Why Should I Buy A Medigap Policy? 
Medigap plans cover the gaps in cost that Original Medicare -LRB- Medicare Parts A & B -RRB- does not cover . Medicare Part A & Part B only cover about 80 % of a senior 's health care expenses , leaving the insured responsible for the other 20 % . While 20 % does n't sound like a very big figure , it can add up to a nice big medical bill really fast . For example , if you had a procedure done that cost $ 10,000 and Medicare paid for 80 % -LRB- $ 8,000 -RRB- , you would be responsible for the other $ 2,000 of the bill - how many people can just get out their checkbook and write a check for that amount ? That number can be a lot higher too . The idea of a Medigap Plan is to cover the gaps in coverage that Medicare does n't pay for -LRB- all or a portion of that other 20 % , depending on which Medigap plan you have -RRB- . You pay a monthly premium to get these gaps covered so you 're not hit with large bills . The resulting major advantage is it limits the expenses a senior can be exposed to by creating a very predictable health care expense structure - and when you 're on a fixed income , this is vital . A plan F is the most comprehensive Medigap plan available in the marketplace today - plans C , G , and N are very competitive as well . I hope the information is helpful - please feel free to contact me for assistance with your Medigap coverage and if you have any other questions . Thanks very much . 