N13: Obstructive and reflux uropathy

Codes under N13 (Obstructive and reflux uropathy). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
N13.0	Hydronephrosis with ureteropelvic junction obstruction	✓
N13.1	Hydronephrosis with ureteral stricture, not elsewhere classified	✓
N13.2	Hydronephrosis with renal and ureteral calculous obstruction	✓
N13.3	Other and unspecified hydronephrosis	—
N13.4	Hydroureter	✓
N13.5	Crossing vessel and stricture of ureter without hydronephrosis	✓
N13.6	Pyonephrosis	✓
N13.7	Vesicoureteral-reflux	—
N13.8	Other obstructive and reflux uropathy	✓
N13.9	Obstructive and reflux uropathy, unspecified	✓
N13.30	Unspecified hydronephrosis	✓
N13.39	Other hydronephrosis	✓
N13.70	Vesicoureteral-reflux, unspecified	✓
N13.71	Vesicoureteral-reflux without reflux nephropathy	✓
N13.72	Vesicoureteral-reflux with reflux nephropathy without hydroureter	—
N13.73	Vesicoureteral-reflux with reflux nephropathy with hydroureter	—
N13.721	Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral	✓
N13.722	Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral	✓
N13.729	Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified	✓
N13.731	Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral	✓
N13.732	Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral	✓
N13.739	Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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