N13 – Obstructive and reflux uropathy

ICD-10-CM 2027 diagnosis code · Renal tubulo-interstitial diseases

Non-billable header

ICD-10-CM code N13

Code: N13 (claims format: N13)
Description: Obstructive and reflux uropathy
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 14. Diseases of the genitourinary system (N00-N99)
Block: N10-N16 Renal tubulo-interstitial diseases

Billable codes under N13

N13 is a header code and cannot be used on claims. Choose the most specific code:

N13.0 – Hydronephrosis with ureteropelvic junction obstructionBillable
N13.1 – Hydronephrosis with ureteral stricture, not elsewhere classifiedBillable
N13.2 – Hydronephrosis with renal and ureteral calculous obstructionBillable
N13.3 – Other and unspecified hydronephrosisHeader (more codes below)
N13.4 – HydroureterBillable
N13.5 – Crossing vessel and stricture of ureter without hydronephrosisBillable
N13.6 – PyonephrosisBillable
N13.7 – Vesicoureteral-refluxHeader (more codes below)
N13.8 – Other obstructive and reflux uropathyBillable
N13.9 – Obstructive and reflux uropathy, unspecifiedBillable

Notes for N13

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)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block N10-N16

Includes:

pyelonephritis

Excludes1 (not coded here):

pyeloureteritis cystica (N28.85)

Frequently asked questions

What is ICD-10 code N13?

N13 is the ICD-10-CM code for obstructive and reflux uropathy, in the block N10-N16 (Renal tubulo-interstitial diseases).

Is N13 a billable code?

No. N13 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.