2026 ICD-10-CM Diagnosis Code N31.9Neuromuscular dysfunction of bladder, unspecified

ICD-10-CM Codes›N00–N99›N30-N39›N31

ICD-10-CM N31.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N31.9 is a billable ICD-10-CM diagnosis code for neuromuscular dysfunction of bladder, unspecified. 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
N31.9
Billable Status
Yes — Valid for Submission
Code Describes
Neuromuscular dysfunction of bladder, unspecified
Short Description
Neuromuscular dysfunction of bladder, unspecified
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 CodeN31.9Neuromuscular dysfunction of bladder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal compliance of urinary bladder
  • Acquired obstructive nephropathy due to neurogenic bladder
  • Cauda equina syndrome with neurogenic urinary bladder
  • Functional disorder of neck of urinary bladder and sphincter mechanism
  • Functional disorder of urinary bladder
  • Functional disorder of urinary bladder due to prolapse of female genital organ
  • Late effects of poliomyelitis
  • Neurogenic dysfunction of urinary bladder
  • Neurogenic urinary bladder
  • Neurogenic urinary bladder due to and following cerebrovascular accident
  • Neurogenic urinary bladder due to quadriplegia
  • Neurogenic urinary bladder due to spina bifida
  • Neurogenic urinary bladder following poliomyelitis
  • Paraplegia with neurogenic urinary bladder

Tabular List NotesGuidance

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

Inclusion Terms

  • Neurogenic bladder dysfunction NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

  • - Neurogenic - See Also: condition;

    • - bladder - See Also: Dysfunction, bladder, neuromuscular; - N31.9

External Cause of Injuries IndexGuidance

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

    • Disorder(of)
      • bladder
        • functional NEC
    • Dysfunction
      • bladder
    • Dysfunction
      • bladder
        • neuromuscular NOS
    • Neurogenic
      • bladder
    • Neuropathy, neuropathic
      • 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

Clinical InformationClinical

  • Cauda Equina Syndrome with Neurogenic Bladder

    a rare neurologic disorder caused by impingement of the nerve roots of the cauda equina secondary to disc herniation, spinal stenosis, vertebral fracture, neoplasm or infection. clinical signs may include bladder or bowel dysfunction, paresthesia and weakness of the lower extremities. the development of neurogenic bladder implies that surgical decompression was either ineffective, delayed or not attempted.

  • Acquired Neurogenic Bladder

    neurogenic bladder, the cause of which is not present at birth.

  • Congenital Neurogenic Bladder

    neurogenic bladder, the cause of which is present at birth.

  • Grade 1 Urinary Retention, CTCAE|CTCAE Grade 1 Urinary retention (including neurogenic bladder)|Grade 1 Urinary retention|Grade 1 Urinary retention (including neurogenic bladder)

    urinary, suprapubic or intermittent catheter placement not indicated; able to void with some residual

  • Grade 2 Urinary Retention, CTCAE|CTCAE Grade 2 Urinary retention (including neurogenic bladder)|Grade 2 Urinary retention|Grade 2 Urinary retention (including neurogenic bladder)

    placement of urinary, suprapubic or intermittent catheter placement indicated; medication indicated

  • Grade 3 Urinary Retention, CTCAE|CTCAE Grade 3 Urinary retention (including neurogenic bladder)|Grade 3 Urinary retention|Grade 3 Urinary retention (including neurogenic bladder)

    elective invasive intervention indicated; substantial loss of affected kidney function or mass

  • Grade 4 Urinary Retention, CTCAE|CTCAE Grade 4 Urinary retention (including neurogenic bladder)|Grade 4 Urinary retention|Grade 4 Urinary retention (including neurogenic bladder)

    life-threatening consequences; organ failure; urgent operative intervention indicated

  • Grade 5 Urinary Retention, CTCAE|CTCAE Grade 5 Urinary retention (including neurogenic bladder)|Grade 5 Urinary retention|Grade 5 Urinary retention (including neurogenic bladder)

    death

  • Neurogenic Bladder

    malfunctioning urinary bladder due to central nervous system disorders or damage to the peripheral nerves that are involved in the control of urination. causes include spinal cord injuries, neural tube defects, brain tumors, strokes, and peripheral neuropathies (e.g., aids neuropathy and diabetic neuropathy).

  • Non-Neurogenic Neurogenic Bladder|Hinman Syndrome

    bladder sphincter dysfunction in an individual with normal bladder innervation, which may lead to renal impairment.

  • Urinary Retention, CTCAE|Urinary Retention|Urinary Retention (Priority 1)|Urinary retention|Urinary retention (including neurogenic bladder)

    a disorder characterized by accumulation of urine within the bladder because of the inability to urinate.

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 N31.9 to ICD-9-CMHistory

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

ICD-9-CM
596.54 Neurogenic bladder NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
596.59 Oth func dsdr bladder
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 N31.9Overview

Is N31.9 a billable code?

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

What MS-DRG does N31.9 group to?

When neuromuscular dysfunction of bladder, unspecified 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 N31.9?

Under the General Equivalence Mappings, neuromuscular dysfunction of bladder, unspecified converts to ICD-9-CM 596.54 (neurogenic bladder NOS) and 596.59 (oth func dsdr bladder). 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.