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Affordable Care Act

The ACA Marketplace

2025 KFF Marketplace Enrollees Survey

In 2025, about one in three ACA enrollees said they would be “very likely” to look for a lower-premium Marketplace plan If their premium payments doubled.

Cost Concerns and Coverage Changes: A Follow-Up Survey of ACA Marketplace Enrollees

Following the expiration of the enhanced premium tax credits for people with Affordable Care Act (ACA) Marketplace plans, a new KFF follow-up survey of the same Marketplace enrollees KFF surveyed in 2025 finds half (51%) of returning enrollees say their health care costs are “a lot higher” this year compared to last year, including four in 10 who specifically say their premiums are “a lot higher.”

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POLLING

Tracking the Public’s Views on the ACA

While overall opinion of the Affordable Care Act has been more favorable than unfavorable since 2017, there remain deep partisan divides. See how public opinion on the ACA has changed from the inception of the law to the present. This interactive tool highlights key moments when views shifted and trends based on party identification, income, age, gender, and race/ethnicity.
DATA

Marketplace Enrollment is Down in 2026—But All of the Data Isn’t in Yet

ANALYSIS

Higher Premium Payments or Higher Deductibles: The ACA's Tradeoffs

QUIZ

Test Your Knowledge of the Affordable Care Act

ANALYSIS

Competition Increased in Individual Market But Fell in Fully Insured Group Markets

Timely insights and analysis from KFF staff

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  • Claims Denials and Appeals in ACA Marketplace Plans in 2024

    Issue Brief

    This brief analyzes federal transparency data published by CMS on claims denials and appeals for Marketplace plan offered on HealthCare.gov in 2024, and finds insurers denied 19% of in-network claims. Consumers rarely appeal denied claims.

  • Medicaid and Children’s Health Insurance Program Provisions in the New Health Reform Law

    Issue Brief

    This brief compares the Medicaid and Children's Health Insurance Program provisions in the new health reform law with pre-reform law governing those programs. The analysis focuses on Medicaid coverage and financing changes; how Medicaid and CHIP will interface with a new health insurance exchange and other Medicaid benefits and access changes. Overall, the new law includes an individual requirement to obtain health insurance, a significant Medicaid expansion and subsidies to help low-income individuals buy coverage…

  • The Role of the Basic Health Program in the Coverage Continuum: Opportunities, Risks & Considerations for States

    Issue Brief

    This brief assesses the potential benefits and drawbacks to states from implementing a Basic Health Program under the Affordable Care Act. The law gives states the option of creating a Basic Health Program, using federal tax money to subsidize insurance coverage for low-income residents who would otherwise be eligible to purchase coverage through a state exchange. Such a program would give states the ability to provide more affordable coverage for these low-income residents and improve…

  • Health Care Use and Chronic Conditions Among Childless Adult Medicaid Enrollees in Arizona

    Issue Brief

    Under the Affordable Care Act (ACA), beginning in 2014, Medicaid eligibility will expand to 133% of the federal poverty level for nearly all individuals. Arizona is one of the few states that already cover adults without dependent children in Medicaid through a longstanding Section 1115 waiver. This report, based on 2007 Medicaid claims data for adult Medicaid enrollees in Arizona, provides an analysis of health care utilization and health conditions for childless adults and compares…

  • Pulling it Together: Duals: The National Health Reform Experiment We Should Be talking More About

    From Drew Altman

    The Center for Medicare & Medicaid Services (CMS) and 26 states are moving to launch a large scale managed care demonstration project potentially involving millions of the poorest, sickest, most expensive Medicare and Medicaid beneficiaries, the so-called dual eligibles. The experiment is getting more and more attention from policy experts, but with controversial issues like the survival of the Affordable Care Act and converting Medicare to a premium support program grabbing the limelight, it has…

  • Summary of Coverage Provisions in the Patient Protection and Affordable Care Act

    Issue Brief

    This short summary describes the health coverage provisions contained in the final version of the Affordable Care Act signed into law in March 2010, including the individual mandate requirements, expansion of public programs, health insurance exchanges, changes to private insurance and employer requirements.

  • Optimizing Medicaid Enrollment: Spotlight on Technology

    Report

    The health reform law provides for a national expansion of Medicaid in 2014 that will extend eligibility to millions more low-income people, primarily uninsured adults. It also requires implementation of a coordinated system for determining eligibility for Medicaid and subsidized coverage in the new health insurance exchanges. Given the expected new demands on Medicaid eligibility and enrollment systems, and continuing fiscal strains on states, the impetus to streamline and automate Medicaid systems has never been…

  • Pulling it Together: How the ACA Can Help The Homeless

    From Drew Altman

    Estimates are that there are approximately 630,000 people who are homeless on any given night in the U.S. -- about two-thirds in shelters and one-third on the street or without real shelter. Several million people are estimated to experience homelessness over the course of a year. About two-thirds are individuals and the balance are in families. These numbers are virtually identical to national estimates we used when I worked intensively on the issue of homelessness in the…