ICD-10-CM 2027 diagnosis code
N13.2Hydronephrosis with renal and ureteral calculous obstruction
N13.2 is a valid, billable ICD-10-CM code for hydronephrosis with renal and ureteral calculous obstruction. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 N13.2
N13.2 is the ICD-10-CM diagnosis code for hydronephrosis with renal and ureteral calculous 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), N13.2 is specifically for hydronephrosis with renal and ureteral calculous obstruction. Related codes cover hydronephrosis with ureteropelvic junction obstruction (N13.0), hydronephrosis with ureteral stricture, not elsewhere classified (N13.1), 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.
Don't report N13.2 together with the conditions in its Excludes1 note: Hydronephrosis with renal and ureteral calculous obstruction with infection (N13.6).
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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 591 (hydronephrosis), 592.0 (calculus of kidney) and 592.1 (calculus of ureter).
Coding notes
- Hydronephrosis with renal and ureteral calculous obstruction with infection (N13.6)
Notes that apply from higher levels
Instructions written at a parent level also apply to N13.2.
Broader instructions also apply from N10-N16 Renal tubulo-interstitial diseases and Chapter 14: Diseases of the genitourinary system.
Alphabetic index entries
8 entriesTerms in the official ICD-10-CM index that lead to N13.2.
- Calculus, calculi, calculous › kidney (impacted) (multiple) (pelvis) (recurrent) (staghorn) › with calculus, ureter › with hydronephrosis
- Calculus, calculi, calculous › kidney (impacted) (multiple) (pelvis) (recurrent) (staghorn) › congenital › with hydronephrosis
- Calculus, calculi, calculous › ureter (impacted) (recurrent) › with calculus, kidney › with hydronephrosis
- Calculus, calculi, calculous › ureter (impacted) (recurrent) › with hydronephrosis
- Calculus, calculi, calculous › urinary (duct) (impacted) (passage) (tract) › with hydronephrosis
- Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC › with › obstruction (by) (of) › renal calculus
- Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC › with › obstruction (by) (of) › ureteral NEC › calculus
- Ureteritis › due to calculus › with calculus, kidney › with hydronephrosis
Codes whose notes reference N13.2
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
- 592.0Calculus of kidneyapproximate, combination
- 592.1Calculus of ureterapproximate, combination
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
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 N13.2
Is N13.2 billable?
- Yes. N13.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N13.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N13.2 as a principal diagnosis.
Is N13.2 a CC or MCC?
- N13.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does N13.2 group to?
- N13.2 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 N13.2?
- The CMS General Equivalence Mappings map N13.2 to ICD-9-CM 591, 592.0 and 592.1.