2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N36.42 is a billable ICD-10-CM diagnosis code for intrinsic sphincter deficiency (ISD). It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N36.42: its own notes plus those printed at N36.4, block N30-N39, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block N30-N39 Other diseases of the urinary system applies to 85 codes
  • urinary infection (complicating):
  • abortion or ectopic or molar pregnancy (O00-O07, O08.8)
  • pregnancy, childbirth and the puerperium (O23.-, O75.3, O86.2-)
From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From N36.4 Urethral functional and muscular disorders applies to 4 codes
  • code to identify associated urinary stress incontinence (N39.3)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N36.42Overview

What is the ICD-10 code for intrinsic sphincter deficiency (ISD)?

The ICD-10-CM code for intrinsic sphincter deficiency (ISD) is N36.42 (sometimes written as N3642). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 699, 698, 700, with relative weights from 0.6740 to 1.6400 depending on complications. Higher weights mean higher Medicare reimbursement.

Does N36.42 need an additional code?

When the condition applies, yes. The Use Additional Code note at N36.4, which applies to N36.42, reads: code to identify associated urinary stress incontinence (N39.3). The additional code is reported after N36.42.

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.