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.
Inclusion term
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
Code first
The underlying physiological condition, such as:
Dementia (F03.9-)
Type 1 excludes
Delirium NOS (R41.0)
Type 2 excludes
Versions
2026
No changes
2025
No changes
2024
Code changed
Code first
the underlying physiological condition
- the underlying physiological condition, such as:
- dementia (F03.9-)
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code