CPT® Code 45393

Colonoscopy, flexible; with decompression (for pathologic distention) (eg, volvulus, megacolon), including placement of decompression tube, when performed

A flexible colonoscopy with decompression is a specialized procedure aimed at addressing pathologic distention of the colon, which can occur due to conditions such as volvulus or megacolon. Volvulus refers to the twisting of a segment of the intestine around its mesenteric pedicle, leading to an obstruction that results in a loop of the intestine becoming distended with feces and gas. This condition is particularly prevalent in the sigmoid colon, often arising from chronic constipation that causes the colon to become elongated and atonic, a situation also referred to as acquired megacolon. If left untreated, volvulus can result in serious complications, including tissue infarction due to compromised blood supply and potential perforation, which can lead to peritonitis. During the procedure, a standard flexible colonoscope is introduced into the rectum and advanced through the colon, allowing for thorough inspection of the mucosal surfaces from the rectum to the cecum. Air insufflation is utilized to separate the mucosal folds, enabling a detailed examination for signs of ischemia or necrosis. If the mucosa appears healthy, a flatus tube may be passed alongside the colonoscope and gently maneuvered through the twisted segment of the intestine, positioned just proximal to the obstruction. This facilitates rapid decompression, allowing the trapped liquid feces and gas to evacuate, thereby relieving the obstruction. Alternatively, a suction device may be employed to remove fluid, stool, and debris from the colon. Following the decompression, the tube is typically left in place for a duration of 24 to 48 hours to ensure continued decompression and to promote oxygenation of the previously twisted bowel wall before the colonoscope is withdrawn.