F05

ICD-10Billable

Delirium due to known physiological condition

Official ICD-10-CM descriptor (FY2026)

Delirium due to known physiological condition

F05 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • 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

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • delirium NOS (R41.0)

Excludes2

Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.

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

Code first

Sequence the underlying condition before this code.

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

Where this code sits

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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