Patient with a history of gastric bypass had to have a laparoscopic gastrotomy to create access for an ERCP. This was done by 2 different surgeons; Gen Surg made the gastrotomy; GI doc did the ERCP. My Gen Surg doc wants to bill 49653 but I know that's not correct. I am thinking 43500 for the general surgeon. This was all done during the same operative session. Any coding help on this is appreciated.