Skip to content
Dx

ICD-10-CM 2027 diagnosis code

N13.0Hydronephrosis with ureteropelvic junction obstruction

✓ Billable / specificCC — complication/comorbidity

N13.0 is a valid, billable ICD-10-CM code for hydronephrosis with ureteropelvic junction obstruction. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N13.0

N13.0 is the ICD-10-CM diagnosis code for hydronephrosis with ureteropelvic junction obstruction. It belongs to category N13 (obstructive and reflux uropathy), block N10-N16 (renal tubulo-interstitial diseases) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N13 (obstructive and reflux uropathy), N13.0 is specifically for hydronephrosis with ureteropelvic junction obstruction. Related codes cover hydronephrosis with ureteral stricture, not elsewhere classified (N13.1), hydronephrosis with renal and ureteral calculous obstruction (N13.2), other and unspecified hydronephrosis (N13.3), hydroureter (N13.4), Crossing vessel and stricture of ureter without hydronephrosis (N13.5), Pyonephrosis (N13.6), Vesicoureteral-reflux (N13.7), other obstructive and reflux uropathy (N13.8) and 1 more.

The conditions in its Excludes2 note aren't part of N13.0, but may be coded alongside it if the patient has both: Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 693 (Urinary Stones with MCC, relative weight 1.3168), DRG 694 (Urinary Stones without MCC, relative weight 0.7815), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 591 (hydronephrosis) and 593.3 (stricture or kinking of ureter).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Hydronephrosis due to acquired occlusion of ureteropelvic junction
Excludes2Not included here — may be reported together if both conditions exist
  • Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2)

Notes that apply from higher levels

Instructions written at a parent level also apply to N13.0.

› From N13 Obstructive and reflux uropathy
Excludes2
  • 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)

Broader instructions also apply from N10-N16 Renal tubulo-interstitial diseases and Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

5 entries

Terms in the official ICD-10-CM index that lead to N13.0.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 11 · Diseases and Disorders of the Kidney and Urinary Tract

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 591Hydronephrosisapproximate, combination
  • 593.3Stricture or kinking of ureterapproximate, combination

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2017 (effective 10/1/2016): Added
  • No changes since FY2017.

Common questions about N13.0

Is N13.0 billable?

Yes. N13.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N13.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N13.0 as a principal diagnosis.

Is N13.0 a CC or MCC?

N13.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does N13.0 group to?

N13.0 is used in the MS-DRG v44.0 logic for MS-DRG 693 (Urinary Stones with MCC), MS-DRG 694 (Urinary Stones without MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for N13.0?

The CMS General Equivalence Mappings map N13.0 to ICD-9-CM 591 and 593.3.