G31.8 Other specified degenerative diseases of nervous system

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Other specified degenerative diseases of nervous system is G31.8 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
G30-G32: Other degenerative diseases of the nervous system (G30-G32)
Category G31
17 codes (14 billable)
FY2026 Status
Stable since FY2024

Official Coding Guidelines

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.a
Pain - Category G89 (TOC entry)

b. Pain - Category G89.............................................................................................................. 45

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

G31 Other degenerative diseases of nervous system, not elsewhere classified

More Specific Codes

G31.80 Leukodystrophy, unspecified G31.81 Alpers disease G31.82 Leigh's disease G31.83 Neurocognitive disorder with Lewy bodies G31.84 Mild cognitive impairment of uncertain or unknown etiology G31.85 Corticobasal degeneration G31.86 Alexander disease G31.87 Primary progressive apraxia of speech G31.89 Other specified degenerative diseases of nervous system

Related Codes in G31

G31 Other degenerative diseases of nervous system, not elsewhere classified G31.0 Frontotemporal dementia G31.01 Pick's disease G31.09 Other frontotemporal neurocognitive disorder G31.1 Senile degeneration of brain, not elsewhere classified G31.2 Degeneration of nervous system due to alcohol G31.80 Leukodystrophy, unspecified G31.81 Alpers disease G31.82 Leigh's disease G31.83 Neurocognitive disorder with Lewy bodies G31.84 Mild cognitive impairment of uncertain or unknown etiology G31.85 Corticobasal degeneration G31.86 Alexander disease G31.87 Primary progressive apraxia of speech G31.89 Other specified degenerative diseases of nervous system G31.9 Degenerative disease of nervous system, unspecified
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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