2025 ICD-10-CM Diagnosis Code F05

Delirium due to known physiological condition

• F05 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2025 edition of ICD-10-CM F05 became effective on October 1, 2024.
• This is the American ICD-10-CM version of F05 – other international versions of ICD-10 F05 may differ.

Applicable To

• 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-)

Type 1 Excludes

• delirium NOS (R41.0)

Type 2 Excludes

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

The following code(s) above F05 contain annotation back-references

 that may be applicable to F05:

• F01-F99  Mental, Behavioral and Neurodevelopmental disorders
• F01-F09  Mental disorders due to known physiological conditions

Approximate Synonyms

• Alzheimer’s disease with behavioral disturbance and delerium
• Alzheimer’s disease with delerium
• Alzheimers dementia w behavioral disturbance w delirium
• Alzheimers dementia with delirium
• Alzheimers dementia, early onset, w delirium
• Alzheimers dementia, late onset, w delirium
• Alzheimers dementia. With delirium
• Delirium due to multiple etiologies
• Delirium of mixed origin
• Dementia alzheimers type, late onset with delirium
• Dementia with behavioral disturbance and delerium
• Dementia with behavioral disturbance with delirium
• Dementia, presenile with delirium
• Dementia, primary degenerative, alzheimer type
• Dementia, senile with delirium
• Multi infarct dementia with delirium
• Presenile dementia with delirium
• Primary degenerative dementia of the alzheimer type, presenile onset, with delirium
• Primary degenerative dementia of the alzheimer type, senile onset, with delirium
• Senile dementia with delirium
• Vascular dementia w delirium

ICD-10-CM F05 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 880 Acute adjustment reaction and psychosocial dysfunction

Convert F05 to ICD-9-CMCode History

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change
• 2025 (effective 10/1/2024): No change

Code annotations containing back-references to F05:

• Type 1 Excludes: R41.0
• Type 2 Excludes: F03, F06
• Use Additional: T81.89, G30

Diagnosis Index entries containing back-references to F05:

• Confusion, confusedR41.0
  • epileptic F05
• Delirium, delirious (acute or subacute) (not alcohol- or drug-induced) R41.0
  • with
    • dementia F05 – see also Dementia
  • due to (secondary to)
    • general medical condition F05
    • multiple etiologies F05
  • postprocedural F05 (postoperative)
  • puerperal F05
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) F03.90
  • with
    • acute confusional state F05
• Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure) G40.909
  • twilight F05
• Insanity, insane – see also Psychosis
  • confusionalF28
    • acute or subacute F05
• Psychosis, psychoticF29
  • confusionalF29
    • acute or subacute F05
  • organicF09
    • due to or associated with
      • disease
        • endocrine or metabolicF06.8
          • acute or subacute F05
      • infection
        • brain (intracranial) F06.8
          • acute or subacute F05
      • trauma, brain (birth) (from electric current) (surgical) F06.8
        • acute or subacute F05
      • epilepsy transient F05 (acute)
    • infectiveF06.8
      • acute or subacute F05
    • post-traumaticF06.8
      • acute or subacute F05
  • infective F05 (acute) (subacute)
• Puerperal, puerperium (complicated by, complications)
  • delirium NEC F05
• Senile, senilityR41.81 – see also condition
  • with
    • acute confusional state F05
• State (of)
  • confusional (psychogenic) F44.89
    • acute – see also Delirium
      • with
        • senility or dementia F05
    • epileptic F05
  • twilight
    • epileptic F05
• Sundowning F05
• Syndrome – see also Disease
  • psycho-organic (nonpsychotic severity) F07.9
    • acute or subacute F05
• Twilight state
  • epileptic F05