F05
✓ Billable
Delirium due to known physiological condition
ICD-10-CM · FY2026 · Mental, Behavioral and Neurodevelopmental Disorders
Code
F05
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Mental, Behavioral and Neurodevelopmental Disorders
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- 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 — never code together
- delirium NOS (R41.0)
Excludes2 — not included here, but may code together
- delirium tremens alcohol-induced or unspecified (F10.231, F10.921)
Code first
- the underlying physiological condition, such as:
- dementia (F03.9-)
Frequently asked questions
What is ICD-10 code F05?
ICD-10-CM code F05 represents Delirium due to known physiological condition. It is a billable diagnosis code in the Mental, Behavioral and Neurodevelopmental Disorders chapter, effective October 1, 2025 – September 30, 2026.
Is F05 billable?
Yes. F05 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is F05 in?
F05 belongs to the Mental, Behavioral and Neurodevelopmental Disorders chapter (F01–F99) of ICD-10-CM.
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