2026 ICD-10-CM Diagnosis Code N31.8Other neuromuscular dysfunction of bladder

ICD-10-CM Codes›N00–N99›N30-N39›N31

ICD-10-CM N31.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N31.8 is a billable ICD-10-CM diagnosis code for other neuromuscular dysfunction of bladder. 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
N31.8
Billable Status
Yes — Valid for Submission
Code Describes
Other neuromuscular dysfunction of bladder
Short Description
Other neuromuscular dysfunction of bladder
Same as the full description in the CMS dataset.
Parent Code
N31
Neuromuscular dysfunction of bladder, not elsewhere classified

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN30-N39Other diseases of the urinary system
CategoryN31Neuromuscular dysfunction of bladder, not elsewhere classified
This CodeN31.8Other neuromuscular dysfunction of bladder

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal compliance of urinary bladder
  • Abnormal sensation of urinary bladder
  • Absent sensation of urinary bladder
  • Absent sensation of urinary bladder due to prolapse of pelvic organ
  • Congenital neurogenic urinary bladder
  • Decentralized urinary bladder
  • Detrusor areflexia
  • Finding of measure of urinary bladder
  • Hypersensitivity of urinary bladder
  • Hyposensitivity of urinary bladder
  • Noncompliant neuropathic urinary bladder
  • Noncompliant urinary bladder
  • Nonneurogenic neurogenic urinary bladder dysfunction
  • Reduced urinary bladder sensation due to prolapse of pelvic organ
  • Spastic neurogenic urinary bladder
  • Urinary bladder muscle dysfunction - underactive

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.

    • Atrophy, atrophic(of)
      • bladder
        • neurogenic
    • Dysfunction
      • bladder
        • neuromuscular NOS
          • specified NEC
    • Hypertony, hypertonia, hypertonicity
      • bladder

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

Bladder Diseases

The bladder is a hollow organ in your lower abdomen that stores urine. Many conditions can affect your bladder. Some common ones are:

Read the full article at MedlinePlus

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

Convert N31.8 to ICD-9-CMHistory

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

ICD-9-CM
596.52 Low bladder compliance
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 N31.8Overview

Is N31.8 a billable code?

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

What MS-DRG does N31.8 group to?

When other neuromuscular dysfunction of bladder 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 N31.8?

Under the General Equivalence Mappings, other neuromuscular dysfunction of bladder converts to ICD-9-CM 596.52 (low bladder compliance). 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.