U.S. ICD-10-CM · FY 2027

F05 ICD-10-CM Code: Delirium due to known physiological condition

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

F05

Delirium due to known physiological condition

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where F05 sits

  1. 1

    Chapter 5

    Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

  2. 2

    Section

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

  3. 3

    Category F05

    Delirium due to known physiological condition

  4. 4

    Code F05

    Delirium due to known physiological condition

Documentation details

Notes for this 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

Code first

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

Use additional code

No “use additional code” instruction is listed for F05.

Excludes1

Conditions that should not be reported together with this code.

  • delirium NOS (R41.0)

Excludes2

Conditions not included here that may be reported separately when present.

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

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code F05 mean?

F05 is the FY 2027 U.S. ICD-10-CM code for “Delirium due to known physiological condition.”

Is F05 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, F05 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is F05 located in ICD-10-CM?

F05 is listed in Chapter 5, Mental, Behavioral and Neurodevelopmental disorders (F01-F99), within Mental disorders due to known physiological conditions (F01-F09) (F01–F09), under category F05, Delirium due to known physiological condition.

What coding notes are listed for F05?

Its listed inclusion terms are 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. Code-first instructions: the underlying physiological condition, such as:; dementia (F03.9-). Excludes1 notes: delirium NOS (R41.0). Excludes2 notes: delirium tremens alcohol-induced or unspecified (F10.231, F10.921).

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