2026 ICD-10-CM Diagnosis Code N36.0Urethral fistula

ICD-10-CM Codes›N00–N99›N30-N39›N36

ICD-10-CM N36.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N36.0 is a billable ICD-10-CM diagnosis code for urethral fistula. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified diseases of bladder and urethra.

Code Identity

ICD-10-CM Code
N36.0
Billable Status
Yes — Valid for Submission
Code Describes
Urethral fistula
Short Description
Urethral fistula
Same as the full description in the CMS dataset.
Parent Code
N36
Other disorders of urethra

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN30-N39Other diseases of the urinary system
CategoryN36Other disorders of urethra
This CodeN36.0Urethral fistula

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired urethral fistula
  • Acquired urethrocutaneous fistula
  • Intestinourinary fistula
  • Multiple urethrocutaneous fistulae
  • Perineal fistula
  • Rectourinary fistula
  • Schistosomal urethral fistula
  • Schistosomiasis of urethra
  • Urethral fistula
  • Urethral fistula to skin
  • Urethroperineal fistula
  • Urethrorectal fistula
  • Urinary fistula
  • Urinary schistosomiasis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Urethroperineal fistula
  • Urethrorectal fistula
  • Urinary fistula NOS

Type 1 Excludes

  • urethroscrotal fistula N50.89
  • urethrovaginal fistula N82.1
  • urethrovesicovaginal fistula N82.1

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Fistula(cutaneous)
      • perineum, perineal (with urethral involvement) NEC
    • Fistula(cutaneous)
      • rectourethral
    • Fistula(cutaneous)
      • urethra
    • Fistula(cutaneous)
      • urethroperineal
    • Fistula(cutaneous)
      • urethrorectal
    • Fistula(cutaneous)
      • urinary (tract) (persistent) (recurrent)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN007
Other specified and unspecified diseases of bladder and urethra
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Urinary Fistula

    an abnormal passage in any part of the urinary tract between itself or with other organs.

  • Urinary Tract

    the duct which coveys urine from the pelvis of the kidney through the ureters, bladder, and urethra.

  • Urethral Fistula

    an abnormal communication between the urethra and another organ or anatomic site.

Patient EducationClinical

Fistulas

A fistula is an abnormal connection between two parts inside of the body. Fistulas may develop between different organs, such as between the esophagus and the windpipe or the bowel and the vagina. They can also develop between two blood vessels, such as between an artery and a vein or between two arteries.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N36.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
599.1 Urethral fistula
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N36.0Overview

Is N36.0 (Other disorders of urethra) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report urethral fistula on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N36.0 group to?

When urethral fistula is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N36.0?

Under the General Equivalence Mappings, urethral fistula converts to ICD-9-CM 599.1 (urethral fistula). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.