Question: What CPT® code is used when a doctor does a ureteroscopy through an ileal conduit? Missouri Subscriber Answer: Your best option is 52351 (Cystourethroscopy, with ureteroscopy and/or pyeloscopy; diagnostic). As explanatory notes in CPT® explains, "Since, the ileum serves as functional replacement of a native bladder, the procedure can be captured using the cystourethroscopy codes."