Question: Can you use a diagnosis Z90.79 for a postoperative TURP? Mississippi Subscriber Answer: No, that is not the best diagnosis since your surgeon only removed some tissue rather than the entire prostate. I would use either Z48.816 (Encounter for surgical aftercare following surgery on the genitourinary system) (if it was your doctor that did the surgery) or maybe Z98.890 (Other specified postprocedural states). If the urologist had performed a radical prostatectomy, diagnosis Z90.79 (Acquired absence of other genital organ[s]) would be appropriate. The postoperative diagnosis within the global period should be N40.1 (BPH and obstruction, LUTS or C61, carcinoma of the prostate gland).