Question: A patient comes in for screening colonoscopy that turns therapeutic. Could you clarify the diagnosis codes, and the order which I should use them? Tennessee Subscriber Answer: On cases of screening colonoscopy turning therapeutic, you should report V76.51 (Screening malignant neoplasms colon) as the first diagnosis, and 211.3 (Benign neoplasm colon) as the second. This is the correct ordering of codes according to more recent Medicare advice, although it was reversed in the past. Why: