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Data currently being released represent Open Enrollment ACA Marketplace plan selections, or how many people have signed up for or been automatically renewed into 2026 coverage. These data do not necessarily translate to enrollments. That is because people who have selected a plan or been automatically renewed may not ultimately choose to pay for their coverage, thus “effectuating” their enrollment.
After failed Senate votes late last year and no subsequent bipartisan agreement, the enhanced premium tax credits expired as of January 1. Some states, particularly those operating State-Based Marketplaces (SBMs), have been preparing for this possibility for months and are moving to blunt the impact on consumers by implementing their own state-funded subsidies and implementing other programs aimed at stabilizing the cost of unsubsidized premiums.
This analysis examines the potential impacts on states and Medicaid enrollees of eliminating the 90% federal match rate for the Affordable Care Act (ACA) expansion. Eliminating the federal match rate 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.
In 2025, more than half (54%) of eligible Medicare beneficiaries are enrolled in Medicare Advantage plans. This brief provides current information about Medicare Advantage enrollment, by plan type and firm, and shows how enrollment varies by state and county.
This brief evaluates what is currently known about fraud and abuse in the Affordable Care Act (ACA) Marketplace, including how the final Marketplace Integrity and Affordability Rule and the recently enacted budget reconciliation law change existing Marketplace enrollment and eligibility standards.
Prior KFF analysis allocated CBO’s federal Medicaid spending reductions and enrollment losses across the states, and this policy watch builds on that analysis to examine the potential impacts in expansion states compared with non-expansion states.
On May 22, the House passed a reconciliation bill, the One Big Beautiful Bill Act, which would partially pay to extend expiring tax cuts by cutting Medicaid. The Congressional Budget Office (CBO) estimates that the bill would reduce federal Medicaid spending by $793 billion over ten years and 10.3 million fewer people would be enrolled in Medicaid in 2034, including 1.3 million people with Medicare, otherwise known as “dual-eligible individuals”.
Taken together, the reconciliation bill's provisions impose additional administrative burdens on state-based marketplaces and could limit state flexibility in choosing marketplace policies and procedures.
The Congressional Budget Office’s (CBO) latest estimate shows that the One Big Beautiful Bill would reduce federal Medicaid spending by $793 and that the Medicaid provisions would increase the number of uninsured people by 7.8 million. Previous CBO estimates show that 10.3 million fewer people would be enrolled in Medicaid in 2034. Building on prior KFF analysis, this analysis allocates these estimated federal spending reductions and enrollment losses across the states.
In his latest column, President and CEO Drew Altman shows how proposals contained in the House reconciliation bill could result in a one-third reduction in ACA Marketplace enrollment. “While all eyes are on the big Medicaid cuts being proposed in the House,” he writes, “significant changes are also being proposed that together would dramatically reduce enrollment in the ACA Marketplaces.”
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