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G31

Other degenerative diseases of nervous system, not elsewhere classified

• Reye's syndrome (G93.7)

G31.0

Frontotemporal dementia

G31.01

Pick's disease

• Primary progressive aphasia
• Progressive isolated aphasia

G31.09

Other frontotemporal dementia

• Frontal dementia

G31.1

Senile degeneration of brain, not elsewhere classified

• Alzheimer's disease (G30.-)
• senility NOS (R41.81)

G31.2

Degeneration of nervous system due to alcohol

• associated alcoholism (F10.-)

• Alcoholic cerebellar ataxia
• Alcoholic cerebellar degeneration
• Alcoholic cerebral degeneration
• Alcoholic encephalopathy
• Dysfunction of the autonomic nervous system due to alcohol

G31.8

Other specified degenerative diseases of nervous system

G31.81

Alpers disease

• Grey-matter degeneration

G31.82

Leigh's disease

• Subacute necrotizing encephalopathy

G31.83

Dementia with Lewy bodies

• Dementia with Parkinsonism
• Lewy body dementia
• Lewy body disease

G31.84

Mild cognitive impairment, so stated

• age related cognitive decline (R41.81)
• altered mental status (R41.82)
• cerebral degeneration (G31.9)
• change in mental status (R41.82)
• cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-, I69.11-, I69.21-, I69.31-, I69.81-, I69.91-)
• cognitive impairment due to intracranial or head injury (S06.-)
• dementia (F01.-, F02.-, F03)
• mild memory disturbance (F06.8)
• neurologic neglect syndrome (R41.4)
• personality change, nonpsychotic (F68.8)

• Mild neurocognitive disorder

G31.85

Corticobasal degeneration

G31.89

Other specified degenerative diseases of nervous system

G31.9

Degenerative disease of nervous system, unspecified