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	—
G31.01	Pick's disease	✓
G31.1	Senile degeneration of brain, not elsewhere classified	✓
G31.2	Degeneration of nervous system due to alcohol	✓
G31.8	Other specified degenerative diseases of nervous system	—
G31.09	Other frontotemporal neurocognitive disorder	✓
G31.9	Degenerative disease of nervous system, unspecified	✓
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	✓

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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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