Schizotypal Disorder (F21)
DSM-5-TR: Schizotypal Personality Disorder
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
F20-F29
Australian Prevalence
Estimated prevalence approximately 3-4% in the general population.
Global Prevalence
Prevalence approximately 3-4% worldwide.
Overview
Eccentric behaviour with anomalies of thinking and affect resembling schizophrenia, though no definite and characteristic schizophrenic anomalies have occurred at any stage. There is no dominant or typical disturbance but any of the following may be present: inappropriate or constricted affect, odd or eccentric behaviour, tendency to social withdrawal, paranoid or bizarre ideas, and occasional transient quasi-psychotic episodes.
Classification Boundaries
Includes
- Latent schizophrenic reaction
- Latent schizophrenia
- Prepsychotic schizophrenia
- Prodromal schizophrenia
- Pseudoneurotic schizophrenia
- Pseudopsychopathic schizophrenia
- Schizotypal personality disorder
Excludes1 (coded elsewhere)
- Schizophrenia (F20)
- Schizoid personality disorder (F60.1)
- Asperger syndrome (F84.5)
Australian Clinical Context
ICD-10-AM classifies schizotypal disorder under psychotic disorders (F20-F29), while DSM-5-TR classifies it as Schizotypal Personality Disorder under personality disorders. This classification difference is important for Australian clinicians using both systems.
Medicare (MBS) Pathways
Better Access to Mental Health Care
The primary Medicare pathway for mental health treatment in Australia. Requires a GP Mental Health Treatment Plan (MHTP) referral. Available for any clinically diagnosed mental disorder.
| Provider Type | MBS Items | Session Type |
|---|---|---|
| Clinical Psychologist | 80000–80025 | Psychological therapy (higher rebate) |
| Registered Psychologist | 80100–80123 | Focused psychological strategies |
| Occupational Therapist | 80125–80145 | Focused psychological strategies |
| Social Worker | 80150–80175 | Focused psychological strategies |
| Psychiatrist | 291, 296–299, 300–308 | Psychiatric consultation |
Clinical Psychologist
Registered Psychologist
Occupational Therapist
Social Worker
GP referral items: 2700, 2701, 2715, 2717
Eligibility: Any clinically diagnosed mental disorder as defined by WHO ICD-10 Chapter V. Requires a GP or psychiatrist referral.
Exclusions:
- Intellectual disability (use Complex Neurodevelopmental Disorder pathway or specialist referral)
- Dementia and organic mental disorders (use specialist referral pathway)
- Tobacco use disorder
Psychiatrist-led care is the primary pathway.
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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
In DSM-5-TR, this is classified as Schizotypal Personality Disorder under personality disorders. ICD-10-AM places it with schizophrenia spectrum disorders. Document the specific symptoms present and their duration.
Related Diagnostic Codes
ICD-10-AM diagnostic codes commonly associated with the Schizotypal Disorder (F21).
References
- World Health Organization. ICD-10-AM.
- American Psychiatric Association. DSM-5-TR. 2022.
Clinical Scoring Calculator — Not a Diagnostic Tool
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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