Question: California Subscriber Answer: In the past, when the surgeon performed a urethroplasty and used a graft fashioned from buccal mucosa-- meaning the removal of the lining of the mouth to make a graft -- you would report 40818 (Excision of mucosa of vestibule of mouth as donor graft) for the graft excision. "However, in June 2011, the American Urological Association (AUA) Coding Hotline stated that instead of using 40818 for the graft, you should now use CPT® code 20926, (Tissue grafts, other [eg, paratenon, fat, dermis]) or CPT® code 15240 (Full thickness graft, free, including direct closure of donor site, forehead, cheeks, chin, mouth, neck, axillae, genitalia, hands, and/or feet; 20 sq cm or less)," says Michael A. Ferragamo, MD, FACS, clinical assistant professor of urology at the State University of New York at Stony Brook.