Patient was given anesthesia prior to surgery and then developed tachycardia and hypotension. Surgery was then cancelled-since anesthesia was administered I coded 31624 with Mod 74 for facility and Mod 53 for physician pro fee. Billing has contacted me and said Medicare is rejecting the pro fee but they will send them medical records. My question is should I have coded the surgery at all? Patient then had a successful bronchoscopy a week later. I know from all my coding notes that if surgery is started, you may charge for it with a modifier stating cancelled surgery. Just doubting myself but I would like some input on this for future reference.