ICD10
ICD-10 Code G31.8: Other specified degenerative diseases of nervous system
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).
When is it used?
- May be used when a clinician documents other specified degenerative diseases of nervous system in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
chapter
6Diseases of the nervous system (G00-G99)
block
G30-G32Other degenerative diseases of the nervous system
category
G31Other degenerative diseases of nervous system, not elsewhere classified
currentG31
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
NeurologistGeneral Physician
Related codes
G31.80Leukodystrophy, unspecifiedcodeG31.81Alpers diseasecodeG31.82Leigh's diseasecodeG31.83Neurocognitive disorder with Lewy bodiescodeG31.84Mild cognitive impairment of uncertain or unknown etiologycodeG31.85Corticobasal degenerationcodeG31.86Alexander diseasecodeG31.87Primary progressive apraxia of speechcodeG31.89Other specified degenerative diseases of nervous systemcode
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 800703961000119100high
Acquired cerebellar atrophy
Source: SNOMED International ICD-10 map
SNOMED_CT 24059009high
Acute cerebellar ataxia caused by varicella
Source: SNOMED International ICD-10 map
SNOMED_CT 763310000high
Acute necrotising encephalopathy of childhood
Source: SNOMED International ICD-10 map
SNOMED_CT 230312006high
Aicardi Goutieres syndrome
Source: SNOMED International ICD-10 map
SNOMED_CT 1187045009high
Aicardi Goutieres syndrome type 1
Source: SNOMED International ICD-10 map
SNOMED_CT 1187046005high
Aicardi Goutieres syndrome type 2
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
G31.8
Replacement codes
G31.80 — Leukodystrophy, unspecifiedG31.81 — Alpers diseaseG31.82 — Leigh's diseaseG31.83 — Neurocognitive disorder with Lewy bodiesG31.84 — Mild cognitive impairment of uncertain or unknown etiologyG31.85 — Corticobasal degenerationG31.86 — Alexander diseaseG31.87 — Primary progressive apraxia of speechG31.89 — Other specified degenerative diseases of nervous system
Common synonyms
Other specified degenerative diseases of nervous system
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.