6D80.Z

ICD-11 MMS 2026-01

Dementia due to Alzheimer disease, onset unknown or unspecified

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.

Coding note from above levels

This category should only be used for primary tabulation, if the aetiology of the dementia is unknown. If the aetiology of the dementia is known code to the aetiology of the dementia for primary tabulation. When dementia is due to multiple aetiologies, code all that apply.

Exclusions from above levels

  • 6A00 – Disorders of intellectual development
  • 6D70 – Delirium
  • http://id.who.int/icd/entity/1516623224 – Neurodevelopmental disorders
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  • MB20.0 – Stupor
  • MB20.1 – Coma
  • MG2A – Ageing associated decline in intrinsic capacity
  • QE62 – Uncomplicated bereavement
  • QE84 – Acute stress reaction

Sibling codes

  • 6D80.0 – Dementia due to Alzheimer disease with early onset
  • 6D80.1 – Dementia due to Alzheimer disease with late onset
  • 6D80.2 – Alzheimer disease dementia, mixed type, with cerebrovascular disease
  • 6D80.3 – Alzheimer disease dementia, mixed type, with other nonvascular aetiologies

Foundation entity

Dementia due to Alzheimer disease – http://id.who.int/icd/entity/795022044

Allowed postcoordination axes

Part of: 6D80: Dementia due to Alzheimer disease › 06: Mental, behavioural or neurodevelopmental disorders