Being Forced Out of a Medicare Advantage Plan Was a 1% Event for Years. In 2026 It Hit 10%. The 2027 Letters Must Arrive by October 2.

Medicare mail has a way of blending into the pile, even when it carries a deadline. A plan nonrenewal notice must reach the member by October 2, 2026. If a Medicare Advantage insurer has decided not to offer the plan in 2027, federal rules require 90 days’ notice before coverage ends December 31. The envelope is plain. The decision it forces is not.

For most of the last decade, relatively few members encountered one. Researchers from the Johns Hopkins Bloomberg School of Public Health reported in JAMA that forced Medicare Advantage disenrollment averaged about 1% annually from 2018 through 2024. It jumped to 6.9% in 2025 and reached roughly 10%, or 2.9 million people, in 2026.

The national figure hides much sharper local disruption. In Vermont, 92.2% of Advantage members were forced to find new coverage. Twelve states had rates above 20%, and seven exceeded 40%. Rural beneficiaries faced forced exits at roughly twice the rate of urban members.

A letter that was once an outlier has become part of Medicare planning for millions of households. For the person holding it, the next decision can affect what coverage remains available long after the canceled plan is gone.

The Door the Letter Reopens

A plan nonrenewal creates two separate protections. Medicare provides a Special Enrollment Period (SEP) from December 8 through the final day of February. Members who return to Original Medicare also receive a federal guaranteed-issue right to buy certain Medigap policies without medical underwriting. That means no denial or higher premium because of diabetes, a cancer history or another pre-existing condition. For someone who has already passed the initial six-month Medigap enrollment period, this may be one of the few times health history cannot stand between them and a supplement.

The application period begins 60 days before the Advantage coverage ends and continues for 63 days afterward. Plans A, B, C, D, F, G, K and L may be available, although eligibility for Plans C and F depends on when the person first became eligible for Medicare. Medigap coverage cannot begin until the Advantage plan ends. The destination matters. This protection applies when the member returns to Original Medicare, not when they choose another Advantage plan. Selecting a familiar replacement without pricing Medigap first can allow a rare opportunity to pass unused.

Two Paths, Two Different Risks

One path is another Advantage plan. The additional premium may still be $0, but the provider network, drug formulary and prior-authorization rules can all change. In 2026, an Advantage plan’s in-network medical out-of-pocket maximum can reach $9,250. Part D drug spending and some out-of-network care sit outside that ceiling. The other path is Original Medicare paired with Medigap and a standalone Part D plan. The standard $202.90 Part B premium follows the member into either system. The additional costs are the Medigap and Part D premiums.

Plan G premiums commonly run around $150 to $250 a month, although age, location, tobacco use, carrier and rating method can move the quote outside that range. After the $283 Part B deductible, Plan G covers most Part A and Part B cost-sharing. That protection includes the $1,736 Part A hospital deductible, $434 daily hospital coinsurance for days 61 through 90 and $217 daily skilled-nursing coinsurance for days 21 through 100. Prescription drugs, dental care and other services Original Medicare does not cover remain separate.

Advantage may cost less during a healthy year. Original Medicare with Plan G may provide more predictable medical spending and wider provider access during a difficult one. Neither structure wins automatically. The termination notice matters because it lets the member compare both while Medigap underwriting is temporarily off the table.

Income and IRMAA Still Apply

The income-related monthly adjustment amount (IRMAA) applies under either structure. In 2026, it begins above modified adjusted gross income (MAGI) of $109,000 for a single filer or $218,000 for a couple filing jointly. At the first tier, IRMAA adds $81.20 a month to Part B and $14.50 to Part D. At the top, the monthly additions reach $487 and $91. MAGI is adjusted gross income plus tax-exempt interest, and Medicare generally uses tax information from two years earlier. A 2024 return therefore determines the 2026 surcharge. These surcharges are one of several premium traps we mapped in a free Medicare guide.

The Envelope Please

Before enrolling anywhere, three details deserve attention:

1. Save the nonrenewal notice and confirm the coverage end date. The letter may be needed to prove the guaranteed-issue right when applying for Medigap.
2. Price Original Medicare, the available Medigap policies and Part D together before selecting another Advantage plan. The protected application period begins before the old coverage ends.
3. Compare any replacement plan’s doctors, prescriptions, authorization rules and annual spending limit. A familiar carrier name does not mean the coverage stayed familiar.

When forced exits were a 1% event, few members had reason to know this rule. At 10%, the letter is no longer administrative clutter. It is a temporary chance to choose a new structure while health history stays out of sight.

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