Roughly 3.8 million people with Medicare Advantage are getting a version of the same letter this fall: their plan will not exist when January arrives. It isn’t a premium increase or a trimmed network inside a plan that otherwise stays the same. The plan itself is being discontinued, and the explanation on the page is almost always some version of “market changes,” which is corporate shorthand for a number that stopped working for the insurer in that particular county.
That figure is up from 2.9 million last year, which was already the roughest stretch Medicare Advantage had seen. For 2027, Advantage coverage is disappearing entirely in 181 counties, up from just 67 the year before. If you live in one of those counties, there’s no local Advantage plan waiting to take you in. Everyone else whose plan is ending still has options inside their own county, but they have to go find them, because nobody is going to pick one for them.
The part that gets buried in a lot of reporting on this story is a federal protection you’re entitled to specifically because the insurer is the one ending the relationship, not you. It has nothing to do with Medicare itself and everything to do with how private insurers are allowed to underwrite health risk once you try to buy supplemental coverage on your own.
The scope of the 2027 shakeup
The 3.8 million figure covers everyone being pushed off a Medicare Advantage plan for 2027, whether their insurer left the county entirely or simply discontinued the specific plan they were enrolled in. Most of those people aren’t stranded. More than 99% of Medicare beneficiaries will still have access to at least one Advantage plan in 2027, and 97% will have ten or more to choose from. For most of the 3.8 million, this is an inconvenience that requires an afternoon of comparison shopping, not a crisis.
The harder situation belongs to the people in the 181 counties where no Advantage plan will be sold at all for 2027. Original Medicare becomes the only Medicare option there, full stop. Rural counties make up a disproportionate share of that list, which tracks with a pattern insurers have followed for years: the places with the fewest providers and the thinnest enrollment tend to be the first dropped when a plan’s margins get tight. Roughly eight in ten Advantage beneficiaries will be able to keep their current plan at the same premium or lower in 2027, which is the detail insurers tend to lead with, and the one that offers zero comfort if you’re in the minority getting the letter instead.
UnitedHealthcare and Humana lead the retreat
UnitedHealthcare, the country’s largest Medicare Advantage insurer, is exiting Wyoming’s individual market entirely for 2027, and dropping individual Medicare Advantage coverage in about 140 counties nationwide. The company has confirmed that roughly 390,000 of its members are enrolled in plans being discontinued for 2027, with notice letters going out in early October. The cuts are landing hardest on PPOs, the plans that let members see providers outside a set network: the share of UnitedHealthcare members with access to both an HMO and a PPO is falling from 70% in 2026 to 66% in 2027 as the company steers toward narrower, cheaper-to-run HMO networks instead.
Humana is making a smaller geographic retreat but a larger one in sheer membership. The company’s 2027 plan exits will affect about 600,000 members, concentrated in specific markets rather than spread evenly: Humana is leaving the individual Medicare Advantage market in Minnesota, where it had fewer than 10,000 enrollees, while continuing to sell plans in 2,600 counties across 45 states and Washington, D.C., more than 80% of the country. For members in a discontinued plan, the size of Humana’s remaining footprint is beside the point. What matters is whether a comparable plan is still sold at their own address, and that has to be checked county by county, not state by state.
Aetna and Molina make their own cuts
Aetna is pulling standard Medicare Advantage plans from about 123 counties and leaving Maryland and New Hampshire entirely for 2027, two states where forced plan exits already ran unusually high heading into this year. The insurer is cutting 20 PPO plans from its lineup while adding 29 plans aimed at people with chronic conditions, a trade that fits the broader industry shift away from broad-network products and toward plans built around managing specific, expensive diagnoses.
Molina Healthcare’s move is simpler and more complete. The company is exiting the standard individual Medicare Advantage market nationwide for 2027, dropping the prescription-drug-included plans it sells to the general Medicare population entirely. Molina is keeping only its Dual Eligible Special Needs Plans, built for people who qualify for both Medicare and Medicaid, which the company has decided fits its core business better than competing for ordinary Medicare Advantage shoppers. Anyone in a standard Molina MAPD plan loses that coverage outright and has to replace it with something from another carrier, or with Original Medicare.
Why the exits keep happening
The underlying problem is simple to describe and hard for insurers to fix. For years, what Medicare pays private insurers to run these plans hasn’t kept pace with how fast medical costs and care utilization have climbed. CMS initially proposed a nearly flat 0.09% average payment increase for 2027 in January, worth about $700 million industry-wide and far below the 5%-plus bump insurers received heading into 2026. That proposal alone wiped tens of billions of dollars off health insurer stock values in a single day.
CMS reversed course in April and finalized a payment increase of nearly 5% for 2027, worth roughly $26 billion in additional payments nationally, well before insurers locked in the 2027 bids they submitted that June. The healthier number didn’t reverse the plan exits already underway. After a stretch of years in which medical costs climbed faster than government payments, insurers are using 2027 to permanently narrow their networks toward HMOs and special needs plans, which cost less to run than the broad-access PPOs behind much of this year’s cuts. One decent rate year doesn’t undo a strategic shift that’s already in motion, and it doesn’t make a money-losing county profitable again on its own.
Shop the plans still standing in your county
If your plan is ending, the first move is also the most obvious one, and it’s the one people skip because the old plan worked fine and shopping for insurance is nobody’s idea of a good afternoon. Medicare’s Plan Finder tool at Medicare.gov lets you search every Advantage plan sold at your address, compare premiums and out-of-pocket maximums side by side, and see which plans include drug coverage without a separate Part D purchase. The regular Annual Enrollment Period runs October 15 through December 7, and anything you choose during that window takes effect January 1.
Don’t assume the replacement plan your insurer nudges you toward, sometimes called a crosswalk plan, is actually your best option. Insurers often default displaced members into whatever plan is closest on paper to the one that’s ending, and it is frequently not the cheapest or most generous choice available in that county. Run the comparison yourself, or call 1-800-MEDICARE and have someone walk you through it, before an automatic reassignment makes the decision for you.
Confirm your doctors and prescriptions actually transfer
A plan that looks identical to your old one on a premium comparison chart can still run on a completely different network of doctors and hospitals, and Medicare Advantage plan directories are notoriously unreliable about who’s actually still accepting new patients. Call your doctor’s billing office directly and ask whether they’re in-network for the specific plan you’re considering, not just the insurance company generally. The same caution applies to specialists and to any hospital system you’d use for a planned procedure.
Prescriptions deserve the same scrutiny. Run every medication you currently take through the plan’s formulary before you enroll, because drug tiers and prior authorization rules shift from plan to plan even within the same insurer’s lineup, and a drug that cost you little this year can jump tiers in a new plan without warning. If you’re switching to Original Medicare instead of another Advantage plan, you’ll need a standalone Part D plan to cover prescriptions, since Original Medicare alone doesn’t include drug coverage at all.
The guaranteed-issue window almost nobody mentions
Here’s the protection buried in the fine print: when a Medicare Advantage plan leaves Medicare or stops covering your area, federal law gives you a guaranteed-issue right to buy a Medigap policy without medical underwriting. Normally, insurers can deny you a Medigap policy or charge you more because of your health history unless you’re inside your one-time, six-month Medigap enrollment window right after turning 65. A plan termination reopens that door, but only if you move to Original Medicare as your replacement rather than enrolling in a different Advantage plan.
The window is narrow and worth marking on a calendar: you can apply as early as 60 days before your old coverage ends and as late as 63 days after it ends, though your new Medigap coverage can’t actually start until the old Advantage plan’s coverage has stopped. For someone with a health condition that would normally get a Medigap application denied or priced out of reach, this is one of the only chances that ever comes along to buy that protection on fair terms. It’s worth pricing out even if you’re currently leaning toward another Advantage plan instead, just to know what you’d be giving up.
What happens if you let the deadline pass
Doing nothing is itself a decision, and it’s the worst one available. If your terminated plan’s coverage runs through December 31 and you haven’t chosen anything by then, you’re automatically moved into Original Medicare on January 1, with no prescription drug coverage and no Medigap policy attached. Original Medicare alone has no annual cap on what you could owe out of pocket, a protection your old Advantage plan almost certainly included.
The regular Annual Enrollment Period closes December 7, but losing your plan to a non-renewal buys you extra time most people don’t realize they have: a Special Enrollment Period runs from December 8 through the last day of February, specifically for people whose plan didn’t renew. Use the extra weeks if you need them to compare options properly, but don’t treat them as an excuse to drift into January with no drug coverage in place. Pick a direction, enroll in it, and confirm the effective date before the calendar makes the choice for you.
None of this makes the letter in your mailbox any less annoying to deal with. It does mean you have more room to maneuver than the letter lets on, and a deadline that, used properly, works in your favor instead of against it.
