2026 ICD-10-CM Diagnosis Code G32.89Other specified degenerative disorders of nervous system in diseases classified elsewhere

ICD-10-CM Codes›G00–G99›G30-G32›G32

ICD-10-CM G32.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G32.89 is a billable ICD-10-CM diagnosis code for other specified degenerative disorders of nervous system in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (often hereditary or degenerative).

Code Identity

ICD-10-CM Code
G32.89
Billable Status
Yes — Valid for Submission
Code Describes
Other specified degenerative disorders of nervous system in diseases classified elsewhere
Short Description
Oth degeneratv disord of nervous sys in dis classd elswhr
Parent Code
G32.8
Other specified degenerative disorders of nervous system in diseases classified elsewhere

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG30-G32Other degenerative diseases of the nervous system
CategoryG32Other degenerative disorders of nervous system in diseases classified elsewhere
This CodeG32.89Other specified degenerative disorders of nervous system in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G32.89.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebral degeneration associated with another disorder
  • Cerebral degeneration associated with generalized lipidosis
  • Cerebral degeneration due to cerebrovascular disease
  • Cerebral degeneration due to hypothyroidism
  • Cerebral degeneration due to neoplastic disease
  • Cerebral degeneration due to progressive multifocal leukoencephalopathy
  • Cerebral degeneration due to vitamin B12 deficiency
  • Cerebral degeneration in Niemann-Pick disease
  • Encephalopathy due to folate deficiency
  • Encephalopathy due to multiple nutrient deficiencies
  • Encephalopathy due to nutritional deficiency
  • Encephalopathy due to vitamin B12 deficiency
  • Encephalopathy due to vitamin deficiency
  • Infantile inflammatory bowel disease with neurological involvement

Tabular List NotesGuidance

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

Inclusion Terms

  • Degenerative encephalopathy in diseases classified elsewhere

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.

    • Encephalopathy(acute)
      • degenerative, in specified disease NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS006
Other nervous system disorders (often hereditary or degenerative)
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Degenerative Nerve Diseases

Degenerative nerve diseases affect many of your body's activities, such as balance, movement, talking, breathing, and heart function. Many of these diseases are genetic. Sometimes the cause is a medical condition such as alcoholism, a tumor, or a stroke. Other causes may include toxins, chemicals, and viruses.

Read the full article at MedlinePlus

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

Convert G32.89 to ICD-9-CMHistory

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

ICD-9-CM
349.89 Cns disorder NEC
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 G32.89Overview

Is G32.89 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified degenerative disorders of nervous system in diseases classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can G32.89 be a principal diagnosis?

No. This is a manifestation code: other specified degenerative disorders of nervous system in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of G32.89?

Under the General Equivalence Mappings, other specified degenerative disorders of nervous system in diseases classified elsewhere converts to ICD-9-CM 349.89 (cns disorder NEC). 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.