Do You Need Medigap With Medicare Advantage? 
No . If you are on Medicare part C -LRB- Medicare Advantage -RRB- your Medicare Supplement will not pay anything at all . Medicare Supplements -LRB- aka : Medigap plan -RRB- are designed to pay the cc-pays and deductibles after Medicare A&B . When you are on Medicare Advantage , Parts Aabd B do not pay anything . Your supplement would be useless . 