ICD-10-CM · Chapter 6 · G00-G99
G31 Other degenerative diseases of nervous system, not elsewhere classified
Excludes 2 (not included here)
- Reye's syndrome (G93.7)
Use Additional Code
- code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
- mild neurocognitive disorder due to known physiological condition (F06.7-)
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| G31..0 | Frontotemporal dementia | No |
| G31..01 | Pick's disease | Yes |
| G31..09 | Other frontotemporal neurocognitive disorder | Yes |
| G31..1 | Senile degeneration of brain, not elsewhere classified | Yes |
| G31..2 | Degeneration of nervous system due to alcohol | Yes |
| G31..8 | Other specified degenerative diseases of nervous system | No |
| G31..80 | Leukodystrophy, unspecified | Yes |
| G31..81 | Alpers disease | Yes |
| G31..82 | Leigh's disease | Yes |
| G31..83 | Neurocognitive disorder with Lewy bodies | Yes |
| G31..84 | Mild cognitive impairment of uncertain or unknown etiology | Yes |
| G31..85 | Corticobasal degeneration | Yes |
| G31..86 | Alexander disease | Yes |
| G31..87 | Primary progressive apraxia of speech | Yes |
| G31..89 | Other specified degenerative diseases of nervous system | Yes |
| G31..9 | Degenerative disease of nervous system, unspecified | Yes |
Last reviewed: September 2026