Medicare Advantage — the privately run alternative to Original Medicare that now covers more than half of all Medicare beneficiaries — is going through one of its most disruptive stretches in the program's history. Insurers that aggressively expanded their plan offerings during the early 2020s are now pulling back sharply, citing higher-than-expected medical costs, tighter federal payment rates, and mounting losses. For the roughly 33 million Americans enrolled in Medicare Advantage plans in 2025, this isn't an abstract industry story. It means your plan may be disappearing, your doctor may be dropping out of your network, or the benefits you counted on — like dental, vision, or over-the-counter allowances — may be shrinking or gone.
The financial pressure on Medicare Advantage insurers became acute in 2023 and 2024 when utilization — meaning how often enrollees actually used medical services — surged well above what insurers had projected. Seniors who had deferred care during the COVID-19 pandemic came back to doctors' offices and hospitals in large numbers. At the same time, the Centers for Medicare & Medicaid Services (CMS) adjusted its payment methodology in ways that reduced how much insurers received per enrollee in certain risk categories. Major insurers including Humana, CVS Health (Aetna), and UnitedHealth Group all reported significant Medicare Advantage losses and announced they would exit certain counties or states, reduce plan offerings, or cut supplemental benefits for plan year 2025 and into 2026.
Humana, for example, announced it would exit hundreds of counties across the country for 2025, affecting an estimated 560,000 enrollees who had to find new coverage. That's not a minor inconvenience — being forced to switch plans mid-retirement can disrupt established care relationships, change your drug formulary, and alter your out-of-pocket cost structure overnight. When a plan exits your service area, CMS does provide a Special Enrollment Period (SEP) that typically runs from the date you receive your plan termination notice through February 28 of the following year, giving you time to switch to another Medicare Advantage plan or return to Original Medicare. But knowing that window exists and acting on it are two very different things, especially when you're managing health conditions at the same time.
The provider side of this disruption is equally significant and often less visible to beneficiaries until it's too late. Hospitals, physician groups, and specialty practices across the country have been terminating or declining to renew their contracts with Medicare Advantage insurers at an accelerating rate. The core complaints from providers are consistent: prior authorization requirements that delay or deny care, payment rates that fall below the cost of providing services, and administrative burdens that consume staff time without improving patient outcomes. Major health systems including Tufts Medicine in Massachusetts, Baylor Scott & White in Texas, and several large hospital networks in the Southeast have publicly ended or threatened to end contracts with specific Medicare Advantage plans in recent years. When that happens, enrollees in those plans either lose in-network access to those facilities — meaning they pay significantly higher out-of-pocket costs or must travel farther for care — or they must switch plans entirely.
For a beneficiary managing a chronic condition like heart failure, diabetes, or cancer, a mid-year network disruption can be genuinely dangerous. If your cardiologist or oncologist drops out of your plan's network, you face a difficult choice: pay out-of-network rates that can run into thousands of dollars, switch plans if you qualify for an SEP, or delay care while you sort out your options. CMS does allow a Special Enrollment Period when you lose access to a primary care provider or specialist due to a network change, but the rules are specific and the window is limited — typically two months from the date you're notified of the network change. If you receive a letter saying your provider is leaving your plan's network, treat it as urgent and call 1-800-MEDICARE (1-800-633-4227) or your State Health Insurance Assistance Program (SHIP) counselor immediately.
The benefit cuts accompanying this financial retrenchment are also real and measurable. During the Medicare Advantage boom years of 2020–2023, insurers competed aggressively by loading plans with supplemental benefits — things like $500 or $1,000 annual dental allowances, vision and hearing coverage, gym memberships, and over-the-counter product cards worth $50 to $150 per quarter. Many of those extras are now being reduced or eliminated. According to KFF analysis of plan data, the average Medicare Advantage plan offered fewer supplemental benefits in 2025 than in 2024, and the value of those benefits declined meaningfully. If you enrolled in a plan specifically because it covered your hearing aids or offered a generous dental benefit, you need to verify that those benefits still exist at the same level for 2026 — don't assume last year's plan document still applies.
The Annual Enrollment Period running from October 15 through December 7 each year is your primary opportunity to respond to all of this. During AEP, you can switch from one Medicare Advantage plan to another, drop Medicare Advantage and return to Original Medicare (with or without a Part D drug plan), or change your Part D standalone drug plan. Coverage changes made during AEP take effect January 1 of the following year. If you missed AEP and are now realizing your plan has problems, the Open Enrollment Period from January 1 through March 31 allows you to make one switch — from one Medicare Advantage plan to another, or from Medicare Advantage back to Original Medicare. You cannot use OEP to switch from Original Medicare into a Medicare Advantage plan.
One critical consideration if you're thinking about leaving Medicare Advantage and returning to Original Medicare: Medigap (Medicare Supplement) coverage. Original Medicare alone has no out-of-pocket maximum, meaning your costs for a serious illness could be unlimited. Most beneficiaries returning to Original Medicare want a Medigap policy to cap those costs. The problem is that outside of specific guaranteed-issue windows, Medigap insurers in most states can use medical underwriting — meaning they can charge you more or deny you coverage based on your health history. If you're 68 years old with diabetes and hypertension, you may find it difficult or expensive to get a Medigap plan if you didn't enroll when you first became eligible at 65. There are exceptions: if you have a guaranteed-issue right triggered by a plan termination or loss of employer coverage, insurers must sell you a Medigap policy at standard rates regardless of your health. Confirm whether your situation qualifies before making the switch.
If you live in one of the states with a birthday rule — California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, or Oregon — you have an annual 30-day window around your birthday to switch to a Medigap plan with equal or lesser benefits without medical underwriting. This is a meaningful protection that beneficiaries in these states should know about and use strategically, particularly if they're considering leaving Medicare Advantage during a period of market instability.
When evaluating Medicare Advantage plans for 2026, go beyond the premium. A $0 premium plan that has a narrow network, high specialist copays, aggressive prior authorization requirements, and limited drug coverage may cost you far more than a plan with a modest monthly premium and broader access. Use the Medicare Plan Finder tool at Medicare.gov to compare plans available in your zip code. Enter your specific prescription drugs to see how each plan's formulary covers them and what your estimated annual drug costs would be. Check whether your current doctors and preferred hospitals are listed as in-network — and then call those providers directly to confirm, because the online directories are not always current. CMS has acknowledged that Medicare Advantage network directories have accuracy problems, and a provider listed as in-network online may have already terminated their contract.
Your State Health Insurance Assistance Program offers free, unbiased counseling from trained volunteers who can walk you through plan comparisons, enrollment decisions, and your rights as a beneficiary. SHIP counselors are not selling anything and have no financial stake in your decision. To find your local SHIP, visit shiphelp.org or call 1-800-MEDICARE. If you believe a plan has wrongly denied a claim or prior authorization, you have the right to appeal — and Medicare Advantage plans are required to provide you with a written denial notice that explains the reason and your appeal rights. Don't accept a denial without reviewing it carefully and considering an appeal, particularly for services your doctor has determined are medically necessary.
The broader policy debate about Medicare Advantage's future is ongoing in Washington. CMS has been adjusting payment rates and tightening oversight of prior authorization practices, including a 2024 rule requiring faster decisions on prior authorization requests and greater transparency about denial rates. Congress has also held hearings examining whether Medicare Advantage plans are delivering the value they promise. None of that resolves your immediate coverage situation, but it does signal that regulators are paying attention to the disruption beneficiaries are experiencing. In the meantime, the most protective thing you can do is treat your Medicare coverage as an active, annual decision — not a set-it-and-forget-it choice — and use every available resource to make sure your plan still fits your health needs and your budget.