Delirium Not Induced by Alcohol and Other Psychoactive Substances (F05)
DSM-5-TR: Delirium Due to Another Medical Condition
ICD-10-AM and DSM-5-TR may classify conditions differently. Refer to APA and WHO for complete diagnostic criteria.
Key Facts
ICD-10 Range
F00-F09
Subcodes
4 subcodes
Australian Prevalence
Affects up to 50% of hospitalised older adults. Incidence highest in ICU (up to 80%) and post-surgical settings.
Global Prevalence
Affects 10-31% of hospitalised general medical patients and up to 80% of ICU patients.
Overview
An aetiologically nonspecific organic cerebral syndrome characterised by concurrent disturbances of consciousness and attention, perception, thinking, memory, psychomotor behaviour, emotion, and the sleep-wake schedule. Duration is variable and severity ranges from mild to very severe.
ICD-10-AM Subcodes
| Code | Name | Description |
|---|---|---|
| F05.0 | Delirium not superimposed on dementia | |
| F05.1 | Delirium superimposed on dementia | |
| F05.8 | Other delirium | |
| F05.9 | Delirium, unspecified |
Classification Boundaries
Includes
- Acute or subacute confusional state (nonalcoholic)
- Acute or subacute organic reaction
- Acute or subacute psycho-organic syndrome
- Acute or subacute infective psychosis
Excludes1 (coded elsewhere)
- Delirium tremens (F10.4)
Australian Clinical Context
Delirium affects up to 50% of hospitalised older adults in Australia. The Australian Commission on Safety and Quality in Health Care has published a clinical care standard for delirium.
Medicare (MBS) Pathways
Specialist Referral Pathway
Conditions in this category do not have a structured allied health Medicare pathway. Treatment is typically managed through specialist psychiatrist or physician consultations, with additional support through state/territory services or NDIS.
| Provider Type | MBS Items | Session Type |
|---|---|---|
| Psychiatrist | 291, 296–299, 300–308 | Psychiatric consultation |
| Geriatrician / Physician | Standard specialist consultation items | Specialist medical consultation |
Geriatrician / Physician
GP referral items: Standard GP referral to specialist
Eligibility: Referral to specialist required. No structured allied health pathway under Medicare for these conditions.
Acute medical condition. Not covered by Better Access. Hospital and acute care pathways apply.
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Reference information sourced from MBS Online (mbsonline.gov.au). Item availability, rebates, and eligibility criteria may change. This is not billing advice — always verify current items before claiming. Last verified: April 2026.
Clinical Documentation Notes
Use validated tools such as the CAM (Confusion Assessment Method) for screening. Document onset, fluctuating course, inattention, and altered consciousness. Identify and treat underlying causes.
Related Diagnostic Codes
ICD-10-AM diagnostic codes commonly associated with the Delirium Not Induced by Alcohol and Other Psychoactive Substances (F05).
References
- World Health Organization. ICD-10-AM.
- American Psychiatric Association. DSM-5-TR. 2022.
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This tool calculates scores based on published guidelines for professional reference. It does not provide clinical diagnoses. Scores are provided as reference information only and should be interpreted by a qualified practitioner in the context of a comprehensive assessment.
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