What Is Medigap Insurance? 
Medigap or Medicare Supplement Insurance covers deductibles and coinsurance required by Medicare . Depending on the plan it will generally cover your Part A deductibles . It will also cover the 20 % of Medicare covered expenses that you would otherwise be responsible for if you did not have a supplement . It is extremely advisable for most people to select either a Medicare Supplement or a Medicare Advantage plan when qualified for Medicare . 