We have a physician who is acting as the "1st assist" physician for cases. It was my understanding for 2 phy's to bill for a sx case there needs to be evidence of "no available resident to assist, complicated case. Does anyone know what is to be considered the required documentation and which part of the chart does it need to be in....(op report, medical chart, HCFA etc). In the event of an audit where would they be looking for this documentation? Thanks for any help!!