Why Did I Get A Bill For An Endoscopy When I Have Medicare And A Supplment? 
Great question . As usual , not enough details to zero in on the exact reason WHY you received the bill . All the answers above are right . My questions/thoughts are : 1 . What Medigap plan do you have ? F -LRB- which we almost never enroll clients in - MATH dictates that -RRB- , G , K , N , or one of the other parts of the Alphabet soup . 2 . Was is just not billed or coded correctly ? 3 . Depending on the supplement Letter you have , it could be that Excess Charges were not covered ??? 4 . OR ... only an thought ... I get calls all the time from people who want to `` look for a different supplement '' when in fact they have a Medicare Advantage plan . The average person does n't distinguish between the two : Medigap & Advantage . So if you have an advantage plan , you are getting billed for the co-pay -LRB- s -RRB- . Reach out directly if you want further clarity . THANK YOU !! - gravy . 