The phone rang at 7:15 on a Monday morning last October. Before I could finish saying hello, the voice on the other end said, "Ben, I got a letter saying my plan is gone. What do I do?"
She was a 72-year-old retired librarian from Stamford who had been on the same Medicare Advantage plan for five years. Good plan. Covered her cardiologist, her prescriptions, her annual eye exams. And just like that, the insurance company pulled out of Fairfield County.
She is not alone. Industry analyses estimate that roughly 3 million Medicare Advantage enrollees face involuntary disenrollment in 2026, a dramatic increase from previous years. If you're holding a termination letter, or you already received one and haven't acted yet, what you do before the remaining deadlines will determine your healthcare costs for the entire year. Possibly longer.
I've been a financial planner for 35 years, and I've guided hundreds of clients through Medicare decisions. What I can tell you is this: the situation is serious, but it is fixable if you act before the deadlines pass.
Why Your Medicare Advantage Plan Disappeared
Medicare Advantage plans are not permanent. They're year-to-year contracts between private insurers and the Centers for Medicare & Medicaid Services. An insurer can exit any county, in any state, at the end of any contract year. They don't need your permission. They barely need a reason.
But there are reasons. CMS announced a 5.06% average rate increase for 2026, which sounds generous until you understand what happened underneath. New CMS risk adjustment rules cracked down on diagnostic upcoding (the practice of inflating patient risk scores to collect higher payments). Plans relying on that revenue suddenly found their margins squeezed. CMS also added stricter requirements for prior authorization transparency and provider directory accuracy, which increased administrative costs.
What followed has been an exodus. UnitedHealthcare, Humana, and Aetna/CVS Health have all pulled out of dozens to hundreds of counties, collectively affecting millions of enrollees. These aren't small regional carriers. These are the three largest Medicare Advantage insurers in the country.
So no, you didn't do anything wrong. Your plan didn't drop you because of your health. Business math changed. Cold comfort, I know.
The Deadlines You Cannot Miss
Pay close attention here, because missing a single deadline can cost you thousands of dollars. In some cases, the penalty lasts for life.
Fall Open Enrollment (October 15 – December 7): The main window. You can switch to a different Medicare Advantage plan, drop MA and return to Original Medicare, or add a standalone Part D drug plan. Changes take effect January 1.
Special Enrollment Period for terminated plans (December 8 – February 28): If your plan was terminated (not just modified, but actually ended), you qualify for a Special Enrollment Period. Extra time, but not much.
Medicare Advantage Open Enrollment (January 1 – March 31): During this window, you can make one change to your MA coverage. Switch to a different MA plan or drop MA for Original Medicare plus Part D. One change. That's it.
The 63-day Medigap window: Almost nobody knows about this one. If your MA plan ends and you return to Original Medicare, you have guaranteed-issue rights to buy a Medigap supplemental policy. No medical underwriting, no health questions, no denial for pre-existing conditions. That window is 63 days from the date your MA coverage ends. For most people whose plans terminate on December 31, the deadline falls around March 4. Miss it, and insurers can charge you 200-300% more based on your health history. Or deny you outright.
I had a client, a 69-year-old retired engineer and his wife from Greenwich, who waited until February to start looking at Medigap plans after their MA plan was terminated. They assumed they had plenty of time. By the time they'd gathered quotes, compared options, and submitted applications, the wife's deadline had passed by six days. Six days. Her premium came in $187 per month higher than his, for identical coverage, because she had a history of high blood pressure. Over ten years, that's $22,440 in extra premiums. For six days of delay.
Write these dates down and put them on your refrigerator. Set phone alarms.
Your Four Options, Explained
When your Medicare Advantage plan ends, you're not left with nothing. You have four paths forward, and each one fits a different situation. Let me walk through them with the specific numbers.
Option 1: Enroll in a different Medicare Advantage plan. Go to medicare.gov/plan-compare and enter your zip code, your doctors, and your medications. You'll see every MA plan available in your area. Check the provider network carefully. Not just your primary care doctor, but your specialists, your preferred hospital, and your pharmacy. Look at the maximum out-of-pocket limit. For 2026, the CMS-mandated cap on in-network MOOP is $9,250. Some plans set it lower. A $0 premium plan with a $9,250 MOOP is a very different value proposition than a $45/month plan with a $3,500 MOOP. Most people only discover the difference when they're in the hospital.
Option 2: Return to Original Medicare with a standalone Part D plan. Original Medicare means Part A (hospital coverage, usually premium-free) and Part B (outpatient coverage, $202.90/month in 2026, with a $283 annual deductible). You pay 20% coinsurance on most Part B services with no annual cap. Read that sentence again. No cap. If you have a $200,000 surgery, your 20% share is $40,000. You'll also need a separate Part D prescription drug plan. For 2026, the maximum Part D deductible is $615, and the new out-of-pocket cap under the Inflation Reduction Act is $2,000.
Option 3: Original Medicare plus a Medigap policy plus Part D. This is Option 2 with a safety net. Medigap plans (also called Medicare Supplement plans) cover some or all of the gaps in Original Medicare. Plan G and Plan N are the most popular choices. Plan G covers everything except the Part B deductible ($283/year), which means your out-of-pocket exposure for Medicare-covered services is essentially capped at $283. Plan N is similar but includes small copays ($20 for office visits, up to $50 for ER visits that don't result in admission). Medigap premiums run $100 to $400-plus per month depending on your age, location, and whether you're buying during your guaranteed-issue period. If your MA plan was terminated, you have those GI rights. Use them.
A retired postal worker's wife I worked with in 2018 enrolled in the wrong Part D plan because the premium was $22 per month cheaper. Reasonable thinking. But her three prescriptions weren't on the plan's formulary. They were either excluded entirely or placed on Tier 4 instead of Tier 2. Out-of-pocket difference over 12 months: $4,100. We eventually got her moved through a Special Enrollment Period exception, but it took 11 weeks and four calls to CMS. Check the formulary. Every medication. Every dosage.
Option 4: Do nothing. If your MA plan ends and you take no action, you'll automatically revert to Original Medicare. But without Part D drug coverage. No prescription benefit. And the penalty follows you forever: for every month you go without creditable drug coverage, Medicare adds a late enrollment penalty of 1% of the national base premium ($38.99 in 2026) per month, permanently. Twelve months without coverage adds $4.68 per month to your Part D premium for the rest of your life. It doesn't sound like much until you multiply it by 20 years: $1,123 in penalties for doing nothing.
Do not choose Option 4.
How to Get Free Help
There are people whose entire job is helping families through this, and you do not have to pay anyone for their help.
Every state has a State Health Insurance Assistance Program, or SHIP. These are federally funded, locally run counseling services with trained volunteers who specialize in Medicare. They're free. They're unbiased. They don't sell insurance. Find yours at shiphelp.org or call 1-877-839-2675.
You can also call 1-800-MEDICARE (1-800-633-4227), available 24 hours a day, 7 days a week. TTY users: 1-877-486-2048. And the Medicare Plan Finder at medicare.gov will let you compare every plan available in your area side by side.
A 45-minute call to SHIP can save you more money than I've saved some people in a year of financial planning. Not an exaggeration!
Five Mistakes That Cost Seniors Thousands
In my experience, the financial damage from a plan termination rarely comes from the termination itself. It comes from the response.
1. Letting auto-assignment happen without reviewing it. Some terminated plan members get automatically enrolled in a new plan by their former insurer. Sometimes the replacement plan is fine. Sometimes it excludes your doctor, doesn't cover your medications, or has a maximum out-of-pocket limit $5,000 higher than your old plan. Never assume the replacement is adequate. Verify everything.
2. Choosing a plan based on premium alone. A $0 monthly premium is attractive. Obviously. But if the plan's MOOP is $9,250 and you end up needing surgery, that $0 premium was an illusion. I'd rather pay $45 per month ($540/year) for a plan with a $3,500 MOOP. Math isn't complicated here. It's the behavior that trips people up.
3. Not checking the formulary. Your medication on Tier 2 at $15 per month in one plan might sit on Tier 4 at $100-plus in another. Multiply the difference across three or four prescriptions and twelve months. I've seen $3,000 to $5,000 annual swings on drug costs alone between plans in the same zip code.
4. Missing the 63-day Medigap guaranteed-issue window. I covered this above, but it bears repeating. After that window closes, insurers in most states can use medical underwriting. Premiums can double or triple. Actually, that's not quite right — what I mean is they can outright deny you coverage in some states. The window matters more than almost any other deadline in this process.
5. Ignoring IRMAA. If your modified adjusted gross income exceeds $106,000 (single) or $212,000 (married filing jointly), you'll pay higher premiums for both Part B and Part D. These income-related monthly adjustment amounts are based on your tax return from two years ago. Sold a house in 2024? Took a large Roth conversion? You might be in for a surcharge you didn't expect. There's an appeal process (SSA-44 form), but you need to know to file it.
My father Arthur was the most stubborn man I've ever known — and I say that with love. When his Medicare Advantage plan changed networks in 2015, he insisted on keeping it because "I've had this plan for years and I'm not switching." He spent four months driving 45 minutes each way to an out-of-network cardiologist and paying full price for visits that used to cost him a $20 copay. We finally moved him to a new plan in January. Total cost of his stubbornness: roughly $2,800 and a lot of unnecessary driving.
What This Looks Like in Practice
Three people, three situations, three different right answers.
Scenario 1: Healthy 68-year-old, two generic medications, sees one primary care doctor. Another Medicare Advantage plan is probably your best bet. Use Plan Finder, confirm your doctor is in-network, verify your generics are on formulary at Tier 1 or 2, and check the MOOP. This should take an afternoon.
Scenario 2: 74-year-old with Type 2 diabetes, heart disease, three specialists, six prescriptions. Original Medicare plus Medigap Plan G plus a standalone Part D plan. You need the freedom to see any doctor who accepts Medicare (and the vast majority of physicians do), and you need the financial protection of Medigap's cost-sharing coverage. Your monthly costs will be higher (figure $202.90 for Part B, $150-300 for Medigap, and $30-80 for Part D), but your exposure to catastrophic costs drops dramatically. For someone managing multiple chronic conditions, predictability is worth more than a low premium.
Scenario 3: 71-year-old with limited income, possibly eligible for Extra Help. If your income is below 150% of the federal poverty level, you may qualify for Medicare's Extra Help program, which covers most Part D costs. You may also qualify for a Medicaid-linked benefit in your state. Most people don't know this: Extra Help recipients have a monthly Special Enrollment Period, meaning you can change your Part D plan at any time, not just during open enrollment. Contact your state Medicaid office or call 1-800-MEDICARE to check eligibility.
Your Next Seven Days
Not next month. This week.
- Find your termination letter. Read every word. Note the effective date your coverage ends.
- Make a list. Every doctor, specialist, pharmacy, and prescription, including dosage and quantity.
- Go to medicare.gov/plan-compare. Enter your information and compare at least three plans. Print the results.
- Call SHIP at 1-877-839-2675. Schedule a counseling session. These fill up fast during enrollment season!
- If you're considering Original Medicare, request Medigap quotes immediately. Don't wait until you've "decided." The 63-day clock is already running.
- Check your income against the IRMAA thresholds. If you had unusual income in 2024, gather documentation for an appeal.
- Enroll before your deadline. Not the day of. Before. Systems crash. Websites time out. Phone hold times during enrollment season can exceed two hours.
And if you're getting phone calls from people claiming they can "fix" your Medicare problem for a fee, hang up. Every enrollment season brings a wave of Medicare scams targeting seniors. Legitimate Medicare help is always free.
The people who come through these transitions well aren't the ones with the most money or the best understanding of federal regulations. They're the ones who picked up the phone and asked for help before the deadline passed. Your regular preventive checkups matter. Your coverage matters just as much.
You've handled harder things than a plan termination letter. But don't handle this one alone.
