Over 4 million Medicare beneficiaries face plan cancellations at year's end

If you rely on Medicare Advantage or a stand-alone Part D prescription plan, your coverage may look very different when the calendar turns. More than 4 million Medicare beneficiaries will see their current Medicare Advantage or stand-alone drug plans terminated at the end of 2026, according to a new analysis by [KFF].

For anyone managing chronic conditions or careful monthly budgets, the news comes at a critical juncture. The annual Medicare Open Enrollment period is underway and runs through December 7. If your insurer is leaving your market or dropping your specific policy, you cannot simply let your coverage roll over into the new year.

Why plans are exiting

Medicare plan offerings shift every year, but the scale of departures this season is catching many households off guard. Private insurers offering Medicare Advantage and stand-alone Part D drug plans regularly adjust their geographic footprints and benefit designs based on payment updates, regulatory requirements, and medical cost trends [KFF].

When an insurer decides a plan is no longer viable in a particular county or region, it can discontinue the plan entirely. For enrollees, this does not mean losing Medicare itself. It does mean, however, that the specific network of doctors, list of covered medications, and out-of-pocket copay structures you negotiated this year will vanish on December 31.

The risk of auto-enrollment surprises

What happens if you do nothing depends on whether you have a Medicare Advantage plan or a stand-alone drug plan [KFF].

If your stand-alone Part D plan ends, you may be automatically reassigned by the Centers for Medicare & Medicaid Services to another benchmark plan in your area—or you may be left without prescription coverage unless you choose a replacement yourself [CMS]. Even when automatic reassignment happens, the new plan may place your daily medications on a more expensive formulary tier or require prior authorization.

For those enrolled in a terminating Medicare Advantage plan, inaction generally returns you to Traditional Medicare (Parts A and B) on January 1, but without drug coverage unless you proactively sign up for a separate Part D plan. Furthermore, returning to Traditional Medicare without supplemental coverage can leave you exposed to uncapped 20% coinsurance costs.

Navigating Medigap protections

If your Medicare Advantage plan is terminating, you hold an important consumer safeguard known as "guaranteed issue rights" [KFF].

In most circumstances, older adults who try to switch from Medicare Advantage back to Traditional Medicare can be denied a Medicare Supplement (Medigap) policy or charged higher premiums based on pre-existing health conditions [KFF]. But when your Medicare Advantage plan withdraws from your area through no fault of your own, federal rules grant you a special window to buy certain Medigap policies without medical underwriting.

Exercising this right requires careful timing. You must prove your plan was discontinued, and the window to secure a policy without health screening typically lasts only a few months around the termination date.

What you should do this week

If you have not already opened every piece of mail from your insurer, do so today.

Look specifically for an "Annual Notice of Change" or a formal notice of plan non-renewal [KFF]. If your plan is terminating, do not panic, but do not wait until December.

Start by making a complete list of your current prescriptions, including dosages, along with the hospital systems and physicians you consider non-negotiable. Use the official Medicare Plan Finder tool on Medicare.gov to compare available options in your ZIP code. Entering your exact medications into the tool will calculate your true expected out-of-pocket spending across all available drug and Advantage plans, helping you find stable coverage before the December 7 open enrollment deadline.