F05

✓ Billable

Delirium due to known physiological condition

Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

Also Known As

Acute or subacute brain syndromeAcute or subacute confusional state (nonalcoholic)Acute or subacute infective psychosisAcute or subacute organic reactionAcute or subacute psycho-organic syndromeDelirium of mixed etiologyDelirium superimposed on dementiaSundowning

📋 Code Instructions

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

❌ Excludes1

direct

Cannot be coded with F05

• delirium NOS (R41.0)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

• delirium tremens alcohol-induced or unspecified (F10.231, F10.921)

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Code Information

CodeF05

BillableYes

CategoryMental, Behavioral and Neurodevelopmental disorders (F01-F99)

Excludes11 rule(s)

Excludes21 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)