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  3. Ch. N00-N99
  4. Sec. N10-N16
  5. Category N13
Category N13

Obstructive and reflux uropathy

Clinical Classification Guidelines

Specific Diagnosis Codes

Hydronephrosis with ureteropelvic junction obstruction
N13.0
Hydronephrosis with ureteral stricture, not elsewhere classified
N13.1
Hydronephrosis with renal and ureteral calculous obstruction
N13.2
Other and unspecified hydronephrosis
N13.3
Unspecified hydronephrosis
N13.30
Other hydronephrosis
N13.39
Hydroureter
N13.4
Crossing vessel and stricture of ureter without hydronephrosis
N13.5
Pyonephrosis
N13.6
Vesicoureteral-reflux
N13.7
Vesicoureteral-reflux, unspecified
N13.70
Vesicoureteral-reflux without reflux nephropathy
N13.71
Vesicoureteral-reflux with reflux nephropathy without hydroureter
N13.72
Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral
N13.721
Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral
N13.722
Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified
N13.729
Vesicoureteral-reflux with reflux nephropathy with hydroureter
N13.73
Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral
N13.731
Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral
N13.732
Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified
N13.739
Other obstructive and reflux uropathy
N13.8
Obstructive and reflux uropathy, unspecified
N13.9
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Data updated for October 2025 release.

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