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.
Jeannie Fuglesten Biniek, an Associate Director for the Program on Medicare Policy at KFF, testified before the Senate Homeland Security and Government Affairs Committee Permanent Subcommittee on Investigations on May 17, 2023 as part of a hearing on Examining Health Care Denials and Delays in Medicare Advantage.
Congress asked the U.S Department of Health and Human Services (HHS) Office of the Inspector General (OIG) to investigate whether Medicaid MCOs are providing medically necessary health care services to their enrollees. OIG found that Medicaid MCOs had an overall prior authorization denial rate of 12.5%–more than 2 times higher than the Medicare Advantage rate. Prior authorization denial rates ranged widely across and within parent firms and states. After a prior authorization request is denied, Medicaid enrollees can appeal, but it’s not always straightforward and many appeals don’t change the initial decision. Unlike in Medicare Advantage, if a Medicaid MCO upholds its original denial, there is no automatic, independent external medical review. OIG found that state Medicaid agency oversight of prior authorization denials is limited. The OIG report underscores concerns about prior authorization and access in Medicaid managed care, keeping this issue at the forefront of ongoing policy discussions.
To capture Medicare beneficiaries’ views and experiences in choosing between traditional Medicare and private plans, and among private plans, and the factors that influence these decisions, KFF worked with PerryUndem to conduct focus groups with Medicare beneficiaries in the Fall of 2022, during the annual Medicare open enrollment period. This report summarizes first-hand accounts of participants’ reactions open enrollment advertising and factors that influence their decision-making around Medicare plan choice.
Medicare Advantage enrollment is lower, but has grown more rapidly in recent years in rural areas than in metropolitan areas. In 2023, nearly 40% of eligible Medicare beneficiaries in rural areas are in Medicare Advantage. Rural Medicare beneficiaries can choose from 27 Medicare Advantage plans on average and most are enrolled in a plan that charges no additional premium.
Each year, Medicare beneficiaries have an opportunity to make changes to how they receive their Medicare coverage during the nearly 8-week annual open enrollment period. This brief answers key questions about the Medicare open enrollment period and Medicare coverage options.
Medicare Part D prescription drug coverage is available for people with Medicare who enroll in private plans, either a stand-alone prescription drug plan (PDP) for people in traditional Medicare, or a Medicare Advantage plan that covers all Medicare benefits, including prescription drugs (MA-PD). This issue brief provides an overview of Part D plan availability and premiums in 2024 and key trends over time.
For 2024, the average Medicare beneficiary has access to 43 Medicare Advantage plans and can choose from plans offered by 8 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.
This brief summarizes findings from 20 studies published between January 1, 2018 and April 1, 2023 that compare quality of care and beneficiary experiences between people of color in Medicare Advantage and White enrollees, or the total Medicare Advantage population.
This analysis examines the extent to which large private and non-federal public employers that offer retiree health benefits are turning to Medicare Advantage and why they are making this shift, using data from the 2024 Employer Health Benefits Survey. We find that slightly more than half (56%) of large employers offering retiree health benefits to Medicare-age retirees offer coverage to at least some retirees through a contract with a Medicare Advantage plan, more than double the share in 2017 (26%).
This issue briefs lays out 10 reasons why Medicare Advantage enrollment has been growing and why we can expect more growth in the years to come.
© 2026 KFF