The independent source for health policy research, polling, and news.
The independent source for health policy research, polling, and news.
Elizabeth Williams, Alice Burns, Rhiannon Euhus, and Robin Rudowitz
Published:
There are several options under consideration in Congress to significantly reduce Medicaid spending to help pay for an extension of expiring tax cuts. Medicaid is the primary program providing comprehensive health and long-term care to one in five people living in the U.S. and accounts for nearly $1 out of every $5 spent on health care. Medicaid is administered by states within broad federal rules and jointly funded by states and the federal government, meaning restrictions in federal Medicaid spending could leave states with tough choices about how to offset reductions. This analysis examines the potential impacts on states and Medicaid enrollees of one prominent proposal, which would eliminate the 90% federal match rate for the Affordable Care Act (ACA) expansion, which currently covers over 20 million people. Key takeaways include:
States that have implemented the ACA Medicaid expansion currently receive a 90% federal match rate or “FMAP” for adults covered through the expansion, meaning the federal government pays 90% of the costs for expansion enrollees. The ACA expanded Medicaid coverage to nearly all adults with incomes up to 138% of the Federal Poverty Level ($21,597 for an individual in 2025). However, a Supreme Court ruling effectively made the decision to implement the Medicaid expansion an option for states. Forty-one states (including DC) have since adopted Medicaid expansion, and Medicaid expansion enrollees represent nearly a quarter of Medicaid enrollment (as of March 2024) and one-fifth of total Medicaid spending (as of FY 2023). The FMAP for services used by people eligible through traditional Medicaid is determined by a formula set in statute. The formula is designed so that the federal government provides a match rate of at least 50% and provides a higher match rate for states with lower average per capita income. For FY 2026, the traditional FMAP will range from 50% to 77%.
This analysis estimates the impact of eliminating the enhanced FMAP for adults in the Medicaid expansion. The analysis assumes that, starting in FY 2026, expenditures for people eligible in the Medicaid expansion would be matched at each state’s traditional 2026 FMAP rate. Details regarding the design of this policy change have yet to be released, and the details of proposed legislation may differ from the assumptions made to complete this analysis. This is also only one of the various Medicaid policy changes that have been suggested and estimates would change if multiple policies were considered together.
This analysis does not make assumptions about specific state behavioral responses and instead examines the impact of eliminating the ACA expansion match rate under two scenarios. These scenarios are designed to illustrate the range of potential policy change effects; in practice, each state may respond to the policy change differently. While some states may choose to continue ACA Medicaid expansion coverage with substantially reduced federal funding, many likely would not given the extra spending that would be required. The analysis also excludes secondary effects such as people who lose coverage through the Medicaid expansion enrolling in Medicaid under other eligibility pathways or enrolling in private health coverage. The estimates presented here are not directly comparable to the estimates of federal savings from the Congressional Budget Office (CBO) because CBO’s estimates account for assumptions about state behavioral responses and other secondary effects.
Eliminating the enhanced FMAP for adults in the Medicaid expansion could reduce Medicaid spending by nearly one-fifth ($1.9 trillion) over a 10-year period and up to nearly a quarter of all Medicaid enrollees (20 million people) could lose coverage. Under scenario 1, federal Medicaid spending would decrease by $626 billion or 10% across all states over the 10-year period, with the federal government providing matching funds at the standard rate rather than 90%. If all states picked up those costs and retained the Medicaid expansion, that would mean an additional $626 billion in state spending or a 17% increase in state spending across all states over the 10-year period. Under scenario 2, all state and federal financial support for Medicaid expansion is withdrawn, resulting in a $1.7 trillion dollar or 25% cut to federal Medicaid spending and a $186 billion dollar or 5% cut to state Medicaid spending across all states, including non-expansion. Combined, Medicaid spending would decrease by 18% or $1.9 trillion over the 10-year period. The cuts are even larger when looking among expansion states alone, resulting in a 31% decline in federal spending, a 6% decline in state spending, and a 22% decline in total spending. Under this scenario, an estimated 20 million Medicaid enrollees eligible through expansion would lose coverage, decreasing total Medicaid enrollment by 24% (by year 10).
Only states that have adopted the Medicaid expansion would see any spending or enrollment impacts under this policy proposal, though changes vary by state (Figure 2 and Appendix Table 1). The 10 states, primarily in the South, that have not expanded Medicaid under the ACA would see no change. Enrollment under scenario 1 would not change from baseline projections with states picking up the extra cost, but enrollment declines under scenario 2 vary by state, ranging from a decrease in estimated total Medicaid enrollment by year 10 of 19% in Massachusetts, Minnesota, North Carolina, and South Dakota to 49% in Oregon. The number of enrollees that could lose coverage ranges from 5 million in California to 24 thousand in North Dakota and South Dakota. (This analysis includes all states that had expanded Medicaid as of February 2025. In practice, there could also be effects in states that expand Medicaid in the years after 2025. In its baseline projections of Medicaid enrollment and spending, CBO assumes some states will continue to expand Medicaid but does not specify which states those are.)
Twelve states currently have “trigger” laws in place that would automatically end expansion or require changes if the federal match rate were to drop, but coverage would be at risk in other states given the substantial loss of federal funding. Not all trigger laws would immediately end the Medicaid expansion, but enrollees in states with trigger laws are at greater risk of losing coverage. States are actively debating their Medicaid expansion trigger laws, with some states working to remove and others working to establish the automatic termination of Medicaid expansion coverage if federal support declines.
If states maintained their Medicaid expansion coverage in the wake of this policy change, they would need to find ways to offset the loss of federal funding. This could include increasing state tax revenues or decreasing spending on non-Medicaid services such as education, which is the largest source of expenditures from state funds. States could alternatively decrease Medicaid coverage for other groups, eliminate coverage of optional benefits such as prescription drugs and home care, or reduce provider payment rates. Given the size of the federal funding cut, states would face significant challenges in efforts to replace the loss of federal funds, which would be exacerbated if paired with other reductions in federal funding for Medicaid or in other areas such as education.
If states are unable to maintain Medicaid expansion coverage (or terminate expansion due to a trigger law), the number of uninsured would increase and could reverse gains in financial security, access to care, and health outcomes associated with Medicaid expansion. In all states, some of the people who lose expansion eligibility may qualify for Medicaid under a different eligibility pathway, for example based on a disability, but some of those people may only qualify for partial Medicaid benefits such as coverage of family planning services or breast and cervical cancer screening and prevention. Other enrollees with incomes between 100% and 138% of poverty could be eligible for coverage through the ACA marketplaces, but ACA coverage will soon become more costly for enrollees if the enhanced subsidies expire at the end of 2025. Enrollees with incomes below poverty could fall into the coverage gap. Research shows that after losing Medicaid, many people become uninsured. Increasing numbers of uninsured people could lead to loss of revenues and increased uncompensated care costs for providers. A large body of prior research shows that Medicaid expansion has helped to reduce the uninsured rate and improve health care access, affordability, and financial security among the low-income population. More recent research shows improvements in health outcomes and continues to show positive effects for providers (particularly rural hospitals) and for sexual and reproductive health. Because of the widespread adoption of the Medicaid expansion across states, the financial and coverage impacts will fall on states that voted for President Trump and those that voted for former Vice President Harris.
Data: To project Medicaid enrollment, spending, and spending per enrollee by state and eligibility group, this analysis uses the Medicaid CMS-64 new adult group expenditure data collected through MBES for FY 2023 (downloaded in December 2024), Medicaid new adult group enrollment data collected through MBES for June 2024 (downloaded in December 2024), the 2019-2021 T-MSIS Research Identifiable Demographic-Eligibility and Claims Files, and the June 2024 Congressional Budget Office (CBO) baseline.
Overview of Approach:
Definitions and Limitations:
We provide more details about the baseline model below.
We provide more details about the policy change scenarios below.
Feb 2025
KFF Headquarters: 185 Berry St., Suite 2000, San Francisco, CA 94107 | Phone 650-854-9400
Washington Offices and Barbara Jordan Conference Center: 1330 G Street, NW, Washington, DC 20005 | Phone 202-347-5270
www.kff.org | Email Alerts: kff.org/email | facebook.com/KFF | twitter.com/kff
The independent source for health policy research, polling, and news, KFF is a nonprofit organization based in San Francisco, California.
