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  • The Health Reform Law’s Medicaid Expansion: A Guide to the Supreme Court Arguments

    Issue Brief

    One significant element of the pending U.S. Supreme Court case challenging the Affordable Care Act is the constitutionality of the law's Medicaid expansion. This provision of the law requires states that choose to participate in the Medicaid program to cover nearly all adults under age 65 with household incomes at or below 133% of the federal poverty level as of January 2014. A ruling on the Medicaid expansion could have far-reaching impacts on the present…

  • 34 States Will Be Affected by the King v. Burwell Decision

    State-by-State Effects of a Ruling for the Challengers in King v. Burwell

    Interactive

    A map and table showing the number of people now receiving premium subsidies who would lose them if the Court finds for the challengers; the total amount of federal subsidy dollars; the average subsidy (or average premium tax credit) that subsidized enrollees have qualified for; and the average increase in premiums that subsidized enrollees would face if the subsidies are disallowed.

  • New Analysis Details Impact on Residents in Different States If the U.S. Supreme Court Rules for Challengers in King v. Burwell

    News Release

    The U.S. Supreme Court is expected to rule this month in the King v. Burwell case that challenges whether low- and moderate-income Americans are eligible for subsidies to help pay for insurance if they live in states where the federal government, rather than the state, established its new insurance marketplace under the Affordable Care Act (ACA). Using 2015 enrollment data released today, a new Kaiser Family Foundation analysis and interactive map breaks out how residents…

  • Change in February effectuated enrollment, by state, 2025-2026

    How Has ACA Marketplace Enrollment Changed Across States in 2026?

    Issue Brief

    Following several years of rapid enrollment growth in the Affordable Care Act (ACA) Marketplaces that corresponded with temporary enhanced premium tax credits, enrollment fell for the first time in seven years in 2026, when those tax credits expired. Every state except for New Mexico saw a drop in ACA Marketplace enrollment from 2025 to 2026. State-based Marketplaces that run their own enrollment platforms, including those that partially offset the expiring federal enhanced tax credits, generally…

  • About 5 Million Uninsured People Could Get ACA Marketplace Coverage Without a Monthly Premium – But They Would Have to Enroll Soon

    News Release

    About 5 million uninsured people across the country could get coverage through an Affordable Care Act Marketplace health plan with virtually no monthly premium if they enroll soon, a new KFF analysis finds. In most states, open enrollment runs through January 15, with tax credits available to help eligible low- and middle-income people afford coverage. Those tax credits would offset the full monthly premium for the lowest cost plan or plans for millions of uninsured…

  • Signing Up for Marketplace Coverage Remains a Challenge for Many Consumers

    Policy Watch

    As open enrollment begins for Marketplace plans, this Policy Watch provides information about consumer experiences with Marketplace sign up from the 2023 KFF Consumer Survey. Data from the survey show that Marketplace sign up has been a challenge to many consumers---often more complicated than enrollment in other kinds of health insurance. The Policy Watch also spotlights efforts to address common enrollment problems such as option overload and transitioning to Marketplace coverage from other forms of…

  • Early Indications of the Impact of the Enhanced Premium Tax Credit Expiration on 2026 Marketplace Premiums

    Issue Brief

    Every summer, health insurers submit rate filings to state regulators detailing expectations and justifying premium rate changes for ACA-regulated health plans for the coming year. With the enhanced premium tax credits set to expire at the end of 2025, consumers can expect increases in how much they pay for coverage. KFF examines 23 early insurer premium filings from Vermont, Oregon, Washington, and Washington, DC, which include an additional 4 percent increase in premiums, on average,…