“CMS defines a Medigap policy / Med Supplement as a supplement insurance policy sold by private insurance companies to fill “gaps” in Original Medicare Plan coverage. Except in Massachusetts, Minnesota and Wisconsin, there are 10 standardized plans labeled Plan A through Plan J. Medigap policies only work with the Original Medicare Plan.” – www.medicare.gov

“…is a federally standardized set of plans sold by insurance companies to fill the gaps in Original Medicare.”