A Medicare Supplement Insurance (Medigap) policy helps pay some of the health care costs that Original Medicare doesn't cover, like:
Medigap policies are sold by private companies.
Some Medigap policies also cover 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, here's what happens:
8 things to know about Medigap policies
Medigap policies don't cover everything
Medigap policies generally don't cover Long-term care, vision or dental care, hearing aids, eyeglasses, or private-duty nursing.