What is MEDICARE SUPPLEMENT INSURANCE?
MEDICARE SUPPLEMENT INSURANCE meaning Medicare supplement insurance is a Medigap policy. It is sold by private insurance companies to fill “gaps” in Original Medicare Plan coverage. Except in Minnesota, Massachusetts, and Wisconsin, there are 10 standardized policies labeled Plan A through Plan J. Medigap policies only work with the Original Medicare Plan. (See Gaps and Medigap Policy.)
reference: Centers for Medicare & Medicaid Services