Delirium due to known physiological condition

**Inclusion terms:** - 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

**Excludes1:** - delirium NOS (R41.0)

**Excludes2:** - delirium tremens alcohol-induced or unspecified (F10.231, F10.921)

**Code first:** - the underlying physiological condition, such as: - dementia (F03.9-)