ICD-10-CM 2027 diagnosis code
N36.0Urethral fistula
N36.0 is a valid, billable ICD-10-CM code for urethral fistula. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Urethra fistula.
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 N36.0
N36.0 is the ICD-10-CM diagnosis code for urethral fistula. It belongs to category N36 (other disorders of urethra), block N30-N39 (other diseases of the urinary system) 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 N36 (other disorders of urethra), N36.0 is specifically for urethral fistula. Related codes cover urethral diverticulum (N36.1), urethral caruncle (N36.2), urethral functional and muscular disorders (N36.4), urethral false passage (N36.5), other specified disorders of urethra (N36.8) and urethral disorder, unspecified (N36.9).
Don't report N36.0 together with the conditions in its Excludes1 note: urethroscrotal fistula (N50.89), urethrovaginal fistula (N82.1) and urethrovesicovaginal fistula (N82.1).
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 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), 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 599.1 (urethral fistula).
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to N36.0.
Broader instructions also apply from N30-N39 Other diseases of the urinary system and Chapter 14: Diseases of the genitourinary system.
Alphabetic index entries
6 entriesTerms in the official ICD-10-CM index that lead to N36.0.
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
ICD-9-CM equivalent
Converter →- 599.1Urethral fistulaexact
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 N36.0
Is N36.0 billable?
- Yes. N36.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N36.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N36.0 as a principal diagnosis.
Is N36.0 a CC or MCC?
- N36.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does N36.0 group to?
- N36.0 is used in the MS-DRG v44.0 logic for MS-DRG 698 (Other Kidney and Urinary Tract Diagnoses with MCC), MS-DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC) and MS-DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC). 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 N36.0?
- The CMS General Equivalence Mappings map N36.0 to ICD-9-CM 599.1.