2027 ICD-10-CM Diagnosis Code N32.81Overactive bladder

ICD-10-CM Codes›N00–N99›N30-N39›N32

ICD-10-CM N32.81
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N32.81 is a billable ICD-10-CM diagnosis code for overactive bladder. 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 autonomic hyperreflexia of urinary bladder. 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
N32.81
Billable Status
Yes — Valid for Submission
Code Describes
Overactive bladder
Short Description
Overactive bladder
Same as the full description in the CMS dataset.
Parent Code
N32.8
Other specified disorders of bladder

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN30-N39Other diseases of the urinary system
CategoryN32Other disorders of bladder
This CodeN32.81Overactive bladder

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autonomic hyperreflexia of urinary bladder
  • Detrusor overactivity
  • Finding of urinary bladder compliance
  • Idiopathic detrusor overactivity
  • Low compliance urinary bladder
  • Neurogenic detrusor overactivity
  • Overactive urinary bladder
  • Overactive urinary bladder due to prolapse of female genital organ

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N32.81: its own notes plus those printed at N32, 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.

  • Detrusor muscle hyperactivity

Excludes1

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

  • frequent urination due to specified bladder condition- code to condition

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 N32 Other disorders of bladder applies to 7 codes
  • calculus of bladder (N21.0)
  • cystocele (N81.1-)
  • hernia or prolapse of bladder, female (N81.1-)
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)

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N32.81, its category, or a range that includes it.

Code Also 2

These codes say N32.81 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • N39.3 Stress incontinence (female) (male)
    any associated overactive bladder (N32.81)
  • N39.4 Other specified urinary incontinence
    any associated overactive bladder (N32.81)

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

Clinical InformationClinical

  • Urinary Bladder, Overactive

    symptom of overactive detrusor muscle of the urinary bladder that contracts with abnormally high frequency and urgency. overactive bladder is characterized by the frequent feeling of needing to urinate during the day, during the night, or both. urinary incontinence may or may not be present.

Patient EducationClinical

Overactive Bladder

Overactive bladder is a condition in which the bladder squeezes urine out at the wrong time. You may have overactive bladder if you have two or more of these symptoms:

Read the full article at MedlinePlus

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

Convert N32.81 to ICD-9-CMHistory

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

ICD-9-CM
596.51 Hypertonicity of bladder
Exact Match The mapping is direct, with no qualifiers.

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 N32.81Overview

What is the ICD-10 code for overactive bladder?

The ICD-10-CM code for overactive bladder is N32.81 (sometimes written as N3281). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N32.81 (Other specified disorders of bladder) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report overactive bladder on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N32.81 group to?

When overactive bladder 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.

What is the ICD-9 equivalent of N32.81?

Under the General Equivalence Mappings, overactive bladder converts to ICD-9-CM 596.51 (hypertonicity of bladder). The mapping is a direct match.