CPT® Code 45309

A rigid proctosigmoidoscopy is a diagnostic and therapeutic procedure that involves the examination of the rectum and the lower part of the colon (sigmoid colon) using a rigid scope. This procedure is specifically designed for the removal of a single tumor, polyp, or other lesion utilizing a snare technique. The snare technique involves the use of a wire loop that is placed around the lesion, which is then heated to excise and cauterize the tissue simultaneously. This method is particularly effective for lesions that are accessible and can be removed in a single piece or in a piecemeal fashion, depending on the size and nature of the lesion. The procedure begins with the insertion of an obturator into the scope, which is then introduced into the anus and advanced into the rectum. Air insufflation is used to expand the rectal walls, allowing for better visualization of the mucosal surface. Once the lesion is identified, the snare is employed to remove it, ensuring that any bleeding is controlled through cauterization. This procedure is essential for both diagnostic purposes and for the treatment of conditions such as polyps, which may have the potential to develop into colorectal cancer if left untreated.