What Is Plan F For Medicare? 
Plan F also referred to as the Cadillac plan offers the most complete coverage out of the 10 available Medigap plans . Plan F is the most popular Medicare Supplement because you have no out-of-pocket cost because it covers all the gaps -LRB- deductibles , co-insurance and co-pays -RRB- in your Medicare Part A and Part B coverage . Because it offers the most complete coverage Plan F is the most expensive Medicare Supplement and usually will experience the largest rate increase . Most people on Medicare would be better served by having a Plan G or Plan N . 