According to CPT, what type of procedure is coded when an endoscopy is conducted to the level of the midtransverse colon?

When coding a procedure involving an endoscopy to the level of the mid-transverse colon, the correct answer is a colonoscopy. A colonoscopy is a diagnostic procedure that allows a physician to examine the entire colon, which includes the rectum and the entirety of the colon up to the cecum, conveniently allowing for visualization beyond the mid-transverse colon.

In contrast, a sigmoidoscopy is limited to the examination of the sigmoid colon and rectum, which means it does not extend as far as the mid-transverse colon. Gastroscopy focuses on the upper gastrointestinal tract, including the esophagus, stomach, and duodenum, and is not applicable for procedures in the colon. Similarly, a duodenoscopy pertains to the examination of the duodenum, part of the small intestine, making it irrelevant for procedures involving the colon.

Thus, the term colonoscopy applies specifically to procedures that involve the exploration of the colon, accurately reflecting the level of examination described in the question.