I work in urology and need a little help with a new surgery code concerning a graft. The surgeon was doing a urethroplasty CPT 53410 and harvested from the patient the buccal mucosa to use during the urethroplasty. The problem is that this is new to our office and the cpt 40818 states that it is "donor" and to be used on another person. While code 40819 is not as specific and does basically cover the procedure. I was wondering if there was anyone who has seen and or coded this before and could offer some guidance.