Dementia due to Alzheimer disease

Definition

Dementia due to Alzheimer disease is the most common form of dementia. Onset is insidious with memory impairment typically reported as the initial presenting complaint. The characteristic course is a slow but steady decline from a previous level of cognitive functioning with impairment in additional cognitive domains (such as executive functions, attention, language, social cognition and judgment, psychomotor speed, visuoperceptual or visuospatial abilities) emerging with disease progression. Dementia due to Alzheimer disease may be accompanied by mental and behavioural symptoms such as depressed mood and apathy in the initial stages of the disease and may be accompanied by psychotic symptoms, irritability, aggression, confusion, abnormalities of gait and mobility, and seizures at later stages. Positive genetic testing, family history and gradual cognitive decline are suggestive of Dementia due to Alzheimer disease.

Coding note

This category should never be used in primary tabulation. The codes are provided for use as supplementary or additional codes when it is desired to identify the presence of dementia in diseases classified elsewhere.

5 subordinate codes

• 6D80.0Dementia due to Alzheimer disease with early onset
• 6D80.1Dementia due to Alzheimer disease with late onset
• 6D80.2Alzheimer disease dementia, mixed type, with cerebrovascular disease
• 6D80.3Alzheimer disease dementia, mixed type, with other nonvascular aetiologies
• 4B4ZDiseases of the immune system, unspecified

Nearby in Dementia

• 6D81Dementia due to cerebrovascular disease
• 6D82Dementia due to Lewy body disease
• 6D83Frontotemporal dementia
• 6D84Dementia due to psychoactive substances including medications
• 6D85Dementia due to diseases classified elsewhere
• 6D86Behavioural or psychological disturbances in dementia
• 4B4YOther specified diseases of the immune system
• 4B4ZDiseases of the immune system, unspecified