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 N20-N23)=

N20 Calculus of kidney and ureter

 * Calculous pyelonephritis
 * Excludes1: nephrocalcinosis (E83.5)
 * that with hydronephrosis (N13.2)
 * N20.0 Calculus of kidney
 * Nephrolithiasis NOS
 * Renal calculus
 * Renal stone
 * Staghorn calculus
 * Stone in kidney
 * N20.1 Calculus of ureter
 * Ureteric stone
 * N20.2 Calculus of kidney with calculus of ureter
 * N20.9 Urinary calculus, unspecified

N21 Calculus of lower urinary tract

 * Includes: that with cystitis and urethritis
 * N21.0 Calculus in bladder
 * Calculus in diverticulum of bladder
 * Urinary bladder stone
 * Excludes2: staghorn calculus (N20.0)
 * N21.1 Calculus in urethra
 * Excludes2: calculus of prostate (N42.0)
 * N21.8 Other lower urinary tract calculus
 * N21.9 Calculus of lower urinary tract, unspecified
 * Excludes1: calculus of urinary tract NOS (N20.9)

N22 Calculus of urinary tract in diseases classified elsewhere

 * Code first underlying disease, such as:
 * gout ( M1a-, M10.-)
 * schistosomiasis (B65.0-B65.9)

N23 Unspecified renal colic
=Other disorders of kidney and ureter (N25-N29)=
 * Excludes2: disorders of kidney and ureter with urolithiasis (N20-N23)

N25 Disorders resulting from impaired renal tubular function

 * Excludes1: metabolic disorders classifiable to E70-E90
 * N25.0 Renal osteodystrophy
 * Azotemic osteodystrophy
 * Phosphate-losing tubular disorders
 * Renal rickets
 * Renal