6D85

ICD-11 MMS 2026-01

Dementia due to diseases classified elsewhere

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. When dementia is due to multiple aetiologies, code all that apply.

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.

Index terms

  • Dementia due to diseases classified elsewhere

Exclusions from above levels

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

Child codes

  • 6D85.0 – Dementia due to Parkinson disease
  • 6D85.1 – Dementia due to Huntington disease
  • 6D85.2 – Dementia due to exposure to heavy metals or other toxins
  • 6D85.3 – Dementia due to human immunodeficiency virus
  • 6D85.4 – Dementia due to multiple sclerosis
  • 6D85.5 – Dementia due to prion disease
  • 6D85.6 – Dementia due to normal pressure hydrocephalus
  • 6D85.7 – Dementia due to injury to the head
  • 6D85.8 – Dementia due to pellagra
  • 6D85.9 – Dementia due to Down syndrome
  • 6D85.Y – Dementia due to other specified diseases classified elsewhere

Sibling codes

  • 6D80 – Dementia due to Alzheimer disease
  • 6D81 – Dementia due to cerebrovascular disease
  • 6D82 – Dementia due to Lewy body disease
  • 6D83 – Frontotemporal dementia
  • 6D84 – Dementia due to psychoactive substances including medications
  • 6D86 – Behavioural or psychological disturbances in dementia
  • 6D8Y – Dementia, other specified cause
  • 6D8Z – Dementia, unknown or unspecified cause

Foundation entity

Dementia due to diseases classified elsewhere – http://id.who.int/icd/entity/1468768235

Allowed postcoordination axes

Part of: 06: Mental, behavioural or neurodevelopmental disorders