F05 is a billable/specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Delirium due to known physiological condition.
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Acute or subacute brain syndrome
Acute or subacute confusional state (nonalcoholic)
Acute or subacute infective psychosis
Acute or subacute organic reaction
Acute or subacute psycho-organic syndrome
Delirium of mixed etiology
Delirium superimposed on dementia
Sundowning
The underlying physiological condition, such as:
Dementia (F03.9-)
Delirium NOS (R41.0)
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