A Medicare Supplement Insurance policy (also called Medigap) adds on to Original Medicare (Part A and Part B). It helps pay for the part of health care costs that Original Medicare doesn’t cover, like copayments, coinsurance, and deductibles. After Medicare pays its share of the Medicare-approved amount for covered health costs, your Medicare Supplement Insurance policy pays its share.
You can have either Medicare Supplement Insurance or a Medicare Advantage Plan (Part C), but not both.
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Notice for persons eligible for Medicare because of disability:
In the following states, all Medicare Supplement plans are available to persons eligible for Medicare because of disability: Colorado, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Kansas, Kentucky, Louisiana, Maine, Minnesota, Mississippi, Missouri, Montana, New Hampshire, Oregon, Pennsylvania, South Dakota, Tennessee, Vermont, and Wisconsin.