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 | ✓ |
| N13.0 | Hydronephrosis with ureteropelvic junction obstruction | ✓ |
| N13.1 | Hydronephrosis with ureteral stricture, not elsewhere classified | ✓ |
| N13.1 | Hydronephrosis with ureteral stricture, not elsewhere classified | ✓ |
| N13.2 | Hydronephrosis with renal and ureteral calculous obstruction | ✓ |
| N13.2 | Hydronephrosis with renal and ureteral calculous obstruction | ✓ |
| N13.3 | Other and unspecified hydronephrosis | — |
| N13.3 | Other and unspecified hydronephrosis | — |
| N13.4 | Hydroureter | ✓ |
| N13.4 | Hydroureter | ✓ |
| N13.5 | Crossing vessel and stricture of ureter without hydronephrosis | ✓ |
| N13.5 | Crossing vessel and stricture of ureter without hydronephrosis | ✓ |
| N13.6 | Pyonephrosis | ✓ |
| N13.6 | Pyonephrosis | ✓ |
| N13.7 | Vesicoureteral-reflux | — |
| N13.7 | Vesicoureteral-reflux | — |
| N13.8 | Other obstructive and reflux uropathy | ✓ |
| N13.8 | Other obstructive and reflux uropathy | ✓ |
| N13.9 | Obstructive and reflux uropathy, unspecified | ✓ |
| N13.9 | Obstructive and reflux uropathy, unspecified | ✓ |
| N13.30 | Unspecified hydronephrosis | ✓ |
| N13.30 | Unspecified hydronephrosis | ✓ |
| N13.39 | Other hydronephrosis | ✓ |
| N13.39 | Other hydronephrosis | ✓ |
| N13.70 | Vesicoureteral-reflux, unspecified | ✓ |
| N13.70 | Vesicoureteral-reflux, unspecified | ✓ |
| N13.71 | Vesicoureteral-reflux without reflux nephropathy | ✓ |
| N13.71 | Vesicoureteral-reflux without reflux nephropathy | ✓ |
| N13.72 | Vesicoureteral-reflux with reflux nephropathy without hydroureter | — |
| N13.72 | Vesicoureteral-reflux with reflux nephropathy without hydroureter | — |
| N13.73 | Vesicoureteral-reflux with reflux nephropathy with hydroureter | — |
| N13.73 | Vesicoureteral-reflux with reflux nephropathy with hydroureter | — |
| N13.721 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral | ✓ |
| N13.721 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral | ✓ |
| N13.722 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral | ✓ |
| N13.722 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral | ✓ |
| N13.729 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified | ✓ |
| N13.729 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified | ✓ |
| N13.731 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral | ✓ |
| N13.731 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral | ✓ |
| N13.732 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral | ✓ |
| N13.732 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral | ✓ |
| N13.739 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified | ✓ |
| N13.739 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code N13?
N13 is an ICD-10-CM category covering Obstructive and reflux uropathy. It contains 44 more specific diagnosis codes, 36 of which are billable.
Is N13 a billable code?
No — N13 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example N13.0 — Hydronephrosis with ureteropelvic junction obstruction). 36 of the 44 codes under N13 are billable.
What codes fall under N13?
N13 includes N13.0, N13.0, N13.1, N13.1, N13.2, plus 39 more. See the full list with descriptions and billable status above.
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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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