Order Code RS20946
Updated March 28, 2008
Medicare: History of Part A Trust Fund
Insolvency Projections
Jennifer O’Sullivan
Specialist in Health Care Financing
Domestic Social Policy Division
Summary
Medicare is the nation’s health insurance program for persons age 65 and older and
certain disabled persons. Medicare consists of four distinct parts: Part A (Hospital
Insurance, or HI); Part B (Supplementary Medical Insurance, or SMI); Part C (Medicare
Advantage, or MA); and Part D (the new prescription drug benefit added by the
Medicare, Prescription Drug, and Modernization Act of 2003, or MMA). 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 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 and beneficiary premiums. The HI and SMI
trust funds are overseen by a board of trustees that makes an annual report to Congress
concerning their financial status.
Almost from its inception, the HI trust fund has faced a projected shortfall. The
insolvency date has been postponed a number of times, primarily due to legislative
changes which had the effect of restraining growth in program spending. The 2008
report projects that, under intermediate assumptions, the HI trust fund will become
insolvent in 2019, the same year projected in the 2007 report. The 2007 projection is
seven years earlier than that projected in 2003, prior to the enactment of MMA. That
law added to HI costs, primarily through higher payments to rural hospitals and to
private plans under the MA program. This report is a supplement to CRS Report
RS20173, Medicare: Financing the Part A Hospital Insurance Program, by Jennifer
O’Sullivan. That report discusses the findings from the 2008 trustees’ report. Both
reports will be updated upon receipt of the trustees’ 2009 report.

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Health Insurance (Part A) Trust Fund
Medicare consists of four distinct parts: Part A (Hospital Insurance [HI]); Part B
(Supplementary Medical Insurance [SMI]); Part C (Medicare Advantage [MA]); and Part
D (the new prescription drug benefit added by the Medicare, Prescription Drug, and
Modernization Act of 2003 [MMA, P.L. 108-173]). 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. Financial operations
for Part A are accounted for through the HI trust fund while those for Part B (and Part D)
are accounted for through the SMI trust fund. Both funds are maintained by the
Department of the Treasury.1 Each fund is overseen by a board of trustees that reports
annually to Congress concerning the funds’ financial status.
Almost from its inception, the HI trust fund has faced a projected shortfall. When
observers refer to the impending insolvency of Medicare they are actually referring to the
pending insolvency of the HI trust fund. The SMI trust fund does not face exhaustion
because of the way it is financed. However, the SMI trustees continue to voice concern
about the rapid growth in program costs.
Part A Projections
The board of trustees projected insolvency for the HI fund beginning with the 1970
report (which was less than four years after the program went into effect). The insolvency
date was postponed a number of times, primarily due to legislative changes which had the
effect of restraining the growth in program spending. (see Table 1) The lower growth
rates were achieved largely through reductions in payments to providers, primarily
hospitals and physicians. Generally, these measures were part of larger budget
reconciliation laws which attempted to restrain overall federal spending.
Efforts to curtail program spending intensified as Congress considered legislation
to bring the entire federal budget into balance and culminated in the passage of the
Balanced Budget Act of 1997 (BBA 97, P.L. 105-33). This legislation achieved
significant savings in Medicare and extended the solvency of the Part A trust fund. A
number of observers contended that the savings achieved through the enactment of BBA
97 were greater than intended at the time of enactment and had unintended consequences
for health care providers. As a result of these concerns, Congress subsequently enacted
two measures (the Balanced Budget Refinement Act of 1999 [BBRA 99, P.L. 106-113]
and the Medicare, Medicaid, and SCHIP Benefits Improvement and Protection Act of
2000 [BIPA 2000, P.L. 106-554]). These measures were designed to restore some of the
BBA 97 spending reductions.
In early 1997, the trustees had projected that the Part A fund would become insolvent
in 2001. Following enactment of BBA 97, significant improvements were recorded in the
short-term projections. The new projections reflected a number of factors including BBA
97 and strong economic growth which generated more revenues to the trust fund from
1 The trust funds are an accounting mechanism; there is no actual transfer of money into and out
of the fund.

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payroll taxes. Despite enactment of both BBRA 99 and BIPA 2000, which increased
program spending, the 2001 and 2002 trustees’ reports continued to delay the projected
insolvency date. However, the 2003 report shifted direction again. Its projected
insolvency date was 2026, four years earlier than the 2030 date projected in the 2002
report. The revision was due to lower than expected HI-taxable payroll and higher than
expected hospital expenditures.
The 2004 report projected that, under intermediate assumptions, the HI trust fund
would become insolvent in 2019, seven years earlier than projected in 2003. The revision
of the projected insolvency date was due to a number of factors including slow wage
growth (on which payroll taxes are based) and faster growth in inpatient hospital benefits.
The enactment of MMA added significantly to HI costs, primarily through higher
payments to rural hospitals and to private plans under the MA program.
The 2005 report projected that, under intermediate assumptions, the HI trust fund
would become insolvent in 2020, one year later than projected in 2004. The revision
reflected slightly higher income and slightly lower costs in 2004 than previously
estimated. The 2006 report moved the insolvency date forward again. Under the trustees’
intermediate assumptions, the HI trust fund would become insolvent in 2018. The
revision reflected slightly higher costs and an upward revision in short-range assumptions
about utilization of HI services.
Both the 2007 and 2008 reports project a 2019 insolvency date, though the 2008
report indicates it would occur earlier in the year.

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Table 1. Year in Which the Hospital Insurance Trust Fund Was
Projected to Become Insolvent in Past Trustees’ Reports
Year of
Year of
Year of
Year of
Year of
Year of
trustees’
trustees’
trustees’
insolvency
insolvency
insolvency
report
report
report
1970
1972
1984
1991
1997
2001
1971
1973
1985
1998
1998
2008
1972
1976
1986
1996
1999
2015
1973
none indicated
1986 amended
1998
2000
2025
1974
none indicated
1987
2002
2001
2029
1975
late 1990s
1988
2005
2002
2030
1976
early 1990s
1989
— a
2003
2026
1977
late 1980s
1990
2003
2004
2019
1978
1990
1991
2005
2005
2020
1979
1992
1992
2002
2006
2018
1980
1994
1993
1999
2007
2019
1981
1991
1994
2001
2008
2019
1982
1987
1995
2002
1983
1990
1996
2001
Source: Intermediate projections of various HI trustees’ reports, 1970-2008.
a. Contained no long-range projections.
What Would Happen If the Fund Became Insolvent?
Payments cannot be made from the HI fund unless there are sufficient monies
credited to it. Neither the Social Security trust fund nor the Medicare trust fund has
ever run out of money and there are no provisions in the Social Security Act
governing what would happen in such an event. There is no authority in law for a
general revenue funding of the shortfall. Of course, the fund would continue to have
payroll taxes credited to it though these would be insufficient to pay all the pending
claims.
Long-Range Financing Issues
The projected insolvency date is only one measure of the financial soundness
of the Part A program. The 2008 trustees’ report states that the fund fails to meet
both the short and long-range tests for financial adequacy. Further, they contend that
the financial soundness of the entire Medicare program must be addressed. For a
further discussion of this issue, see CRS Report RS20173, Medicare: Financing the
Part A Hospital Insurance Program
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