N13.731 Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral

Billable ICD-10-CM code, FY2026.

Applies from N13 Obstructive and reflux uropathy

Excludes2 (not included here)

• 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)

Applies from N13.7 Vesicoureteral-reflux

Excludes1 (never code together)

• reflux-associated pyelonephritis (N11.0)

MS-DRG index

Defines the logic of DRG(s) 698-700 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 593.71 Vesicoureteral reflux with reflux nephropathy, unilateral (approximate)

Code annotations containing back-references to N13.731

Back-references to N13.73

• Type 1 Excludes: N13.4 Hydroureter ("vesicoureteral-reflux with hydroureter (N13.73-)")

Back-references to N13

• Type 1 Excludes: N11.1 Chronic obstructive pyelonephritis ("obstructive uropathy (N13.-)")
• Code Also: N80.A4 Superficial endometriosis of ureter (", if applicable, obstructive and reflux uropathy (N13.-)")
• Code Also: N80.A5 Deep endometriosis of ureter (", if applicable, obstructive and reflux uropathy (N13.-)")
• Code Also: N80.A6 Endometriosis of ureter, unspecified depth (", if applicable, obstructive and reflux uropathy (N13.-)")

Diagnosis Index entries for N13.731

• Reflux › vesicoureteral (with scarring) › with › nephropathy › with hydroureter › unilateral

Nearby codes

• N13.72 Vesicoureteral-reflux with reflux nephropathy without 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
• N13.73 Vesicoureteral-reflux with reflux nephropathy with hydroureter
• N13.731 Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral (this code)
• N13.732 Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral
• N13.739 Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified
• N13.8 Other obstructive and reflux uropathy
• N13.9 Obstructive and reflux uropathy, unspecified