What Does Medicare Gap Insurance Cover? 
Medicare gap insurance , Medicare supplement insurance , Medigap ... all the same . Like Kleenex and tissue , the terms are interchangeable . Medigap plan F is the easiest to explain . It covers everything approved by Medicare Part A and Part B but not paid by Medicare . Plan F covers deductibles , copay 's , coinsurance . Other plans -LRB- A - N -RRB- cover something less than F but most are comprehensive . Plan F is the most popular , purchased by about half of those who buy Medicare supplement plans . Plan G is next followed by plan N . The other plans are considerably less popular . 