2026 ICD-10-CM Diagnosis Code N31.2Flaccid neuropathic bladder, not elsewhere classified

ICD-10-CM Codes›N00–N99›N30-N39›N31

ICD-10-CM N31.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N31.2 is a billable ICD-10-CM diagnosis code for flaccid neuropathic bladder, not elsewhere classified. 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 acontractile detrusor. 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
N31.2
Billable Status
Yes — Valid for Submission
Code Describes
Flaccid neuropathic bladder, not elsewhere classified
Short Description
Flaccid neuropathic bladder, not elsewhere classified
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 CodeN31.2Flaccid neuropathic bladder, not elsewhere classified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acontractile detrusor
  • Detrusor muscle paresis
  • Flaccid neurogenic urinary bladder
  • Hypotonic urinary bladder
  • Inertia of urinary bladder
  • Paralysis of sphincter of urinary bladder
  • Paralysis of urinary bladder
  • Urinary bladder muscle dysfunction - underactive

Tabular List NotesGuidance

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

Inclusion Terms

  • Atonic (motor) (sensory) neuropathic bladder
  • Autonomous neuropathic bladder
  • Nonreflex neuropathic bladder

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.

    • Atonia, atony, atonic
      • bladder (sphincter) (neurogenic)
    • Autonomic, autonomous
      • bladder (neurogenic)
    • Cystoplegia
    • Dysfunction
      • bladder
        • neuromuscular NOS
          • atonic (motor) (sensory)
    • Dysfunction
      • bladder
        • neuromuscular NOS
          • autonomous
    • Dysfunction
      • bladder
        • neuromuscular NOS
          • flaccid
    • Dysfunction
      • bladder
        • neuromuscular NOS
          • nonreflex
    • Hypotonia, hypotonicity, hypotony
      • bladder
    • Inertia
      • bladder (neurogenic)
    • Inertia
      • vesical (neurogenic)
    • Neuropathy, neuropathic
      • bladder
        • atonic (motor) (sensory)
    • Neuropathy, neuropathic
      • bladder
        • autonomous
    • Neuropathy, neuropathic
      • bladder
        • flaccid
    • Neuropathy, neuropathic
      • bladder
        • nonreflex
    • Paralysis, paralytic(complete) (incomplete)
      • bladder (neurogenic) (sphincter)
    • Paresis
      • vesical NEC
    • Relaxation
      • bladder (sphincter)
    • Relaxation
      • vesical

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 N31.2 to ICD-9-CMHistory

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

ICD-9-CM
596.4 Atony of bladder
Approximate The match is approximate rather than exact.
ICD-9-CM
596.53 Paralysis of 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 N31.2Overview

Is N31.2 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report flaccid neuropathic bladder, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N31.2 group to?

When flaccid neuropathic bladder, not elsewhere classified 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 N31.2?

Under the General Equivalence Mappings, flaccid neuropathic bladder, not elsewhere classified converts to ICD-9-CM 596.4 (atony of bladder) and 596.53 (paralysis of 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.