F05

Delirium due to known physiological condition

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · F05

Excludes 1

delirium NOS (R41.0)

Excludes 2

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

Code first

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

Synonyms

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

Inherited from F01-F09Mental disorders due to known physiological conditions

Note

This block comprises a range of mental disorders grouped together on the basis of their having in common a demonstrable etiology in cerebral disease, brain injury, or other insult leading to cerebral dysfunction. The dysfunction may be primary, as in diseases, injuries, and insults that affect the brain directly and selectively; or secondary, as in systemic diseases and disorders that attack the brain only as one of the multiple organs or systems of the body that are involved.

Inherited from chapter 5Mental, Behavioral and Neurodevelopmental disorders

Includes

disorders of psychological development

Excludes 2

symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Official Guidelines for F05

FY 2026 ›

I.C.5Chapter-specific guidanceChapter 5: Mental, Behavioral and Neurodevelopmental disorders

Subsections

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