Medicare.gov

What's Medicare Supplement Insurance (Medigap)?

Medicare Supplement Insurance (Medigap) is extra insurance you can buy from a private health insurance company to help pay your share of out-of-pocket costs in Original Medicare .

Generally, you must have Original Medicare – Part A (Hospital Insurance) and Part B (Medical Insurance) – to buy a Medigap policy.

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What do you want to do? 

Get Medigap basics

Learn what Medigap covers, how it works, and general costs.

Get ready to buy

Learn when and how to buy, switch, or drop a policy.

Already have a Medigap policy? Find out if you can change or drop your policy.