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 degenerative diseases of the nervous system (G30-G32) =

G30 Alzheimer's disease

 * Includes Alzheimer's dementia senile and presenile forms
 * Use additional code to identify:
 * delirium, if applicable (F05)
 * dementia with behavioral disturbance (F02.81)
 * dementia without behavioral disturbance (F02.80)
 * Excludes1: senile degeneration of brain NEC (G31.1)
 * senile dementia NOS (F03)
 * senility NOS (R41.81)
 * G30.0 Alzheimer's disease with early onset
 * G30.1 Alzheimer's disease with late onset
 * G30.8 Other Alzheimer's disease
 * G30.9 Alzheimer's disease, unspecified

G31 Other degenerative diseases of nervous system, not elsewhere classified

 * Use additional code to identify:
 * dementia with behavioral disturbance (F02.81)
 * dementia without behavioral disturbance (F02.80)
 * Excludes2: Reye's syndrome (G93.7)
 * G31.0 Frontotemporal dementia
 * G31.01 Pick's disease
 * Circumscribed brain atrophy
 * Progressive isolated aphasia
 * G31.09 Other frontotemporal dementia
 * Frontal dementia
 * G31.1 Senile degeneration of brain, not elsewhere classified
 * Excludes1: Alzheimer's disease (G30.-)
 * senility NOS (R41.81)
 * G31.2 Degeneration of nervous system due to alcohol
 * Alcoholic cerebellar ataxia
 * Alcoholic cerebellar degeneration
 * Alcoholic cerebral degeneration
 * Alcoholic encephalopathy
 * Dysfunction of the autonomic nervous system due to alcohol
 * Code also associated alcoholism (F10.-)
 * 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