ICD-10-CM 2027 diagnosis code
N13Obstructive and reflux uropathy
N13 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About N13
N13 is the ICD-10-CM diagnosis code for obstructive and reflux uropathy. It belongs to block N10-N16 (renal tubulo-interstitial diseases) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: N13.0 (obstruction), N13.1 (classified), N13.2 (obstruction), N13.3 (hydronephrosis), N13.4 (hydroureter), N13.5 (hydronephrosis), N13.6 (Pyonephrosis), N13.7 (Vesicoureteral-reflux) and 2 more.
The conditions in its Excludes2 note aren't part of N13, but may be coded alongside it if the patient has both: 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) and obstructive pyelonephritis (N11.1).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under N13
- N13.0Hydronephrosis with ureteropelvic junction obstructionBillable
- N13.1Hydronephrosis with ureteral stricture, not elsewhere classifiedBillable
- N13.2Hydronephrosis with renal and ureteral calculous obstructionBillable
- N13.3Other and unspecified hydronephrosis
- N13.4HydroureterBillable
- N13.5Crossing vessel and stricture of ureter without hydronephrosisBillable
- N13.6PyonephrosisBillable
- N13.7Vesicoureteral-reflux
- N13.8Other obstructive and reflux uropathyBillable
- N13.9Obstructive and reflux uropathy, unspecifiedBillable
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to N13.
Broader instructions also apply from N10-N16 Renal tubulo-interstitial diseases and Chapter 14: Diseases of the genitourinary system.
Codes whose notes reference N13
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about N13
Is N13 billable?
- No. N13 is a header code. Report one of its more specific subcodes instead.