When performing a screening colonoscopy, we usually use the dx code Z12.11, screening for malignant neoplasm of the colon. I was just asked why wouldn’t we also use Z12.12, screening for malignant neoplasm of the rectum? I’m assuming, but could be wrong, that you would only need Z12.11, as the screening of the colon includes the rectum. (but it doesn’t actually specify this in the description) What are your thoughts? Have you ever had a provider bill a colonoscopy with both Z12.11 and Z12.12?