2026 ICD-10-CM Diagnosis Code G31.2Degeneration of nervous system due to alcohol

ICD-10-CM Codes›G00–G99›G30-G32›G31

ICD-10-CM G31.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G31.2 is a billable ICD-10-CM diagnosis code for degeneration of nervous system due to alcohol. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Alcohol-related disorders and Other nervous system disorders (often hereditary or degenerative).

Code Identity

ICD-10-CM Code
G31.2
Billable Status
Yes — Valid for Submission
Code Describes
Degeneration of nervous system due to alcohol
Short Description
Degeneration of nervous system due to alcohol
Same as the full description in the CMS dataset.
Parent Code
G31
Other degenerative diseases of nervous system, not elsewhere classified

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG30-G32Other degenerative diseases of the nervous system
CategoryG31Other degenerative diseases of nervous system, not elsewhere classified
This CodeG31.2Degeneration of nervous system due to alcohol

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alcohol induced disorder co-occurrent and due to alcohol dependence
  • Alcoholic cerebellar degeneration
  • Alcoholic encephalopathy
  • Alcohol-induced cerebellar ataxia
  • Ataxia caused by ethanol
  • Cerebellar ataxia associated with another disorder
  • Cerebellar ataxia caused by chemical
  • Cerebellar ataxia due to alcoholism
  • Cerebral degeneration due to alcoholism
  • Degenerative brain disorder caused by alcohol
  • Morel laminar sclerosis
  • Secondary cerebellar degeneration
  • Substance-induced ataxia

Tabular List NotesGuidance

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

Inclusion Terms

  • Alcoholic cerebellar ataxia
  • Alcoholic cerebellar degeneration
  • Alcoholic cerebral degeneration
  • Alcoholic encephalopathy
  • Dysfunction of the autonomic nervous system due to alcohol

Code Also

  • associated alcoholism F10

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.

    • Ataxia, ataxy, ataxic
      • cerebellar (hereditary)
        • alcoholic
    • Ataxia, ataxy, ataxic
      • cerebellar (hereditary)
        • in
          • alcoholism
    • Degeneration, degenerative
      • brain (cortical) (progressive)
        • alcoholic
    • Degeneration, degenerative
      • brain (cortical) (progressive)
        • in
          • alcoholism
    • Degeneration, degenerative
      • cerebellar NOS
        • alcoholic
    • Degeneration, degenerative
      • cortical (cerebellar) (parenchymatous)
        • alcoholic
    • Degeneration, degenerative
      • nervous system
        • alcoholic
    • Dysfunction
      • autonomic
        • due to alcohol
    • Encephalopathy(acute)
      • alcoholic

Clinical ClassificationClinical

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

CCSR MBD017
Alcohol-related disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR NVS006
Other nervous system disorders (often hereditary or degenerative)
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Alcohol Use Disorder (AUD)

For most adults, moderate alcohol use is probably not harmful. Your risk of developing an alcohol use disorder (AUD) depends on how much, how often, and how quickly you drink alcohol. Alcohol misuse means that drinking causes distress and harm. Over time alcohol misuse can increase your risk of AUD.

The full article covers:

  • What is alcohol use disorder (AUD)?
  • What is binge drinking?
  • What are the dangers of too much alcohol?
  • How do I know if I have an alcohol use disorder (AUD)?
  • What should I do if I think that I might have an alcohol use disorder (AUD)?

Read the full article at MedlinePlus

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

Convert G31.2 to ICD-9-CMHistory

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

ICD-9-CM
331.7 Cereb degen in oth dis
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 G31.2Overview

Is G31.2 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report degeneration of nervous system due to alcohol on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G31.2?

Under the General Equivalence Mappings, degeneration of nervous system due to alcohol converts to ICD-9-CM 331.7 (cereb degen in oth dis). 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.