A patient underwent endoscopic right maxillary antrostomy. Report CPT code(s) _____. 31256-RT. Acute and chronic laryngitis. Report code(s) _____. 464.00, 476.0. Bilateral sinus endoscopy performed with partial resection of ethmoid. Report CPT code(s) _____. ... The physician inserts a flexible scope into the patient's rectum and determines ....