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Medicare Advantage in 2025: Enrollment Update and Key Trends

In 2025, more than half (54%) of eligible Medicare beneficiaries - 34.1 million out of about 62.8 million with both Medicare Parts A and B - are enrolled in Medicare Advantage plans. The Congressional Budget Office projects that the share will rise to 64% by 2034.

One in five (21%) Medicare Advantage enrollees is in a special needs plan (SNP), reflecting a steady increase in recent years. Overall, Medicare Advantage enrollment is highly concentrated among plans owned by a few firms.

Also: Medicare Advantage in 2025: Premiums, Out-of-Pocket Limits, Supplemental Benefits, and Prior Authorization

Medicare Advantage Enrollees Account for 25% of Inpatient Hospital Days

Most Medicare Advantage Markets are Dominated by One or Two Insurers

Medicare Advantage Quality Bonus Payments Will Total at Least $12.7 Billion in 2025

Medicare Advantage Insurers Made Nearly 50 Million Prior Authorization Determinations in 2023

New & Noteworthy
Medicare PArt D

The Uncertain Future of Medicare's Stand-Alone PDP Market and Why It Matters

This brief discusses the uncertain future of Medicare’s Part D stand-alone prescription drug plan (PDP) market, in light of declining PDP availability, rising premiums, and the unknown fate of a temporary demonstration program designed to stabilize the market more broadly. The uncertain future of the market is especially relevant for rural areas, where nearly 6 in 10 beneficiaries are enrolled in traditional Medicare and PDPs, and where there are fewer Medicare Advantage options.

A Current Snapshot of the Medicare Part D Prescription Drug Benefit

Stand-Alone Drug Plans Cover a Larger Share of Part D Enrollees Living in the Most Rural Areas Than Medicare Advantage Plans

Key Facts About Medicare Part D Enrollment, Premiums, and Cost Sharing in 2025

Changes to Medicare Part D in 2024 and 2025 Under the Inflation Reduction Act and How Enrollees Will Benefit

Prescription Drugs

The Effect of Delaying the Selection of Small Molecule Drugs for Medicare Drug Price Negotiation

Part of a recent executive order from President Trump directs the Secretary of HHS to work with Congress to implement a change in the Medicare Drug Price Negotiation Program to delay negotiation of so-called “small molecule” drugs beyond 7 years after FDA approval under current law. If that timeframe had already been in place, more than half of the Part D drugs that were selected for price negotiation in the first or second rounds – 13 out of 25 – would not have been eligible at the time drugs were selected.

FAQs About the IRA's Medicare Drug Price Negotiation Program

Allowing Medicare to Negotiate Drug Prices Is Broadly Popular

The Facts About the $35 Insulin Copay Cap in Medicare

Enrollees in Most Rural Areas Rely More on Stand-alone Part D Plans

Data Visualization

The Facts About Medicare Spending

This interactive provides the facts on Medicare spending. Medicare, which serves 67 million people and accounts for 12 percent of the federal budget and 21 percent of national health spending, is often the focus of discussions about health expenditures, health care affordability and the sustainability of federal health programs.

Explore data on enrollment growth, Medicare spending trends overall and per person, growth in Medicare spending relative to private insurance, spending on benefits and Medicare Advantage, Part A trust fund solvency challenges, and growth in out-of-pocket spending by beneficiaries.

Related: FAQs on Medicare Financing and Trust Fund Solvency

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  • Medicare Part D 2008 Data Spotlight: Ten Most Common Brand-Name Drugs

    Issue Brief

    This Medicare Part D Data Spotlight examines the variation in 2008 Part D plan coverage, cost sharing and utilization management tools for the 10 prescriptions most commonly used by Medicare beneficiaries, including treatments for cholesterol, cardiovascular health, osteoporosis, dementia, gastrointestinal reflux and ulcers.

  • Medicare and the President’s Fiscal Year 2009 Budget Proposal

    Fact Sheet

    Medicare and the President's Fiscal Year 2009 Budget Proposal This fact sheet summarizes key Medicare-related provisions in the Bush Administration's fiscal year 2009 budget proposal, as well as additional legislation that responds to the Medicare Trustees' "Medicare Funding Warning." Fact Sheet (.

  • Medicare Part D 2008 Data Spotlight: Utilization Management

    Issue Brief

    This Medicare Part D data spotlight examines three common techniques used by Medicare stand-alone prescription drug plans in 2008 to manage enrollees’ use of formulary drugs, such as quantity limits, prior authorization, and step therapy rules. This is one in a series analyzing key aspects of the 2008 Medicare Part D prescription drug plan choices.

  • Methodology Appendix to the Medicare Part D 2008 Data Spotlights

    Issue Brief

    The Kaiser Family Foundation has also posted an appendix detailing the methodology used in the Medicare Part D 2008 Data Spotlight series. The series analyzes key aspects of the 2008 Medicare Part D prescription drug plan choices.

  • Medicare Part D 2008 Data Spotlight: Formularies

    Issue Brief

    This Medicare Part D data spotlight examines the formularies (list of covered drugs) of Medicare stand-alone prescription drug plans in 2008, changes since 2006, and differences in how plans cover brand-name and generic drugs. This is one in a series analyzing key aspects of the 2008 Medicare Part D prescription drug plan choices.

  • The Value of Extra Benefits Offered by Medicare Advantage Plans in 2006

    Report

    The Value of Extra Benefits Offered by Medicare Advantage Plans in 2006 As Medicare Advantage enrollment continues to climb, this report prepared for the Kaiser Family Foundation compares the value of extra benefits provided by private fee-for-service and other types of Medicare Advantage plans. As of January 2008, 8.

  • Do We Know If Medicare Advantage Special Needs Plans Are Special?

    Report

    This report describes the history of special needs plans, how they fit into the larger Medicare Advantage marketplace, and what information could help assess whether these plans are performing differently from other Medicare Advantage plans.

  • Medicare Part D 2008 Data Spotlights

    Issue Brief

    To better understand changes in the private plans providing drug coverage to Medicare beneficiaries under the program's Part D benefit, the Kaiser Family Foundation is issuing a series of data spotlights analyzing key elements of Medicare's private drug plans.

  • Medicare Part D 2008 Data Spotlight: Specialty Tiers

    Issue Brief

    This Medicare Part D data spotlight focuses on the use of specialty tiers for high-cost and injectible drugs in Medicare Prescription Drug Plans in 2008. It finds that the number of plans with specialty tiers has nearly doubled since 2006.