The independent source for health policy research, polling, and news.
KFF’s policy research provides facts and analysis on a wide range of policy issues and public programs.
KFF designs, conducts and analyzes original public opinion and survey research on Americans’ attitudes, knowledge, and experiences with the health care system to help amplify the public’s voice in major national debates.
KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the organization’s core operating programs.
Medicare Enrollment, 1966-2013 Download Source Centers for Medicare & Medicaid Services, Medicare Enrollment: Hospital Insurance and/or Supplemental Medical Insurance Programs for Total, Fee-for-Service and Managed Care Enrollees as of July 1, 2011: Selected Calendar Years 1966-2011; 2012-2013, HHS Budget in Brief, FY2014.
Enrollment of Dual Eligible Beneficiaries, FFY 2009 Download Source Kaiser Commission on Medicaid and the Uninsured and Urban Institute estimates based on data from FFY 2009 MSIS and CMS-64 reports, 2012. 2008 MSIS data was used for PA, UT, and WI, because 2009 data were unavailable.
For 2023, the average Medicare beneficiary has access to 43 Medicare Advantage plans and can choose from plans offered by nine firms. Among the majority of Medicare Advantage plans that cover prescription drugs, 66 percent will charge no premium in addition to the monthly Medicare Part B premium. As in previous years, the vast majority of Medicare Advantage plans will offer supplemental benefits, including fitness, dental, vision, and hearing benefits. In addition, virtually all will also offer telehealth benefits in 2023.
Enhanced Marketplace subsidies have continued to drive up enrollment in the individual market, and the loss of Medicaid coverage by millions of people could contribute to this trend, according to a new KFF analysis. Meanwhile, enrollment in non-ACA-compliant plans is at a record low. As of early 2023, an estimated 18.
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.
The adoption of new eligibility and enrollment requirements under the Affordable Care Act (ACA) provides states and the federal government an important opportunity to implement a meaningful set of performance measures for eligibility and enrollment systems.
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 to the changes in the 2025 budget reconciliation law.
This post provides details about the ongoing Special Enrollment Period to sign up for health coverage on the ACA exchanges, including who is eligible to enroll, how costly Marketplace insurance is on average, and what other factors will affect enrollment during this period.
Data currently being released represent Open Enrollment 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 effectuated enrollments. That is because people who have selected a plan or been automatically renewed may not ultimately choose to pay for their plan, thus “effectuating” their coverage.
© 2026 KFF