ICD-9-CM Code 294.8

Other persistent mental disorders due to conditions classified elsewhere
Amnestic disorder NOS
Epileptic psychosis NOS
Mixed paranoid and affective organic psychotic states
Use additional code for associated epilepsy (345.0-345.9)
Excludes: mild memory disturbances, not amounting to dementia (310.89)
Code first any underlying physical condition, as:

Alzheimer's disease (331.0)
cerebral lipidoses (330.1),
dementia with Lewy bodies (331.82)
dementia with Parkinsonism (331.82)
epilepsy (345.0-345.9)
frontal dementia (331.19)
frontotemporal dementia (331.19)
general paresis [syphilis] (094.1)
hepatolenticular degeneration (275.1)
Huntington's chorea (333.4)
Jakob-Creutzfeldt disease (046.1)
multiple sclerosis (340)
Parkinsonson's disease (332.0)
Pick's disease of the brain (331.11)
polyarteritis nodosa (446.0)
syphilis (094.1)