ICD-10-CM > N00-N99 > N20-N23 > N20 N20 Calculus of kidney and ureter Non-Billable/Non-Specific Applicable To Calculous pyelonephritis Type 1 Excludes nephrocalcinosis (E83.59)that with hydronephrosis (N13.2) Codes N20.0Calculus of kidneyN20.1Calculus of ureterN20.2Calculus of kidney with calculus of ureterN20.9Urinary calculus, unspecified