This CPB has been revised to state magnetic resonance cholangiopancreatography is considered medically necessary for the following indications: 1) postsurgical surveillance of intraductal papillary mucinous neoplasm of the pancreas (IPMN); or 2) preoperative evaluation of the common bile duct prior to laparoscopic cholecystectomy in persons with elevations of their transaminases or common bile duct dilatation on ultrasound.