G31: Other degenerative diseases of nervous system, not elsewhere classified
Codes under G31 (Other degenerative diseases of nervous system, not elsewhere classified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| G31.0 | Frontotemporal dementia | — |
| G31.0 | Frontotemporal dementia | — |
| G31.01 | Pick's disease | ✓ |
| G31.01 | Pick's disease | ✓ |
| G31.1 | Senile degeneration of brain, not elsewhere classified | ✓ |
| G31.1 | Senile degeneration of brain, not elsewhere classified | ✓ |
| G31.2 | Degeneration of nervous system due to alcohol | ✓ |
| G31.2 | Degeneration of nervous system due to alcohol | ✓ |
| G31.8 | Other specified degenerative diseases of nervous system | — |
| G31.8 | Other specified degenerative diseases of nervous system | — |
| G31.09 | Other frontotemporal neurocognitive disorder | ✓ |
| G31.09 | Other frontotemporal neurocognitive disorder | ✓ |
| G31.9 | Degenerative disease of nervous system, unspecified | ✓ |
| G31.9 | Degenerative disease of nervous system, unspecified | ✓ |
| G31.80 | Leukodystrophy, unspecified | ✓ |
| G31.80 | Leukodystrophy, unspecified | ✓ |
| G31.81 | Alpers disease | ✓ |
| G31.81 | Alpers disease | ✓ |
| G31.82 | Leigh's disease | ✓ |
| G31.82 | Leigh's disease | ✓ |
| G31.83 | Neurocognitive disorder with Lewy bodies | ✓ |
| G31.83 | Neurocognitive disorder with Lewy bodies | ✓ |
| G31.84 | Mild cognitive impairment of uncertain or unknown etiology | ✓ |
| G31.84 | Mild cognitive impairment of uncertain or unknown etiology | ✓ |
| G31.85 | Corticobasal degeneration | ✓ |
| G31.85 | Corticobasal degeneration | ✓ |
| G31.86 | Alexander disease | ✓ |
| G31.86 | Alexander disease | ✓ |
| G31.87 | Primary progressive apraxia of speech | ✓ |
| G31.87 | Primary progressive apraxia of speech | ✓ |
| G31.89 | Other specified degenerative diseases of nervous system | ✓ |
| G31.89 | Other specified degenerative diseases of nervous system | ✓ |
Frequently asked questions
What is ICD-10-CM code G31?
G31 is an ICD-10-CM category covering Other degenerative diseases of nervous system, not elsewhere classified. It contains 32 more specific diagnosis codes, 28 of which are billable.
Is G31 a billable code?
No — G31 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G31.0 — Frontotemporal dementia). 28 of the 32 codes under G31 are billable.
What codes fall under G31?
G31 includes G31.0, G31.0, G31.01, G31.01, G31.1, plus 27 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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