F05 — Delirium due to known physiological condition
Part of Chapter 5: Mental, Behavioral and Neurodevelopmental disorders , block Mental disorders due to known physiological conditions (F01-F09) .
Official Notes
Inclusion Terms
Acute or subacute brain syndrome
Inclusion Terms
Acute or subacute confusional state (nonalcoholic)
Inclusion Terms
Acute or subacute infective psychosis
Inclusion Terms
Acute or subacute organic reaction
Inclusion Terms
Acute or subacute psycho-organic syndrome
Inclusion Terms
Delirium of mixed etiology
Inclusion Terms
Delirium superimposed on dementia
Inclusion Terms
Sundowning
Code First
the underlying physiological condition, such as:
Code First
dementia ( F03.9- )
Excludes1
delirium NOS ( R41.0 )
Child Codes
F05 has no child codes in the FY 2027 release -- it is used on its own.
Referenced By
Official notes on these codes cite F05.
FY 2027 effective October 1, 2026 · CDC NCHS and CMS