If a transabdominal colonoscopy via colostomy and/or standard sigmoidoscopy or colonoscopy is performed as a necessary part of an open procedure (e.g., colectomy), the endoscopic procedure(s) is (are) not separately reportable. However, if either endoscopic procedure is performed as a diagnostic procedure upon which the decision to perform the open procedure is made, the endoscopic procedure may be reported separately. Modifier 58 may be utilized to indicate that the diagnostic endoscopy and the open procedure were staged or planned services. (CPT code 45355 was deleted January 1, 2015.)