ICD-10-CM · Chapter 5 · F01-F99
F05 Delirium due to known physiological condition
Includes
- 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
Excludes 1 (cannot be coded together)
- delirium NOS (R41.0)
Excludes 2 (not included here)
- delirium tremens alcohol-induced or unspecified (F10.231, F10.921)
Code First
- the underlying physiological condition, such as:
- dementia (F03.9-)
This category is a complete, billable diagnosis code.
No additional specificity is required — submit F05 directly on claims and documentation without a subcode extension.
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category F05:
- Delirium — Delirio
Last reviewed: September 2026