Medicare supplement (Medigap) insurance can help pay some of the health care costs that original Medicare does not cover, like copayments, coinsurance, and deductibles.

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Some Medigap policies also offer coverage for services that Original Medicare doesn't cover, like medical care when you travel outside the U.S. If you have Original Medicare and you buy a Medigap policy, Medicare will pay its share of the Medicare-approved amount for covered health care costs. Then your Medicare supplement insurance policy pays its share.

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A Medigap policy is different from a Medicare Advantage Plan. Those plans are ways to get Medicare benefits, while a Medigap policy only supplements your Original Medicare benefits.