How to Diagnose PiD According to DSM-V or ICD-10

]n ICD-10 [6 ] a fifth character may be used to specify psychotic symptoms in dementia in Alzheimer’s disease (F00), vascular dementia (F01), dementia in diseases classified elsewhere (F02) or unspecified dementia (F03). This may be x1 for other symptoms, predominantly delusional, and x2 for other symptoms, predominantly hallucinatory. Hence, a person with late-onset Alzheimer’s disease with prominent delusions may receive the diagnosis F00.11. In DSM-V the term dementia, which was used in DSM-IV, has been replaced by the term major neurocognitive disorder [7]. An extra character may be used to distinguish between “with or without behavioural disturbance”.

Diagnostic criteria for psychosis in Alzheimer’s disease have been suggested [8]. They require that hallucinations or delusions are present in a person who meets all the criteria of Alzheimer’s disease and that they have been present for at least 1 month and be of a severity that causes disruption in the patients’ or others’ functioning. The symptoms should not have been present prior to the onset of AD. The authors state that the criteria may also be valid for other types of dementia, provided that the criteria of dementia subtype, e.g. vascular dementia or Lewy body dementia, are adjusted accordingly.

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