ICD-10 Diagnosis Code F05

Delirium due to known physiological condition

Diagnosis Code F05

ICD-10: F05
Short Description: Delirium due to known physiological condition
Long Description: Delirium due to known physiological condition
This is the 2018 version of the ICD-10-CM diagnosis code F05

Valid for Submission
The code F05 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Mental and behavioural disorders (F00–F99)
    • Mental disorders due to known physiological conditions (F01-F09)
      • Delirium due to known physiological condition (F05)

Information for Medical Professionals

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The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Acute confusional state, of endocrine origin
  • Acute confusional state, of infective origin
  • Acute confusional state, of metabolic origin
  • Acute confusional state, post-traumatic
  • Delirium of mixed origin
  • Postseizure confusion
  • Postseizure delirium
  • Senile dementia with delirium
  • Sundowning
  • Toxic confusional state

Index of Diseases and Injuries
References found for the code F05 in the Index of Diseases and Injuries:

Information for Patients


Delirium is a condition that features rapidly changing mental states. It causes confusion and changes in behavior. Besides falling in and out of consciousness, there may be problems with

  • Attention and awareness
  • Thinking and memory
  • Emotion
  • Muscle control
  • Sleeping and waking

Causes of delirium include medications, poisoning, serious illnesses or infections, and severe pain. It can also be part of some mental illnesses or dementia.

Delirium and dementia have similar symptoms, so it can be hard to tell them apart. They can also occur together. Delirium starts suddenly and can cause hallucinations. The symptoms may get better or worse, and can last for hours or weeks. On the other hand, dementia develops slowly and does not cause hallucinations. The symptoms are stable, and may last for months or years.

Delirium tremens is a serious type of alcohol withdrawal syndrome. It usually happens to people who stop drinking after years of alcohol abuse.

People with delirium often, though not always, make a full recovery after their underlying illness is treated.

  • Delirium (Medical Encyclopedia)
  • Delirium tremens (Medical Encyclopedia)

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