A20 year-old patient presented to the hospital with a history of bloody stools for three weeks' duration. the patient was prepped for a sigmoidoscopy. the sigmoidoscope was passed without difficulty to about 40 cm. the entire mucosal lining was erythematosus. there was no friability of the overlying mucosa and no bleeding noted. no pseudo polyps were identified. biopsies were taken at about 30 cm; these were thought to be representative of the mucosa in general. the scope was retracted; no other abnormalities were seen. what cpt® and icd-10-cm codes are reported?