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.
In this JAMA Forum column, KFF’s Larry Levitt examines the growing role of private insurance companies in public programs, including Medicare Advantage and Medicaid managed care, and the tradeoffs that result.
Total Medicare Private Health Plan Enrollment, 1999-2013 Download Source MPR/Kaiser Family Foundation analysis of CMS Medicare Advantage enrollment files, 2008-2013, and MPR, “Tracking Medicare Health and Prescription Drug Plans Monthly Report,” 2001-2007; enrollment numbers from March of the respective year, with the exception of 2006, which is from April.
In the latest post in the Policy Insights series, Tricia Neuman draws on the experiences of Medicare beneficiaries during Medicare’s annual enrollment period to consider whether consumers with health insurance coverage through the Affordable Care Act’s new marketplaces will shop for a better deal during their open enrollment season. Previous columns in the Policy Insights series are also available on kff.org.
Medicare: The Essentials (July 2013) Download 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.
This data spotlight examines at enrollment trends in Medicare Advantage plans, including Health Maintenance Organizations (HMOs), Preferred Provider Organizations (PPOs) and Private Fee-for-Service (PFFS) plans. These plans are paid by the government to provide Medicare-covered benefits to those who choose to enroll in them. As of March 2010, a record 11.
Most Medicare beneficiaries have at least 40 Medicare Advantage (MA) plan options to choose from this year. While some favor a robust marketplace, others argue that fewer plan offerings, or more transparent differences across plans designs, would help beneficiaries choose plans most likely to meet their individual needs.
A new KFF analysis finds that a relatively small share of people with Medicare Advantage or stand-alone Medicare Part D prescription drug coverage voluntarily switch plans during Medicare’s open enrollment period, which runs annually from Oct. 15 to Dec. 7.
The analysis finds that people who switched from traditional Medicare to Medicare Advantage in 2016 had health spending in 2015 that was $1,253 less, on average, than the average spending for beneficiaries who remained in traditional Medicare (after adjusting for health risk). The findings suggest that the current payment method may systematically overestimate expected costs of Medicare Advantage enrollees. Adjusting payments to reflect Medicare Advantage enrollees’ prior use of health services could potentially lower total Medicare spending by billions of dollars over a decade.
Medicare Advantage plans gain beneficiaries from traditional Medicare who have lower average spending and use fewer health services than similar beneficiaries who choose to remain in traditional Medicare, according to a new KFF analysis.
The analysis examines enrollment in Medicare Advantage plans during beneficiaries’ first year on Medicare and finds that less than one-third or 29% enrolled in these private health plans, including HMOs or PPOs. The majority of people new to Medicare are choosing traditional Medicare in the year they first go on Medicare. The study looks at how these findings vary across age, Medicaid status, states, and counties.
© 2026 KFF