Medicare 2026

Medigap and the 2026 Annual Enrollment Period: What Actually Applies to Your Supplement

Every fall, as the Medicare Annual Enrollment Period approaches, people reasonably assume it's the time to make every Medicare decision at once — including anything involving a Medicare Supplement (Medigap) policy. It's an understandable assumption, but it's not quite how the rules work. Medigap runs on its own track, with its own windows and its own protections. Here's a plain-English look at what you can and cannot do with Medigap during the Annual Enrollment Period that runs October 15 through December 7, 2026, for coverage that begins January 1, 2027.

What Annual Enrollment is actually for

The Annual Enrollment Period (sometimes called Open Enrollment, though that term also gets used for a different Medigap window — more on that below) is the fall window when people with Medicare can:

• Join, switch, or drop a Medicare Advantage plan.
• Join, switch, or drop a stand-alone Part D prescription drug plan.
• Return from Medicare Advantage to Original Medicare.

Those changes take effect January 1, 2027. That's the scope of this window. It is not, by itself, a Medigap enrollment period.

Why Medigap is different

Medigap is private insurance that works alongside Original Medicare (Parts A and B) to help pay some of the out-of-pocket costs Original Medicare leaves behind. Under federal law, Medigap plans sold to people newly eligible are standardized by letter — Plans A, B, D, G, K, L, M, and N. Plans C and F are closed to anyone newly eligible for Medicare on or after January 1, 2020. Massachusetts, Minnesota, and Wisconsin standardize their Medigap plans differently, and some states add consumer protections of their own (for example, "birthday rules" that allow certain switches once a year). Those state-level rules vary and are worth verifying for where you live.

Here's the key point: you can apply for a Medigap policy at any time of the year. There's no "season" for it. But whether an insurer must accept you — and at what price — depends on whether you have a guaranteed-issue right at the moment you apply. Outside of those protected situations, the insurer can use medical underwriting, which means your health history can affect whether you're approved and what you'll pay.

The one guaranteed window most people get

For most people, the single strongest Medigap protection is the six-month Medigap Open Enrollment Period that starts the month you are 65 or older and enrolled in Part B. During that window, you can buy any Medigap policy sold in your state, and the insurer cannot deny you or charge you more because of health conditions. This window happens once. If you miss it, you may still be able to buy a policy later, but typically only under medical underwriting unless a guaranteed-issue right applies.

Guaranteed-issue rights in specific situations

Federal law also creates guaranteed-issue rights in certain circumstances. A couple of common examples:

• If your Medicare Advantage plan leaves Medicare or stops serving your area, you generally have a window that starts 60 days before coverage ends and ends 63 days after to buy certain Medigap plans without medical underwriting.
• If you joined Medicare Advantage when you first became eligible for Medicare and want to switch back to Original Medicare within the first 12 months, you may have a "trial right" to buy a Medigap policy on a guaranteed-issue basis.

There are additional federal guaranteed-issue scenarios, and some states offer broader rights. The specifics matter, so it's worth confirming your situation before applying.

If you use Annual Enrollment to leave Medicare Advantage

This is where Annual Enrollment and Medigap intersect in practice. If, between October 15 and December 7, 2026, you decide to leave a Medicare Advantage plan and go back to Original Medicare effective January 1, 2027, two things are worth planning for:

1. Drug coverage. Medigap does not cover prescription drugs. If you want prescription coverage, you'll need to enroll in a stand-alone Part D plan during that same Annual Enrollment window. 2. Medigap acceptance isn't automatic. Simply switching back to Original Medicare during Annual Enrollment does not, by itself, trigger a federal guaranteed-issue right to a Medigap policy. Depending on your circumstances and state rules, you may be subject to medical underwriting. If you're considering this move, it's wise to look into Medigap availability and the underwriting question before you drop your Advantage plan — not after.

Original Medicare + Medigap vs. Medicare Advantage: a neutral note

Both paths are legitimate and both have trade-offs. Original Medicare paired with a Medigap policy and a Part D plan tends to offer broad provider access and more predictable cost-sharing, but typically involves separate premiums for Medigap and Part D. Medicare Advantage bundles coverage, often includes drug coverage, and may offer additional benefits, but generally uses provider networks and plan-specific rules. Neither is "better" in the abstract — the right fit depends on your health, your providers, your budget, and your preferences.

A note on 2027 numbers

The 2027 Part B standard premium and deductible, and the 2027 income-related (IRMAA) thresholds, have not been announced yet. CMS typically releases those figures in the fall. Be cautious with any source that quotes specific 2027 amounts before CMS publishes them.

Where to get accurate, personalized information

Medigap rules can feel detailed because they are — federal standardization, state variations, guaranteed-issue timing, and underwriting all interact. For official information and to compare options, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227), available 24 hours a day, 7 days a week. For your Medigap questions specifically, the CMS pages on Medicare Supplement Insurance rules and on Medicare enrollment periods at medicare.gov are good starting points.

This article is for general education only. It is not affiliated with the federal government and does not rank or recommend specific plans.