ACA Marketplaces

This brief estimates the number of current Marketplace enrollees with a mental health diagnosis to understand what changes in enrollment may mean for access to services. Among the 24.3 million Marketplace enrollees in 2025, over 4.4 million individuals are estimated to have at least one mental health diagnosis on a health care claim.

In this July 1 column for The New York Times Opinion section, KFF Executive Vice President for Health Policy Larry Levitt explains how the budget reconciliation bill passed by the Senate on July 1 is effectively a partial repeal of the Affordable Care Act (ACA) and, if signed into law,…

This analysis looks at the individual market enrollees who make at least four times the federal poverty level who would no longer be eligible for any tax credits if the current ACA Marketplace enhanced subsidies expire at the end of this year. Compared to other people with similar incomes, these enrollees are more likely to be early retirees, self-employed and living in rural areas.

This analysis of preliminary rate filings submitted by 105 ACA Marketplace insurers in 19 states and DC shows that ACA Marketplace insurers are requesting a median premium increase of 15% for 2026, which would represent the largest hike in premiums since 2018, the last time policy uncertainty contributed to sharp premium growth. The scheduled expiration of enhanced tax credits and impact of tariffs on some drugs, medical equipment, and supplies are among the factors pushing premiums higher

Karen Pollitz answers three questions on the Trump administration’s recent changes to the ACA Section 1332 state innovation waiver guidelines and the implications for consumers and state marketplaces in our new “Ask KFF” feature.

Karen Pollitz, senior fellow for health reform and private insurance at KFF, answers three questions about denied claims and how the federal government may change the data insurers are required to report on this issue.

This Health Policy 101 chapter provides an overview of the Affordable Care Act (ACA), a major reform of the U.S. health care system aimed at reducing high uninsured rates and alleviating issues like high out-of-pocket costs and coverage exclusions for preexisting conditions. The ACA significantly altered many aspects of the health system and the chapter explores its mechanisms, such as the Health Insurance Marketplaces, and the evolution of the law since its passage in 2010.

In 2024, Affordable Care Act (ACA) Marketplace enrollment hit a new record high, reaching over 21 million people. This policy watch discusses the the factors contributing to the increased enrollment in the fastest growing marketplaces.

The states with the fastest recent growth in ACA Marketplace signups also had among the highest uninsured rates previously, as enhanced subsidies helped to make coverage more affordable for many consumers, particularly in southern states that did not expand their Medicaid programs to cover low-income adults, a new KFF analysis…

This analysis details how ACA marketplace premiums changed by county from 2023 to 2024, after taking into account expanded subsidies available under the Inflation Reduction Act.