CPT® Code 45112

The procedure described by CPT® Code 45112 refers to a proctectomy that is performed as a combined abdominoperineal pull-through procedure, specifically involving a colo-anal anastomosis. This surgical intervention is typically indicated for patients with conditions affecting the rectum and lower gastrointestinal tract, necessitating the removal of the rectum while preserving the anal mucosa. The term 'proctectomy' denotes the surgical excision of the rectum, and in this case, it is performed through both abdominal and perineal approaches. The procedure involves a midline incision in the abdomen, allowing for exploration and identification of the proximal transection site, which may include a segment of the sigmoid colon. The mobilization of the sigmoid colon and rectum is crucial for the subsequent steps, which include the creation of an anastomosis between the remaining colon and the anal mucosa. This technique aims to restore bowel continuity and function after the removal of the diseased rectal tissue, ensuring that the patient can maintain normal defecation postoperatively. The careful dissection and removal of the rectum and surrounding mesentery are performed to minimize complications and facilitate a successful anastomosis, which is a critical aspect of this complex surgical procedure.