Why Did I Get A Bill For An Endoscopy When I Have Medicare And A Supplment? 
It depends on which Medicare supplement plan you have . Many Medicare supplement have costs shares associates with them . A plan F covers 100 % but other plans such as L or K only cover a percentage of what Medicare does n't cover . You could also have a high deducible F plan which would not cover until the annual deductible has been met for the plan . Identifying which supplement you have will make it much easier to determine your coverage level 