 trustees report estimates that the HI trust fund will become insolvent in 2026,
two years later than projected in last year’s report (see Figure 4). The improved projections are
primarily due to lower than expected expenditures in 2012, the base year used to project future
expenditures, and a larger than previously projected impact of ACA payment methodology
changes on Medicare Advantage costs.37
Beginning in 2004, HI expenditures began exceeding tax income (from payroll taxes and from the
taxation of Social Security benefits). Expenditures began to exceed total income (tax income plus
all other sources of revenue) in 2008. (Refer to Figure 3 for illustration of expenditure and
income trends through 2022.) At that time, HI assets (the balance of the HI trust fund at the
beginning of the year) were used to meet the portion of expenditures that exceeded income (the
HI deficit). Expenditures have exceeded income every year since then, and are expected to
continue doing so through 2014. Although the trust fund is projected to run a small surplus in
years 2015 through 2020, after that time expenditures are expected to again exceed income, with
trust fund assets making up the difference until the asset balance is depleted in 2026. At that time,
the trust fund is projected to only have sufficient income to cover 87% of Part A expenditures.
Unless action is taken prior to that date to increase HI revenue and/or decrease expenditures,
Congress would need to appropriate additional funding (e.g., through general revenue transfers)
to make up for these deficits and to allow for full and on time payments to providers of Part A
services.

34 After the beneficiary and the prescription drug plan have spent a certain amount of money for covered drugs during a
year, there is a gap in Part D coverage. During the coverage gap (also known as the “doughnut hole”), the beneficiary
pays a large portion of his or her prescription drug expenditures. Once a certain threshold is reached, Medicare again
begins providing substantial coverage. The ACA gradually reduces the amount of beneficiary cost-sharing during this
gap each year from 2011 to 2020.
35 The average annual growth per enrollee is expected to be 6.3%.
36 For a history of projections of insolvency dates, see CRS Report RS20946, Medicare: Insolvency Projections, by
Patricia A. Davis.
37 See CRS Report R41196, Medicare Provisions in the Patient Protection and Affordable Care Act (PPACA):
Summary and Timeline
, coordinated by Patricia A. Davis, and CRS General Distribution Memorandum, Estimates of
Medicare Savings in the Patient Protection and Affordable Care Act
, by Patricia A. Davis, August 31, 2012, available
upon request.
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Figure 4. HI Trust Fund Assets at Beginning of Year as a Percentage of Annual
Expenditures
Comparison of Estimates from 2009-2013 Trustees Reports
150%
2009 Estimates
2010 Estimates
130%
2011 Estimates
110%
2012 Estimates
2013 Estimates
90%
70%
50%
30%
10%
-10%

Sources: Data from the 2009 Medicare Trustees Report, Table II.E1, and Summaries of the 2010, 2011, 2012,
and 2013 Annual Reports of the Social Security and Medicare Boards of Trustees, Chart D (2010 and 2011) and
Chart E (2012 and 2013).
Because the impact of the ACA productivity adjustments is relatively modest in the short term,
the expected trust fund exhaustion date provided in the illustrative alternative is the same as that
under the current law scenario, 2026; however, the trust fund is projected to be depleted slightly
earlier in the year.
Long-Range Financial Soundness (75 Years)
For projections beyond 2022, the Medicare trustees do not provide actual dollar figures due to the
difficulty of making meaningful comparisons of dollar values for different time periods over a
long timeframe. Instead, the long-term financial soundness of the Medicare program is generally
determined using one or more of the following measures:
• A comparison of the program’s income and its cost as a percentage of taxable
payroll (how much would need to be added to the payroll tax to keep HI solvent;
this measure is only applicable to the HI trust fund);
• A determination of the present value of the program’s unfunded liabilities over a
particular period (the amount in today’s dollars that would be needed to be in the
trust fund for the program to remain financially sound for a specified period);
and/or
• A comparison of expected benefit costs with GDP, the most frequently used
measure of the total output of the U.S. economy (the amount spent on Medicare
compared to the size of the economy in general).
The trustees caution that while these estimates can provide indications as to whether the trust
funds are in adequate financial condition, financial outcomes are inherently uncertain, especially
over a very long time period.
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HI Income and Costs Relative to Payroll Taxes
The long-range financial soundness of the HI trust fund is often determined by comparing the
fund’s income rate (the ratio of tax income to taxable payroll) with its cost rate (the ratio of
program expenditures to taxable payroll). The term taxable payroll refers to the total amount of
wages, salaries, and self-employment income in the economy that is subject to the HI tax. By
relating income and expenditure projections to expected future taxable payroll, comparisons can
be made for long periods of time without the distortions caused by the changing value of the
dollar (e.g., through inflation). Additionally, it indicates the relative amount of the nation’s
earnings that may be needed to cover the program’s commitments in the future when compared to
what is needed today.
Year-by-Year Estimates
In the past, cost rates have generally increased over time, rising from 0.94% in 1967 to 3.39% in
1996 (see Figure 5). This growth reflects both the higher rate of increase in medical care costs
than in average earnings subject to HI taxes and the higher rate of increase in the number of HI
beneficiaries than in the number of covered workers. Cost rates after that time have fluctuated
primarily due to the passage of legislation affecting Medicare expenditures, including the
Balanced Budget Act of 1997 (P.L. 105-33) and the Medicare Prescription Drug, Improvement,
and Modernization Act of 2003 (MMA, P.L. 108-173), as well as favorable economic
performance. Rates increased again each year from 2008 through 2011 (3.30%, 3.67%, 3.69%
and 3.71%, respectively) due to the lower amount of taxable payroll as a result of the recession
and subsequent slow recovery. Due to a slower growth in spending, the 2012 cost rates decreased
to 3.67%, and the 2013 trustees report projects that in the short-term, due to the expected
economic recovery and changes made by the ACA, the cost rate will continue to decline through
2017. Over the long run however, expenditures as a percentage of taxable payroll are expected to
increase to 5.87% in 2085, primarily due to the aging of the baby boom generation and expected
growth in health care costs. (Under the illustrative alternative, the expected HI cost rate for 2085
is 9.22%, about a third more than the rate projected under current law.)
The HI income rate is projected to increase gradually from 3.18% in 2012 to 4.28% in 2085 due
to ACA’s increase of 0.9% in payroll taxes for high-income earners starting in 2013. As the
income thresholds used to determine who qualifies as “high-income” are not indexed to grow
with inflation, it is expected that more workers will be subject to this higher tax rate over time.
Additionally, it is expected that income from taxation of Social Security benefits will increase as
the number of recipients increases over time. (Because the illustrative alternative only assumes
changes in payments, the income rate is the same as that in the trustees report.)
As indicated earlier, expenditures in most future years are expected to exceed payroll tax income,
resulting in a negative difference between cost and income rates. In 2026, payroll taxes are
expected to cover 87% of HI expenditures, decline to 70% by 2045; and by the end of the 75-year
period, taxes are expected to cover 73% of the expected costs. The decreasing cost rate beyond
2045 is due to the expected compounding of the ACA reductions in provider payment updates and
the assumed slowing of growth in the volume and intensity of services.
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Figure 5. Long-Range HI Income and Cost as a Percentage of Taxable Payroll
7.00%
6.00%
5.00%
4.00%
3.00%
HI Income Rate
HI Cost Rate
2.00%
1.00%
0.00%
1970
1980
1990
2000
2010
2020
2030
2040
2050
2060
2070
2080

Source: Data from Summary of the 2013 Annual Reports of the Social Security and Medicare Boards of
Trustees, Chart B, http://www.ssa.gov/oact/TRSUM/images/LD_ChartB.html.
Note: Rates through 2012 are actual; rates for 2013 and beyond are projections.
The 2013 trustees report estimates that at the end of the 75-year period, there will be an HI deficit
of 1.59% of taxable payroll (see Figure 5).38 Under the illustrative alternative scenario, which
assumes that the ACA productivity adjustments will eventually be phased out, the HI deficit at the
end of the 75-year period is expected to be about 4.94% of taxable payroll.
Actuarial Balance
The actuarial balance can be interpreted as the percentage that would need to be added to the
current-law income rates and/or subtracted from the current-law cost rates in each of the next 75
years in order for the financing to support HI costs and to meet the targeted trust fund balance at
the end of the projection period. The actuarial balance of the HI trust fund is defined as the
difference between the sum of the income rate expected for each year in the 75-year projection
period (including the beginning trust fund balance) and the sum of the cost rates for each year,
expressed as a percentage of taxable income. This summarized rate is based on the present values
of future income, costs, and taxable payroll.
The 2013 trustees report estimates that the summarized HI income rate for the entire 75-year
period is 3.83% of taxable payroll and the summarized cost rate is expected to be 4.94%. The
difference, the actuarial balance, is -1.11%. Because this is a negative number, the HI trust fund
fails to meet the trustees’ long-range test of actuarial balance. This means that the income rate
would need to increase by 1.11% of taxable payroll throughout the next 75 years for the trust fund
to reach actuarial balance (e.g., by increasing the standard payroll tax from 2.90% to 4.01%),
program spending would need to be reduced by a corresponding amount, or some combination of
the two would need to occur. (The trustees note that if no changes in the payroll tax or HI

38 The projected deficit is lower than the deficit of 1.96% in the prior Trustee’s report.
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spending occurs prior to 2026, then the required increase after that time would be 1.44% of
taxable payroll.) If the productivity adjustments to HI provider payment updates cannot be
continued in the long run, the CMS actuaries estimate that the actuarial deficit would be much
higher, 2.17% of taxable payroll, under their illustrative alternative scenario.
Unfunded Obligations
The unfunded obligation is a measure of the long-term funding shortfall of the Medicare program.
It is defined as the difference between the present value of the expected cost of the Medicare
program over a specified time period and the present value of projected income (including the
initial value of the trust fund). Put another way, the unfunded obligation is the amount of money
that would have to be added to the trust fund today to make the program financially sound over a
specified time period.
HI Long-Term Obligations
The 2013 trustees report estimates that the unfunded obligation of the HI trust fund is $4.6 trillion
(0.5% of GDP) over the next 75 years. This means that if $4.6 trillion were added to (or
expenditures reduced from) the trust fund at the beginning of 2013, the program could meet the
projected cost of current-law expenditures over the next 75 years.
The trustees note that limiting the estimates of HI unfunded obligations to 75 years understates
the full magnitude of these obligations because the 75-year measures only reflect the full amount
of taxes paid by the next few generations of workers, but not the full amount of their expected
benefits. Therefore, since 2004, the trustees report has included a measure of unfunded
obligations that extends indefinitely (through infinity). Such extended projections can help
indicate whether the HI financial imbalance would be improving or continuing to worsen beyond
the 75-year period. In making these estimates, the trustees assume that the current-law HI
program, demographic, and economic trends used for the 75-year projection will continue
indefinitely, except that average HI expenditures per beneficiary will increase at the same rate as
GDP per capita less the productivity adjustments beginning in 2087. If the slower ACA price
updates were to continue indefinitely, then the HI financial imbalance actually improves beyond
the 75-year period. Under these assumptions, over the infinite horizon, the HI program is
projected to have a deficit of $3.5 trillion (see Table 2).
Table 2. Unfunded HI Obligations
(Present values as of January 1, 2013)

Present Value
% of GDP
Unfunded obligations through 2087
$4.6 trillion
0.5%
Unfunded obligations through
$3.5 trillion
0.2%
infinite horizon
Source: 2013 Medicare Trustees Report, Table V.G1.

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SMI Long-Term Obligations
Due to its automatic financing provisions, the SMI account is expected to be adequately financed
into the indefinite future; therefore the unfunded obligations are considered to be $0 (see Table
3
). However, estimated SMI expenditures of $30.6 trillion over the next 75 years are expected to
exceed premium revenues and state payments by $22.6 trillion; general fund transfers of this
amount will be needed to keep the SMI trust fund in balance for the next 75 years.39
The estimated present value of Part B expenditures through the infinite horizon is $34.2 trillion,
of which $21.4 trillion would occur during the first 75 years. Approximately 27% of expenditures
for each time period would be financed through beneficiary premiums, and a fraction of a percent
would be financed through fees collected related to brand-name prescription drugs. The
remaining 73% is expected to be paid by general revenues. (However, as noted previously, the
trustees consider Part B expenditures after 2013 to be substantially understated due to the large
physician payment reductions scheduled under current law.) Similarly, the estimated present
value of Part D expenditures through the infinite horizon is $19.3 trillion, of which $9.2 trillion
would occur during the first 75 years. For each time period, approximately 16% of expenditures
would be financed through beneficiary premiums, 9% through state transfers, and the remaining
75% funded by general revenues.
Table 3. Unfunded Part B and Part D Obligations
(Present values as of January 1, 2013; dol ar amounts in tril ions)
SMI—Part B
SMI—Part D

Present Value
% of GDP
Present Value
% of GDP
Unfunded obligations through 2087
$0.0 0.0%
$0.0 0.0%
Expenditures through 2087
$21.4
2.3%
$9.2
1.0%
General Revenue Contributions
15.7
1.7
6.9
0.7
Beneficiary Premiums
5.7
0.6
1.5
0.2
State Transfers


0.9
0.1
Fees related to brand-name drugs
0.1
0.0


Unfunded obligations through
$0.0 0.0%
$0.0 0.0%
infinite horizon
Expenditures through infinite horizon
$34.2
2.2%
$19.3
1.2%
General Revenue Contributions
25.0
1.6
14.4
0.9
Beneficiary Premiums
9.1
0.6
3.1
0.2
State Transfers


1.8
0.1
Fees Related to brand-name drugs
0.1
0.0


Source: 2013 Medicare Trustees Report, Tables V.G3 and V.G5.
Note: Totals may not add due to rounding.

39 These transfers represent a formal budget requirement under current law.
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Medicare Costs as a Percentage of GDP
A comparison of Medicare costs (for Medicare Parts A through D combined) to GDP provides a
measure of the amount of financial resources that will be necessary to pay for Medicare services
relative to the output of the U.S. economy. The rising costs of health services, increasing
utilization rates, and anticipated increases in the complexity of services are expected to contribute
to the rising costs of Medicare relative to GDP. Additionally, it is expected that as increasing
numbers of people become eligible for Medicare, there will be a significant growth in benefit
expenditures. Under current law, the trustees expect Medicare costs to increase from 3.6% in
2012 to 5.8% of GDP in 2040 and to 6.5% in 2087. Under the illustrative alternative, similar to
estimates made under the law prior to ACA, projected Medicare costs are expected to represent
about 9.8% of GDP in 2087. (See Appendix G for a comparison of projections of Medicare
expenditures as a percentage of GDP from the 2009 through 2013 trustees reports.)
Over the next 75 years, general revenues and beneficiary premiums are expected to play an
increasing role in financing the program. Figure 6 shows actual and projected expenditures and
non-interest revenues for HI and SMI combined as a percentage of GDP.
Figure 6. Medicare Cost and Non-Interest Income by Source as a Percentage of GDP

Source: Summary of the 2013 Annual Reports of the Social Security and Medicare Boards of Trustees,
http://ssa.gov/oact/TRSUM/index.html, Chart C.
General revenue transfers to the SMI trust fund are projected to increase from 1.5% of GDP in
2013 to 2.9% in 2087, and beneficiary premiums from 0.5% of GDP in 2013 to 1.0% in 2087. As
shown, the share of Medicare income from payroll taxes and taxation of benefits is expected to
fall substantially during that period (from 41% to 30%), while the share of general fund revenue
is expected to rise (from 43% to 50%) as are premiums (from 14% to 17%). Any excess in
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projected spending over revenues represents the HI deficit; in 2087, the HI deficit is projected to
represent 0.7% of GDP.
Medicare Funding Warning (“Medicare Trigger”)40
As noted, HI and SMI are financed very differently. HI is funded by current workers through a
payroll tax, while SMI is funded by premiums from current beneficiaries and federal general
revenues. Because of this financing, the SMI trust fund’s income is projected to equal
expenditures for all future years. However, there is concern that over time the economy will be
unable to support the increasing reliance on general revenues which in large measure comes from
taxes paid by the under-65 population. In response, the Medicare Prescription Drug,
Improvement, and Modernization Act of 2003 (MMA, P.L. 108-173) required the trustees report
to include an expanded analysis of Medicare expenditures and revenues. Specifically, a
determination must be made as to whether general revenue financing will exceed 45% of total
Medicare outlays within the next seven years (on a fiscal year basis).41 The law specifies that if an
excess general revenue funding determination is made for two successive years, a “Medicare
funding warning” is triggered, and the President is to submit a legislative proposal to respond to
the warning. The Congress is required to consider the proposals on an expedited basis; however,
passage of legislation within a specific time frame is not required.
In each report issued from 2006 through 2012, the Medicare trustees made a determination of
excess general revenue funding. The 2013 report, again, made such a determination, projecting
that general revenue funding would exceed 45% in FY2013.42 This represents the eighth
consecutive time that the threshold was estimated to be exceeded within the first seven years of
the projection, and the seventh time that the trustees have issued a funding warning.
Proponents of the 45% threshold measurement believe that it can serve as an effective early
warning system and that it forces fiscal responsibility. Opponents of the measure suggest that it
doesn’t adequately recognize a shift towards the provision of more services on an outpatient basis
or the impact of the Part D program on general revenue increases, and that other measures, such
as Medicare spending as a percentage of GDP, Medicare spending as a portion of total federal
spending, or the number of workers subject to payroll taxes per Medicare beneficiary, are better
ways to measure the health of the Medicare program. On January 6, 2009, the House approved a
rules package (H.Res. 5) that nullified the trigger provision for the 111th Congress.43 Neither the
112th nor the 113th Congress have passed a similar measure; therefore, the trigger provision is in
effect in the House. To date, no legislation has been enacted to specifically respond to these
funding warnings.

40 For additional information, see CRS Report RS22796, Medicare Trigger, by Patricia A. Davis, Todd Garvey, and
Christopher M. Davis.
41 Under the Trigger formula, general revenue funding is defined slightly differently. The main difference is that after
the assets in the HI trust fund are depleted, HI deficits are included in the general revenue funding measure when
determining whether the 45% threshold has been exceeded.
42 The Trustees estimate that additional revenues of at least $10 billion or expenditure reductions of at least $18 billion
(or some combination of the two) would be needed to reduce the ratio below 45% in 2013.
43 H.Res. 5 declared that the accelerated legislative procedures required by MMA for a presidential legislative proposal
in response to a Medicare funding warning would not apply during the 111th Congress.
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Medicare Expenditures and the Federal Budget
By law, the annual Medicare trustees reports focus on the financial status of the Medicare HI and
SMI trust funds. Trust fund accounting methods are used to determine whether dedicated sources
of Medicare revenue, together with any asset balances, are sufficient to allow the payment of
expected expenditures on a timely basis. In contrast, when examining Medicare finances under
unified budget accounting methods, the total flow of money into and out of the U.S. Treasury is
typically examined regardless of the source of revenue.44
The expected shortfall in payroll taxes needed to fully cover HI expenses and the rapid growth of
SMI, which relies primarily on general revenues for financing, have made it increasingly
important to look at Medicare expenditures from the perspective of the federal budget as a whole.
To illustrate, over the next 75 years, revenues from payroll taxes are projected to fall short of HI
expenditures by $4.8 trillion in present value terms. This is the additional amount that is expected
to be needed in order to pay HI benefits at the level expected under current law over the next 75
years. Note that the federal liability from a budget perspective includes the beginning
accumulated assets in the HI trust fund ($0.2 trillion, as of January 1, 2013) as they represent
federal payment obligations.45
Additionally, general revenue transfers in present value terms of $22.6 trillion are expected to be
needed to cover SMI expenditures (Parts B and D combined) over the next 75 years.46 The
Medicare trustees estimate that, assuming personal and corporate income taxes in the future
maintain their historical average level relative to the national economy, the portion of income
taxes that will be needed to fund the general revenue portion of SMI will grow from 13.4% in
2013 to 25.6% in 2080 (see Table 4).47
Table 4. SMI General Revenues as a Percentage of Personal and Corporate Federal
Income Taxes
Comparison of Estimates of the 2009 - 2013 Medicare Trustees Reports
Percentage of
Percentage of
Percentage of
Percentage of
Percentage of
Income Taxes Income Taxes
Income Taxes
Income Taxes
Income Taxes
Fiscal Year
2009 Report
2010 Report
2011 Report
2012 Report
2013 Report
Historical





1970
0.8% 0.8% 0.8% 0.8% 0.8%
1980
2.2 2.2 2.2 2.2 2.2
1990
5.9 5.9 5.9 5.9 5.9
2000
5.4 5.4 5.4 5.4 5.4

44 Spending is normally categorized either as mandatory (not subject to the appropriations process) or discretionary
(must be appropriated). Medicare benefit spending is mandatory, while some administrative costs are discretionary.
45 The net 75-year unfunded liability from the trust fund perspective of $4.6 trillion in present value terms, does not
include the trust fund assets. See “Unfunded Obligations.”
46 This amount could be substantially higher if Congress modifies the physician payment system to eliminate scheduled
payment reductions.
47 This amount is in addition to the HI payroll tax.
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Percentage of
Percentage of
Percentage of
Percentage of
Percentage of
Income Taxes Income Taxes
Income Taxes
Income Taxes
Income Taxes
Fiscal Year
2009 Report
2010 Report
2011 Report
2012 Report
2013 Report
2008
10.9 12.0 12.0 12.0 12.0
2009
n/a 17.7 17.7 17.7 17.7
2010
12.2 18.6 19.2 19.2 19.2
2011 n/a
n/a
18.0
17.2
17.2
2012 n/a
n/a
n/a
14.4
14.5
Intermediate





Estimates
2013
n/a n/a n/a n/a 13.4
2020
15.8 15.0 17.1 16.3 15.3
2030
24.0 19.5 19.9 18.6 19.2
2040
28.9 21.8 22.1 22.6 22.4
2050
31.9 22.7 23.0 23.0 23.0
2060
35.1 24.6 24.7 24.0 24.0
2070
38.1 25.7 25.7 25.0 25.1
2080
40.5 26.6 26.3 25.7 25.6
Source: 2009 - 2013 Medicare Trustees Reports, Table III.C4 (2009-2011) and Table II.F3 (2012 and 2013).
Note: Includes the Part D prescription drug benefit beginning in 2006; n/a = not available.
ACA and Medicare Spending
As noted earlier, ACA contains numerous provisions that are expected to reduce Medicare
spending growth (both HI and SMI) in future years.48 The ACA did not reduce beneficiaries’
Medicare covered benefits or change Medicare’s financing structure. Medicare is still funded
primarily through mandatory spending, and aside from certain constraints in HI, there are still
generally no limits on Medicare spending. The ACA mainly changes the way that payments are
made to healthcare providers who provide services to Medicare beneficiaries. Because of these
changes, Medicare expenditures are expected to be less than they would have been under prior
law, but spending is not limited to those amounts. Actual benefit spending could be greater or less
than projections depending on a variety of factors, including beneficiary health care needs and
their utilization of services in a given year. As shown in Figure 2, Medicare spending is still
expected to increase in the future, just not as quickly as projected under prior law. As Medicare is
not “pre-funded,” these expected “savings” are neither cut from, nor credited to, the Medicare
trust funds.49 The expected reduction in future Medicare spending mainly just means that the

48 For a summary of savings estimates of Medicare ACA provisions, see CRS General Distribution Memorandum,
Estimates of Medicare Savings in the Patient Protection and Affordable Care Act, by Patricia A. Davis, August 31,
2012, available upon request.
49 Certain ACA revenue changes, i.e., increased Medicare payroll taxes for high-income workers, and fees paid by
brand name drug and medical device manufacturers are, however, specifically credited to the Medicare trust funds. For
additional detail, see archived CRS Report R41128, Health-Related Revenue Provisions in the Patient Protection and
Affordable Care Act (ACA)
.
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federal government and Medicare beneficiaries are expected to spend less on Medicare than they
would have under prior law.50
Concluding Observations
As shown in this report, a wide array of measures can be used to describe the short- and long-
term financial status of the Medicare program. While trust fund solvency issues are important,
they only present part of the picture. When viewed from the perspective of the entire federal
budget and the economy, Medicare spending obligations, even under the more optimistic scenario
presented in the 2013 Medicare trustees report, are expected to consume an increasing portion of
federal budgetary resources over time. Budget experts have expressed concern about the long-run
implications of Medicare expenditures on federal deficits; for example, in its long-term budget
forecast, CBO noted:
The aging of the baby-boom generation, together with growth in health care spending per
person and an expansion of federal subsidies for health insurance, is expected to steadily
boost the government’s spending for Social Security and major health care programs.
Barring changes to current law, that additional spending would contribute to rising budget
deficits starting in a few years, causing federal debt to swell from a level that is already very
high relative to the size of the economy.51
The Medicare trustees caution that it is difficult to forecast health and economic indicators over
an extended period of time. For example, forecasts are based on the assumption that health
spending will outpace GDP growth in the future because it has consistently done so in the past. It
is possible that in the future, advances in medical technology, changes in consumer preferences,
shifts in the health status of the population, or changes in the way health care services are
delivered could result in very different financial outcomes from those estimated in the trustees
report.52 Further, as evidenced by the issuance of an illustrative alternative to the 2013 trustees
report, if changes to current health care policies are enacted (most notably these affecting
physician reimbursement or productivity adjustments), future Medicare costs could be
significantly different from current projections.
There are no simple solutions to address the problems raised by the rapid growth in health care
costs, the economic conditions, and the aging of the population. Additionally, as an entitlement
program, Medicare must pay for all medically necessary covered benefits for enrollees; except for
constraints placed on the program by the HI financing mechanism, there are no limits on overall

50 Therefore, it would not be correct to conclude that “Medicare savings” are being diverted to other purposes. The
perception that Medicare spending reductions are “paying for” new entitlements mainly stems from the provisions
being in the same legislation, and because Medicare savings estimates were used as an offset of estimates of increased
costs in ACA to meet legislative PAYGO rules at a particular point in time. For illustration purposes, if the Medicare
savings provisions had been in one bill that was passed at one time, and the rest of the ACA had been in another bill
that passed at a different time, then it would be clearer that one is not directly funding the other. See CRS Report
R41510, Budget Enforcement Procedures: House Pay-As-You-Go (PAYGO) Rule, and CRS Report RL31943, Budget
Enforcement Procedures: Senate Pay-As-You-Go (PAYGO) Rule
, both by Bill Heniff Jr.
51 “The 2013 Long-Term Budget Outlook,” Congressional Budget Office, September 2013, p. 7, http://www.cbo.gov/
sites/default/files/cbofiles/attachments/44521-LTBO_0.pdf.
52 For example, information learned from pilot programs and demonstrations mandated by recent legislation, such as
changing financial incentives of health care providers and improving the care coordination of beneficiaries with chronic
conditions, could lead to long-term changes in how health care is delivered and in the cost of that care.
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Medicare spending. As such, policy options to restrain the growth of Medicare spending will
continue to attract considerable interest.
Proposals to reduce Medicare spending generally fall into one of two categories: (1) those that
would reduce the federal share of Medicare spending (for example, by increasing beneficiary
premiums and/or cost-sharing; changing Medicare eligibility criteria such as age; reducing the
range of covered benefits; establishing defined federal contributions;53 or setting federal spending
limits), and (2) those that would reduce the total amount of health care spending regardless of
who is paying (e.g., reducing prices paid for items and services;54 decreasing medical errors;
reducing unneeded, duplicative and/or ineffective care; and eliminating fraud and abuse). On the
revenue side, options to increase program income may include modifying dedicated Medicare
payroll taxes or general income taxes, and/or imposing new fees or dedicated taxes.55 Some of the
above changes could be made while still retaining Medicare’s current structure, while others
could only be made in the context of major program restructuring. Many of the proposals could
be combined as part of an overall reform package.
The challenge to policy makers will be to slow the growth in Medicare spending over the long-
term, to establish fair levels of contributions from beneficiaries and taxpayers, and to ensure
continued beneficiary access to needed health care services. The Medicare trustees suggest that
prompt action is needed to address both the short- and the long-range financial challenges of the
Medicare program; the sooner that solutions can be enacted, the more flexible these solutions can
be, and the more gradually they may be phased in.

53 See CRS Report R43017, Overview of Health Care Changes in the FY2014 Budget Proposal Offered by House
Budget Committee Chairman Ryan
, by Patricia A. Davis, Alison Mitchell, and Bernadette Fernandez for a description
of the premium support model proposed in the House FY2014 budget.
54 Some may argue that reducing prices for some payers, such as Medicare, can lead to shifting costs to other payers,
such as private insurers, and thus not decrease the overall cost of health care.
55 Additionally, broadening the tax base through increased levels of employment and/or wages (e.g., through economic
recovery) would also result in increased Medicare payroll tax income.
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Appendix A. Medicare Enrollment
Table A-1. Medicare Enrollment, 1970 - 2085
(in thousands)
Year
HI—Part A
SMI—Part B
SMI—Part D
Part C
Total
Historical
1970
20,104
19,496


20,398
1975
24,481
23,744


24,864
1980
28,002
27,278


28,433
1985
30,621
29,869

1,271
31,081
1990
33,747
32,567

2,017
34,251
1995
37,175
35,641

3,467
37,594
2000
39,257
37,335

6,856
39,688
2005
42,233
39,752
1,841
5,794
42,606
2006
43,065
40,361
30,560
7,291
43,436
2007
44,010
41,093
31,392
8,667
44,368
2008
45,150
41,975
32,589
10,010
45,500
2009
46,256
42,908
33,644
11,104
46,604
2010
47,365
43,882
34,772
11,692
47,720
2011
48,528
44,906
35,720
12,382
48,884
2012
50,298
46,405
37,367
13,586
50,655
Estimated
2013
51,939
47,982
38,906
14,837
52,294
2014
53,608
49,459
40,063
15,562
53,961
2015
55,276
50,924
41,140
15,439
55,629
2016
56,938
52,390
42,256
15,010
57,289
2017
58,636
53,883
43,475
14,260
58,987
2018
60,362
55,404
44,709
14,156
60,713
2019
62,118
56,958
45,969
14,549
62,469
2020
63,919
58,611
47,420
15,117
64,272
2021
65,751
60,247
48,694
15,842
66,105
2022
67,619
61,921
50,057
16,617
67,975
2025
73,164
66,903
54,144
18,402
73,526
2030
81,111
74,090
60,003
20,343
81,482
2035
86,106
78,539
63,683
21,554
86,479
2040
88,519
80,770
65,459
a 88,891

2045
89,978
82,070
66,536
a 90,353

2050
92,003
83,918
68,032
a 92,385

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Year
HI—Part A
SMI—Part B
SMI—Part D
Part C
Total
2055
94,679
86,323
70,011
a
95,073
2060
98,152
89,512
72,582
a
98,563
2065
101,701
92,734
75,208
a
102,130
2070
105,597
96,286
78,092
a
106,046
2075
109,486
99,867
80,972
a
109,957
2080
112,114
102,257
82,919
a
112,601
2085
115,914
105,702
85,733
a
116,422
Source: 2013 Medicare Trustees Report, Table V.B4.
a. The trustees report did not provide enrol ment projections separately for Part C beyond 2035.
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Appendix B. Total Medicare Income and
Expenditures (HI and SMI Combined)

Table B-1. Medicare Income and Expenditures,
Calendar Years 1970-2022
($ in billions)
Income
Expenditures
Payroll
General
State
Interest
Benefit
Admin.
Year
Taxes
Revenue Premiums Transfers
& Other
Total
Payments
Expenses
Total
Historical Data
1970
$4.9
$1.1
$1.1

$1.2
$8.2
$7.1
$0.4
$7.5
1975
11.5
2.6
1.9

1.5
17.7
15.6
0.8
16.3
1980
23.8
7.5
3.0

2.5
37.0
35.7
1.1
36.8
1985
47.6
18.3
5.6

5.1
76.5
70.5
1.7
72.3
1990
72.0
33.0
11.4

9.9
126.3
108.7
2.3
111.0
1995
98.4
39.0
20.7

17.3
175.3
181.4
2.8
184.2
2000
144.4
65.9
22.0

24.9
257.1
217.4
4.4
221.8
2005
171.4
119.2
39.9

27.0
357.5
330.3
6.1
336.4
2006
181.3
171.9
49.0
$5.5
29.4
437.0
402.0
6.3
408.3
2007
191.9
178.4
53.7
6.9
31.3
462.1
425.4
6.3
431.7
2008
198.7
184.1
58.1
7.1
32.7
480.8
461.6
6.6
468.2
2009
190.9
209.9
65.2
7.6
34.7
508.3
502.4
6.6
509.0
2010
182.0
204.6
61.8
4.0
33.6
486.1
515.9
7.1
522.9
2011
195.6
222.8
68.5
7.1
36.0
530.0
541.3
7.8
549.1
2012
205.7
213.9
69.7
8.4
39.1
536.9
565.9
8.2
574.2
Intermediate Estimate
2013
216.5
239.0
77.0
8.6
33.8
574.9
586.4
7.6
594.0
2014
230.4
257.9
79.6
8.7
37.2
614.0
604.2
8.1
612.2
2015
248.4
286.1
90.0
9.0
41.4
674.9
632.1
8.9
641.0
2016
266.5
290.1
92.8
9.6
46.3
705.3
674.9
9.8
684.8
2017
284.9
318.4
105.6
10.3
52.4
771.6
723.5
11.0
734.5
2018
303.2
343.4
116.2
11.1
58.1
831.9
782.5
12.0
794.4
2019
319.7
371.8
127.0
11.9
63.6
894.0
840.5
12.8
853.4
2020
335.5
418.1
139.6
13.0
69.3
975.4
908.2
13.7
921.9
2021
352.0
431.9
143.0
14.2
76.2 1,017.3
979.7
14.8
994.5
2022
368.4
486.0
162.1
15.5
81.5 1,113.4
1,071.4
16.3 1,087.7
Source: Data from 2013 Medicare Trustees Report, Tables III.B4, III.C4, III.D3 and VB1.
Notes: Totals do not necessarily equal the sums of rounded components.
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Appendix C. Medicare Per Capita Expenditures
Table C-1. Average Medicare Benefit Costs Per Beneficiary,
Calendar Years 1970-2022
SMI
Year HI Part B
Part D
Total
Historical Data
1970
$255
$101

$356
1975
462
180

642
1980
895
390

1,285
1985
1,554
768

2,322
1990
1,963
1,304

3,267
1995
3,130
1,823

4,953
2000
3,272
2,381

5,653
2005
4,262
3,754

8,016
2006
4,388
4,111
$1,708
10,208
2007
4,548
4,293
1,556
10,397
2008
5,145
4,296
1,504
10,945
2009
5,172
4,721
1,798
11,692
2010
5,161
4,779
1,775
11,715
2011
5,212
4,938
1,868
12,019
2012
5,227
5,097
1,779
12,103
Intermediate Estimates
2013
5,134
5,155
1,846
12,135
2014
5,057
5,049
2,077
12,183
2015
5,048
5,184
2,165
12,396
2016
5,202
5,401
2,267
12,870
2017
5,369
5,639
2,412
13,420
2018
5,621
5,932
2,562
14,115
2019
5,815
6,221
2,720
14,755
2020
6,045
6,553
2,904
15,502
2021
6,297
6,901
3,079
16,276
2022
6,643
7,392
3,287
17,322
Source: 2013 Report of Medicare Trustees, Table V.D1.
Notes: These amounts do not include administrative costs. The expenditure figures do not net out premiums
and state transfers.
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Appendix D. Operation of the Hospital Insurance
Trust Fund

Table D-1. Operation of the Hospital Insurance Trust Fund,
Calendar Years 1970-2022
($ in billions)
Income
Expenditures
Trust Fund
Interest,
Payroll
Transfers,
Benefit
Admin.
Net
Balance at
Year
Taxes
Other Total
Payments
Expenses Total Change
End of Year
Historical Data
1970 $4.9
$1.2
$6.0
$5.1
$0.2
$5.3
$0.7
$3.2
1975 11.5
1.4
13.0
11.3
0.3
11.6
1.4
10.5
1980 23.8
2.1
26.1
25.1
0.5
25.6
0.5
13.7
1985 47.6
3.9
51.4
47.6
0.8
48.4
4.8
20.5
1990 72.0
8.4
80.4
66.2
0.8
67.0
13.4
98.9
1995 98.4
16.7
115.0
116.4
1.2
117.6
-2.6
130.3
2000 144.4
22.9
167.2
128.5
2.6
131.1
36.1
177.5
2005 171.4
28.0
199.4
180.0
2.9
182.9
16.4
285.8
2006 181.3
30.2
211.5
189.0
2.9
191.9
19.6
305.4
2007 191.9
31.9
223.7
200.2
2.9
203.1
20.7
326.0
2008 198.7
32.0
230.8
232.3
3.3
235.6
-4.7
321.3
2009 190.9
34.5
225.4
239.3
3.2
242.5
-17.1
304.2
2010 182.0
33.6
215.6
244.5
3.5
247.9
-32.3
271.9
2011 195.6
33.4
228.9
252.9
3.8
256.7
-27.7
244.2
2012 205.7
37.3
243.0
262.9
3.9
266.8
-23.8
220.4
Intermediate Estimate
2013 216.5
31.8
248.2
266.6
3.9
270.5
-22.2
198.1
2014 230.4
34.6
265.1
271.1
4.2
275.2
-10.2
188.0
2015 248.4
38.0
286.4
279.0
4.6
283.6
2.8
190.8
2016 266.5
41.7
308.2
296.2
5.1
301.3
6.9
197.7
2017 284.9
45.5
330.4
314.8
5.7
320.5
9.9
207.6
2018 303.2
49.6
352.8
339.3
6.2
345.5
7.3
214.9
2019 319.7
54.7
374.3
361.2
6.7
367.9
6.4
221.3
2020 335.5
58.5
393.9
386.4
7.2
393.6
0.3
221.6
2021 352.0
63.2
415.1
414.0
7.7
421.8
-6.7
215.0
2022 368.4
66.2
434.6
449.2
8.5
457.7
-23.1
191.8
Source: 2013 Medicare Trustees Report, Table III.B4.
Notes: Sums may not equal totals due to rounding.
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Appendix E. Operation of the Supplementary
Insurance Trust Fund, Part B Account

Table E-1. Operation of the Part B Account of the SMI Trust Fund,
Calendar Years 1970-2022
($ in billions)
Income
Expenditures
Trust Fund
General
Interest
Benefit
Admin.
Net
Balance at
Year Premiums Revenue
& Other
Total
Payments Expenses Total
Change
End of Year
Historical Data
1970 $1.1
$1.1
$0.0
$2.2 $2.0
$0.2
$2.2
-$0.0 $0.2
1975 1.9
2.6
0.1
4.7 4.3
0.5
4.7
-0.1 1.4
1980 3.0
7.5
0.4
10.9
10.6
0.6
11.2
-0.4 4.5
1985 5.6
18.3
1.2
25.1
22.9
0.9
23.9 1.2 10.9
1990 11.3
33.0 1.6
45.9 42.5 1.5
44.0 1.9 15.5
1995 19.7
39.0 1.6
60.3 65.0 1.6
66.6 -6.3 13.1
2000 20.6
65.9 3.4
89.9 88.9 1.8
90.7 -0.8 44.0
2005 37.5
118.1 1.4
157.0
149.2 3.2
152.4 4.6 24.0
2006 42.9
132.7 1.8
177.3
165.9 3.1
169.0 8.3 32.3
2007 46.8
139.6 2.2
188.7
176.4 2.5
178.9 9.7 42.1
2008 50.2
146.8 3.6
200.6
180.3 3.0
183.3 17.3 59.4
2009 56.0
162.8 3.1
221.9
202.6 3.1
205.7 16.2 75.5
2010 52.0
153.5 3.3
208.8
209.7 3.2
212.9 -4.1 71.4
2011 57.5
170.2 5.9
233.6
221.7 3.6
225.3 8.3 79.7
2012
58.0
163.8
5.2
227.0
236.5
3.9
240.5
−13.5
66.2
Intermediate Estimates
2013
63.6
185.6
5.5
254.7
248.0
3.3
251.3
3.5
69.7
2014
64.6
194.6
6.0
265.3
249.9
3.5
253.4
11.9
81.6
2015
73.0
219.1
6.9
299.0
264.0
3.9
267.9
31.1
112.7
2016
74.5
218.0
8.3
300.8
282.9
4.3
287.3
13.5
126.2
2017
85.2
239.8
10.8
335.7
303.8
4.8
308.6
27.1
153.3
2018
93.7
257.7
12.7
364.0
328.6
5.3
333.9
30.1
183.4
2019
102.3
278.4
13.3
394.0
354.3
5.6
360.0
34.1
217.5
2020
112.4
315.3
15.5
443.2
384.1
6.0
390.1
53.1
270.5
2021
114.2
319.4
18.0
451.6
415.8
6.5
422.2
29.4
299.9
2022
130.1
362.8
20.7
513.6
457.7
7.2
464.9
48.7
348.6
Source: 2013 Medicare Trustees Report, Table III.C4.
Notes: Sums may not equal totals due to rounding.
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Medicare Financing

Appendix F. Operation of the Supplementary
Insurance Trust Fund, Part D Account

Table F-1. Operation of the Part D Account in the SMI Trust Fund,
Calendar Years 2004-2022
($ in billions)
Income
Expenditures
Trust Fund
Transfers
Balance
General
from
Benefit
Admin.
Net
at End
Year
Premiums Revenue
States Total
Payments Expenses Total Change
of Year
Historical Data
2004 —
$0.4

$0.4
$0.4

$0.4


2005 —
1.1

1.1
1.1

1.1
0
0
2006 $3.5
39.2
$5.5
48.2
47.1
$0.3
47.4
$0.8
$0.8
2007 4.1
38.8
6.9
49.7
48.8
0.9
49.7
0.0
0.8
2008 5.0
37.3
7.1
49.4
49.0
0.3
49.3
0.1
0.9
2009 6.3
47.1
7.6
61.0
60.5
0.3
60.8
0.1
1.1
2010 6.5
51.1
4.0
61.7
61.7
0.4
62.1
-0.4
0.7
2011 7.7
52.6
7.1
67.4
66.7
0.4
67.1
0.3
1.0
2012
8.3
50.1
8.4
66.9
66.5
0.4
66.9
0.0
1.0
Intermediate Estimates
2013
9.9
53.4
8.6
71.9
71.8
0.4
72.2
−0.3
0.7
2014
11.6
63.3
8.7
83.6
83.2
0.4
83.6
0.0
0.7
2015
13.5
67.0
9.0
89.5
89.1
0.4
89.5
0.0
0.8
2016
14.6
72.1
9.6
96.3
95.8
0.4
96.3
0.1
0.8
2017
16.5
78.6
10.3
105.4
104.9
0.5
105.3
0.1
0.9
2018
18.3
85.7
11.1
115.1
114.6
0.5
115.0
0.1
0.9
2019
20.3
93.4
11.9
125.6
125.0
0.5
125.5
0.1
1.0
2020
22.5
102.8
13.0
138.3
137.7
0.5
138.2
0.1
1.1
2021
23.8
112.5
14.2
150.6
149.9
0.6
150.5
0.1
1.2
2022
26.6
123.2
15.5
165.2
164.5
0.6
165.1
0.1
1.3
Source: 2013 Medicare Trustees Report, Table III.D3.
Notes: Sums may not equal totals due to rounding.
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Appendix G. Medicare Expenditures as a Percentage of GDP
Table G-1. Projected HI and SMI Expenditures as a Percentage of GDP
Comparison of 2009 - 2013 Medicare Trustees Report Estimates
HI
SMI-B
SMI-D
Total Medicare
2009
2010
2011
2012
2013
2009
2010
2011
2012
2013
2009
2010
2011
2012
2013
2009
2010
2011
2012
2013
Year Report Report Report Report Report Report Report Report Report Report Report Report Report Report Report Report Report Report Report Report
2009 1.71% 1.67% 1.67% 1.70% 1.69
1.44% 1.45% 1.46% 1.48% 1.47
0.43% 0.41% 0.41% 0.42% 0.42
3.59% 3.53% 3.54% 3.59% 3.58

2010
1.71 1.66 1.69 1.68 1.68
1.38 1.49 1.46 1.48 1.48
0.45 0.43 0.43 0.43 0.43
3.54 3.59 3.58 3.59 3.59

2020
2.05 1.63 1.70 1.70 1.64
1.76 1.61 1.63 1.65 1.65
0.71 0.67 0.67 0.61 0.58
4.53 3.91 3.99 3.96 3.88

2030
2.75 1.99 2.03 2.16 2.06
2.30 2.10 2.15 2.25 2.25
1.08 1.02 0.98 0.88 0.83
6.43 5.11 5.16 5.29 5.14

2040
3.43 2.24 2.27 2.53 2.37
3.15 2.30 2.34 2.42 2.45
1.28 1.21 1.15 1.02 0.97
7.96 5.76 5.77 5.97 5.79

2050
3.85 2.27 2.30 2.62 2.46
3.47 2.33 2.36 2.41 2.45
1.42 1.35 1.28 1.11 1.07
8.74 5.94 5.94 6.15 5.98

2060
4.21 2.23 2.26 2.63 2.47
3.82 2.39 2.40 2.45 2.50
1.57 1.50 1.42 1.23 1.18
9.60 6.12 6.09 6.31 6.15

2070
4.61 2.21 2.24 2.70 2.54
4.16 2.45 2.44 2.50 2.56
1.69 1.63 1.55 1.35 1.29
10.46 6.29 6.22 6.55 6.40

2080
4.96 2.17 2.16 2.73 2.56
4.43 2.47 2.43 2.52 2.56
1.80 1.75 1.66 1.45 1.38
11.18 6.37 6.25 6.69 6.50

Sources: 2009 - 2013 Reports of the Medicare Trustees, Table III.A2 (2009-2011), Table V.B2 (2012), and Table V.B3 (2013).






CRS-31

Medicare Financing

Author Contact Information

Patricia A. Davis

Specialist in Health Care Financing
pdavis@crs.loc.gov, 7-7362

Congressional Research Service
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