Chapter VI
Diseases of the nervous system
(G00-G99)

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

G30 Alzheimer's disease
Includes: senile and presenile forms
Excludes: senile:
· degeneration of brain NEC ( G31.1 )
· dementia NOS ( F03 )
senility NOS ( R54 )
G30.0 Alzheimer's disease with early onset
Note: Onset usually before the age of 65
G30.1 Alzheimer's disease with late onset
Note: Onset usually after the age of 65
G30.8 Other Alzheimer's disease
G30.9 Alzheimer's disease, unspecified

G31 Other degenerative diseases of nervous system, not elsewhere classified
Excludes: Reye's syndrome ( G93.7 )
G31.0 Circumscribed brain atrophy
Pick's disease
Progressive isolated aphasia
G31.1 Senile degeneration of brain, not elsewhere classified
Excludes: Alzheimer's disease ( G30.- )
senility NOS ( R54 )
G31.2 Degeneration of nervous system due to alcohol
Alcoholic:
· cerebellar:
  · ataxia
  · degeneration
· cerebral degeneration
· encephalopathy
Dysfunction of autonomic nervous system due to alcohol
G31.8 Other specified degenerative diseases of nervous system
Grey-matter degeneration [Alpers]
Lewy body(ies)(dementia)(disease)
Subacute necrotizing encephalopathy [Leigh]
G31.9 Degenerative disease of nervous system, unspecified

G32* Other degenerative disorders of nervous system in diseases classified elsewhere
G32.0* Subacute combined degeneration of spinal cord in diseases classified elsewhere
Excludes: Subacute combined degeneration of spinal cord in vitamin B 12 deficiency ( E53.8+ )
G32.8* Other specified degenerative disorders of nervous system in diseases classified elsewhere