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A Medicare supplement (Medigap) insurance, sold by private companies, can help pay some of the health care costs that Original Medicare doesn't cover, like co-payments, coinsurance, and deductibles.

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 Medigap policy pays its share.

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CARRIERS

UnitedHealthcare

Continental/Aetna

Cigna Health and Life 

Loyal American Life-Cigna

Mutual of Omaha

United American

Medigap Blue

Aflac/Aetna

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