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Open Enrollment Calculator

Find your 6-month Medigap open enrollment window, the one time insurers can't deny you or charge more for health reasons.

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Your open-enrollment window
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Educational estimate. Premiums vary by insurer, age, location and rating method.

How it works

Your Medigap Open Enrollment Period is the 6 months starting when your Medicare Part B begins. We compute the exact window from your Part B start.

This window is everything: miss it and insurers can deny you or raise your rate for health reasons.

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The one window that can’t be reopened

For six months starting when your Part B begins, you have a guaranteed right to buy any Medigap plan at the best price, regardless of your health. After it closes, insurers in most states can make you answer health questions and can deny you or charge more. This single window is why timing your Medigap purchase matters more than almost any other Medicare decision.

Good to know

FAQs

When is Medigap open enrollment?

The 6 months beginning the month your Part B coverage starts (and you're 65+).

Why does it matter so much?

It's the only guaranteed-issue window — no medical underwriting, no denials.

What if I miss it?

Insurers can use medical underwriting to deny coverage or charge more.

Is this official?

No — confirm your dates at Medicare.gov.