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

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700, 791, 793. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N31.2: its own notes plus those printed at N31, block N30-N39, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

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

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From N31 Neuromuscular dysfunction of bladder, not elsewhere classified applies to 5 codes
  • cord bladder NOS (G95.89)
  • neurogenic bladder due to cauda equina syndrome (G83.4)
  • neuromuscular dysfunction due to spinal cord lesion (G95.89)

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 N31 Neuromuscular dysfunction of bladder, not elsewhere classified applies to 5 codes
  • code to identify any associated urinary incontinence (N39.3-N39.4-)

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N31.2, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming N31.2: they are not reported together with it, unless the two conditions are unrelated.

  • G95.8 Other specified diseases of spinal cord
    neuromuscular dysfunction of bladder without spinal cord lesion (N31.-) names N31.-, which includes this code
  • N33 Bladder disorders in diseases classified elsewhere
    cystitis in neurogenic bladder (N31.-) names N31.-, which includes this code

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

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

Questions About N31.2Overview

What is the ICD-10 code for flaccid neuropathic bladder, not elsewhere classified?

The ICD-10-CM code for flaccid neuropathic bladder, not elsewhere classified is N31.2 (sometimes written as N312). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 793, 791, 699, 698, 700, with relative weights from 0.6740 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Can N31.2 be reported with G95.89?

Not as a rule. The Excludes1 note at N31, which applies to N31.2, lists "cord bladder NOS (G95.89)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does N31.2 need an additional code?

When the condition applies, yes. The Use Additional Code note at N31, which applies to N31.2, reads: code to identify any associated urinary incontinence (N39.3-N39.4-). The additional code is reported after N31.2.