2026 ICD-10-CM Diagnosis Code N36.42Intrinsic sphincter deficiency (ISD)

ICD-10-CM Codes›N00–N99›N30-N39›N36

ICD-10-CM N36.42
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N36.42 is a billable ICD-10-CM diagnosis code for intrinsic sphincter deficiency (ISD). 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. Coders also document this condition as incompetent urethral closure mechanism. 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
N36.42
Billable Status
Yes — Valid for Submission
Code Describes
Intrinsic sphincter deficiency (ISD)
Short Description
Intrinsic sphincter deficiency (ISD)
Same as the full description in the CMS dataset.
Parent Code
N36.4
Urethral functional and muscular disorders

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN30-N39Other diseases of the urinary system
CategoryN36Other disorders of urethra
This CodeN36.42Intrinsic sphincter deficiency (ISD)

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Incompetent urethral closure mechanism
  • Urethral closure mechanism - finding
  • Urethral intrinsic sphincter deficiency
  • Urethral sphincter function - finding

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.

    • Deficiency, deficient
      • intrinsic
        • sphincter
    • Deficiency, deficient
      • sphincter, intrinsic

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

Patient EducationClinical

Urethral Disorders

The urethra is the tube that allows urine to pass out of the body. In men, it's a long tube that runs through the penis. It also carries semen in men. In women, it's short and is just above the vagina. Urethral problems may happen due to aging, illness, or injury. They include:

Read the full article at MedlinePlus

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

Convert N36.42 to ICD-9-CMHistory

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

ICD-9-CM
599.82 Intrinsc sphnctr dficncy
Approximate The match is approximate rather than exact.

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 N36.42Overview

Is N36.42 (Urethral functional and muscular disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report intrinsic sphincter deficiency (ISD) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N36.42 group to?

When intrinsic sphincter deficiency (ISD) 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 N36.42?

Under the General Equivalence Mappings, intrinsic sphincter deficiency (ISD) converts to ICD-9-CM 599.82 (intrinsc sphnctr dficncy). The mapping is approximate, so confirm the match fits the documentation.

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.