I work in the billing department of a GI & Endoscopy-Driven ASC. We bill the facility claim and the physician's claim separately. Medicare HMO's consistently either deny one claim as a duplicate to the other or underpay the facility claim at the professional allowable. Then, if they do pay, a couple months down the road they try to recoup funds for duplicate payment. I appeal these issues all day long. I can't get anywhere with provider relations or customer service. Does anyone else have this problem? Am I doing something wrong? This is driving me crazy. Thanks!