Urolithiasis (N20-N23)

N20Calculus of kidney and ureter
› Calculous pyelonephritis
Excludes 1: nephrocalcinosis (E83.59)
› that with hydronephrosis (N13.2)

N20.0Calculus of kidney
› Nephrolithiasis NOS
› Renal calculus
› Renal stone
› Staghorn calculus
› Stone in kidney

N20.1Calculus of ureter
› Calculus of the ureteropelvic junction
› Ureteric stone

N20.2Calculus of kidney with calculus of ureter

N20.9Urinary calculus, unspecified

N21Calculus of lower urinary tract
Includes: calculus of lower urinary tract with cystitis and urethritis

N21.0Calculus in bladder
› Calculus in diverticulum of bladder
› Urinary bladder stone
Excludes 2: staghorn calculus (N20.0)

N21.1Calculus in urethra
Excludes 2: calculus of prostate (N42.0)

N21.8Other lower urinary tract calculus

N21.9Calculus of lower urinary tract, unspecified
Excludes 1: calculus of urinary tract NOS (N20.9)

N22Calculus of urinary tract in diseases classified elsewhere
Code First: underlying disease, such as:
› gout (M1A.-, M10.-)
› schistosomiasis (B65.0-B65.9)

N23Unspecified renal colic