U.S. ICD-10-CM reference · FY2026 · April
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F05Billable / specificArchived

Delirium due to known physiological condition

Reference checks do not establish clinical appropriateness or guarantee reimbursement.

HierarchyF01-F09 · F05

Code-level instructions

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

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-)

Inherited instructions

Chapters 5 · Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

Includes

disorders of psychological development

Excludes 2

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

F01-F09 · Mental disorders due to known physiological conditions (F01-F09)

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.

Code edition