2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Genitourinary System 580-629 > Other Diseases Of Urinary System 590-599 > 2006 ICD-9-CM Diagnosis 591 Hydronephrosis View the most recent version of ICD-9-CM 591 A distention of the pelvis and calices of the kidney with urine, as a result of obstruction of the ureter, with accompanying atrophy of the parenchyma of the organ. Abnormal enlargement of a kidney, which may be caused by blockage of the ureter (such as by a kidney stone) or chronic kidney disease that prevents urine from draining into the bladder. 591 is a specific code that can be used to specify a diagnosis 591 contains 19 index entries Alternate Terminology Hydrocalycosis Hydronephrosis Hydroureteronephrosis 591 Excludes congenital hydronephrosis (753.29) hydroureter (593.5)  Index entries containing 591: Atrophy, atrophic hydronephrosis 591 kidney (senile) (see also Sclerosis, renal) 587 hydronephrotic 591 Contraction, contracture, contracted kidney (granular) (secondary) (see also Sclerosis, renal) 587 hydronephritic 591 Cyst (mucus) (retention) (serous) (simple) kidney (congenital) 753.10 calyceal (see also Hydronephrosis) 591 pyelogenic (see also Hydronephrosis) 591 Hydrocalycosis (see also Hydronephrosis) 591 congenital 753.29 Hydrocalyx (see also Hydronephrosis) 591 Hydronephrosis 591 atrophic 591 congenital 753.29 due to S. hematobium 120.0 early 591 functionless (infected) 591 infected 591 intermittent 591 primary 591 secondary 591 tuberculous (see also Tuberculosis) 016.0 Hydroureteronephrosis (see also Hydronephrosis) 591 Infection, infected, infective (opportunistic) 136.9 hydronephrosis 591 Pelvioectasis 591 Pyelohydronephrosis 591