N13
⚠ Non-billable (Header)Obstructive and reflux uropathy
Diseases of the genitourinary system (N00-N99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
⚠️ Excludes2
directMay be coded together if both conditions coexist
- • calculus of kidney and ureter without hydronephrosis (N20.-)
- • congenital obstructive defects of renal pelvis and ureter (Q62.0-Q62.3)
- • hydronephrosis with ureteropelvic junction obstruction (Q62.11)
- • obstructive pyelonephritis (N11.1)
Child Codes (10)
N13.0Hydronephrosis with ureteropelvic junction obstructionN13.1Hydronephrosis with ureteral stricture, not elsewhere classifiedN13.2Hydronephrosis with renal and ureteral calculous obstructionN13.3Other and unspecified hydronephrosisN13.4HydroureterN13.5Crossing vessel and stricture of ureter without hydronephrosisN13.6PyonephrosisN13.7Vesicoureteral-refluxN13.8Other obstructive and reflux uropathyN13.9Obstructive and reflux uropathy, unspecified
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CodeN13
BillableNo — Header code
CategoryDiseases of the genitourinary system (N00-N99)
Excludes10 rule(s)
Excludes24 note(s)
Child codes10
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)