Medicare Advantage Turmoil: What It Means for Your Care

Medicare Advantage — the private insurance alternative to Original Medicare that now covers more than 33 million Americans — is going through one of its most disruptive periods in the program's history. Insurers that spent years aggressively expanding their Medicare Advantage footprints are now pulling back hard, cutting supplemental benefits, narrowing provider networks, and in some cases exiting entire counties or states. For beneficiaries caught in the middle, the consequences are immediate and personal: your plan may no longer cover your cardiologist, your dental benefits may have shrunk, or your insurer may have sent you a notice saying your plan is being discontinued at the end of the year.

The financial pressure driving this disruption is real. Medicare Advantage plans are paid a fixed monthly amount per enrollee by the federal government, based on a risk-adjustment formula managed by the Centers for Medicare & Medicaid Services (CMS). In recent years, CMS has tightened that formula and increased audits of how insurers code patient diagnoses — a process called Risk Adjustment Data Validation, or RADV. When insurers coded patients as sicker than auditors determined them to be, they received higher payments than CMS believes they were owed. The agency has been clawing back those overpayments, and the financial hit has been significant. Humana, for example, reported billions in Medicare Advantage losses and announced it would exit dozens of markets and reduce enrollment by hundreds of thousands of members in 2025. UnitedHealthcare similarly trimmed its footprint and scaled back certain supplemental benefits in 2025 plans.

For beneficiaries, the most immediate disruption often shows up in the provider network. Hospitals and physician groups across the country have been terminating or declining to renew their Medicare Advantage contracts, citing two main complaints: prior authorization denials that delay or block care, and slow or reduced reimbursement rates. When a major health system drops a Medicare Advantage insurer, patients who have been seeing those doctors for years suddenly face a choice — pay out-of-network rates, which can be dramatically higher, or switch plans. In some markets, large academic medical centers have dropped multiple insurers simultaneously, leaving beneficiaries with few in-network options for specialized care. A 2024 KFF analysis found that prior authorization denial rates vary widely across Medicare Advantage plans, with some plans denying more than 10% of prior authorization requests — a rate that directly affects whether you can get a specialist referral, a post-surgical rehab stay, or an advanced imaging scan approved.

If your Medicare Advantage plan is being discontinued — meaning the insurer is pulling out of your county entirely — CMS requires the insurer to notify you by October 2 of the prior year. That notification triggers a Special Enrollment Period (SEP) that allows you to switch to another Medicare Advantage plan or return to Original Medicare, typically with a window running from October 1 through the end of February of the following year. This is critically different from the standard Annual Enrollment Period (AEP), which runs October 15 through December 7 each year. If you receive a plan discontinuation notice, do not wait until October 15 — your SEP window may already be open and you should act immediately to avoid a gap in coverage. You can compare available plans in your ZIP code at Medicare.gov's Plan Finder tool, which is updated annually with current premium, deductible, and network information.

Even if your plan isn't being discontinued outright, you may notice quieter but equally important changes. In 2025, many Medicare Advantage plans reduced or eliminated supplemental benefits that had become selling points in prior years — things like over-the-counter allowances, dental coverage beyond basic cleanings, vision hardware benefits, and fitness memberships. CMS data shows that the average Medicare Advantage plan in 2025 offers fewer supplemental benefits than in 2024, reversing a multi-year trend of benefit expansion. If you enrolled in your current plan specifically because of a $500 dental allowance or a $150 quarterly OTC card, check your 2025 Evidence of Coverage document carefully — those amounts may have been reduced or the benefit may have been eliminated entirely. Your Evidence of Coverage is the legally binding document that supersedes any marketing materials you received.

The prior authorization problem deserves special attention because it directly affects your ability to get timely care. Medicare Advantage plans are legally permitted to require prior authorization for services that Original Medicare covers without it — and many plans use this aggressively. CMS finalized new rules in 2024 requiring Medicare Advantage plans to make prior authorization decisions for urgent requests within 72 hours and standard requests within 7 calendar days, and to provide specific clinical reasons for any denial. If your plan denies a prior authorization request, you have the right to appeal. The first level of appeal goes to the plan itself, and if denied again, you can escalate to an independent review organization. Critically, if you need urgent care and your plan is taking too long, you can request an expedited appeal, which requires a decision within 72 hours. The Medicare Rights Center (medicarerights.org) offers free counseling to help beneficiaries navigate these appeals.

For beneficiaries who are reconsidering whether Medicare Advantage is still the right choice, it's worth understanding what returning to Original Medicare actually involves. Original Medicare (Parts A and B) gives you access to any provider in the country who accepts Medicare — which is the vast majority of hospitals and physicians — without network restrictions or prior authorization for most services. The tradeoff is that Original Medicare has no out-of-pocket maximum, meaning your costs for a serious illness could be substantial without a Medigap supplemental policy. Medigap plans (also called Medicare Supplement plans) cover most or all of the cost-sharing gaps in Original Medicare, but they carry a monthly premium — typically ranging from roughly $100 to $300 or more per month depending on your age, location, and the plan type you choose. The most comprehensive Medigap option currently available to new enrollees is Plan G, which covers everything except the Part B deductible ($257 in 2025).

Here's the catch that stops many people from switching back: if you've been in Medicare Advantage for more than 12 months, you generally do not have a guaranteed right to buy a Medigap policy. Insurers in most states can use medical underwriting to deny you coverage or charge you higher premiums based on your health history. There are important exceptions. If you live in one of the birthday rule states — California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, or Oregon — you have a 30-day window each year around your birthday to switch Medigap plans without medical underwriting. New York and Connecticut go further, offering guaranteed issue Medigap rights year-round regardless of health status. If you're in a state without these protections and you have significant health conditions, switching back to Original Medicare with a Medigap plan may be difficult or expensive — which is exactly why choosing a Medicare Advantage plan carefully in the first place matters so much.

If you're staying in Medicare Advantage and want to protect yourself going forward, the most important thing you can do before the next Annual Enrollment Period (October 15 through December 7) is verify that your specific doctors and your preferred hospital are still in-network for any plan you're considering — not just the plan's general network, but your individual providers. Call the provider's billing office directly and ask whether they are currently contracted with the specific plan and plan year you're evaluating. Plan Finder on Medicare.gov shows network information, but provider databases can lag behind real-world contract changes. Also check the plan's formulary — the list of covered drugs — to confirm your medications are covered at the tier level you expect, since formularies change annually and a drug that was Tier 2 in 2025 may move to Tier 3 or require prior authorization in 2026. Your State Health Insurance Assistance Program (SHIP) offers free, unbiased counseling to help you compare plans; find your local SHIP counselor at shiphelp.org.