Schizophrenia in DSM-5-TR and ICD-11
Both systems recognize schizophrenia as a psychotic disorder marked by hallucinations, delusions, disorganized speech, disorganized behavior, and negative symptoms. The classical DSM subtypes (paranoid, disorganized, catatonic, etc.) were removed in DSM-5. ICD-11 followed suit and also removed them. Duration thresholds and specifiers still differ.
DSM-5-TR Schizophrenia ICD-10-CM F20.9
ICD-11 Schizophrenia 6A20
Side by side
| What | DSM-5-TR | ICD-11 |
|---|---|---|
| Required symptoms Aligned in structure. ICD-11 explicitly lists experiences of influence/passivity as core Schneiderian symptoms. | 2 or more of: delusions, hallucinations, disorganized speech, grossly disorganized or catatonic behavior, negative symptoms. At least one must be delusions, hallucinations, or disorganized speech. | At least 2 of: delusions, hallucinations, disorganized thinking (formal thought disorder), experiences of influence, passivity, or control, negative symptoms, grossly disorganized behavior, psychomotor disturbances (e.g., catatonia). At least one must be a core positive symptom or disorganization. |
| Duration This is a real difference. ICD-11 requires only 1 month; DSM-5-TR requires 6 months total, including 1 month of active phase. | Signs of the disturbance persist for at least 6 months, including at least 1 month of active-phase symptoms. | Symptoms persist for at least 1 month. |
| Impairment requirement Aligned in principle. DSM-5-TR is more explicit about baseline comparison. | For a significant portion of the time since onset, level of functioning is markedly below the level achieved prior to onset. | The disorder causes significant impairment in personal, family, social, educational, occupational, or other important areas. |
| Schizoaffective and mood-related exclusion Aligned. | Schizoaffective disorder and mood disorders with psychotic features have been ruled out. | Same. |
| Substance or medical exclusion Aligned. | Symptoms are not attributable to a substance or another medical condition. | Same. |
| Autism/childhood exclusion Aligned. | If there is a history of autism spectrum disorder or a communication disorder of childhood onset, additional diagnosis of schizophrenia is made only if prominent delusions or hallucinations are also present for at least 1 month. | Similar language in the diagnostic requirements. |
| Subtypes Aligned. Both systems moved to dimensional specifiers instead. | Removed in DSM-5 (paranoid, disorganized, catatonic, undifferentiated, residual are no longer used). | Removed in ICD-11 (aligned change). |
| Symptom dimensions / specifiers ICD-11 has more explicit symptom dimensions; DSM-5-TR uses similar ratings but as an appendix. | Course specifiers (first episode, multiple episodes, continuous, in remission). Severity ratings for individual symptom domains available. | Course specifiers (first episode, multiple episodes, continuous). Symptomatic manifestations rated across 6 dimensions: positive, negative, depressive, manic, psychomotor, cognitive. |
Key differences
- Duration is the biggest difference. DSM-5-TR requires 6 months of symptoms including 1 month of active phase. ICD-11 requires only 1 month of active symptoms.
- ICD-11 explicitly lists experiences of influence/passivity as core Schneiderian symptoms alongside delusions and hallucinations. DSM-5-TR treats these as delusions.
- Both systems removed the classical subtypes (paranoid, disorganized, catatonic, etc.) and moved to dimensional specifiers. This was a shared change.
- ICD-11 uses more explicit symptom dimension ratings (positive, negative, depressive, manic, psychomotor, cognitive). DSM-5-TR uses similar ratings but as an appendix rather than main text.
Clinical implications
- The 6-month vs 1-month duration difference is the main source of cross-system disagreement. A person meeting ICD-11 schizophrenia criteria at 6 weeks may not yet meet DSM-5-TR criteria; they might carry a diagnosis of schizophreniform disorder (ICD-10-CM F20.81) until they cross 6 months.
- Schizophreniform disorder in DSM-5-TR (essentially schizophrenia short of the 6-month duration) has no direct equivalent in ICD-11.
- First-episode treatment principles are similar across systems: antipsychotic medication, psychosocial support, family psychoeducation. Duration of untreated psychosis affects long-term outcome regardless of which system is used.
- For international research, the shorter ICD-11 duration threshold means larger reported prevalence. Meta-analyses are increasingly reporting both.
## Why this crosswalk exists
The duration difference for schizophrenia between DSM-5-TR (6 months) and ICD-11 (1 month) is the largest practical difference between the two systems for any psychotic disorder. This affects early-intervention research, prevalence estimates, and time to definitive diagnosis. Understanding both is important for any clinician working across international settings.
## Sources
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR). Section on Schizophrenia Spectrum and Other Psychotic Disorders. 2022.
- World Health Organization. International Classification of Diseases 11th Revision (ICD-11). Chapter 6, 6A20 Schizophrenia. 2022.
- Gaebel W. Status of psychotic disorders in ICD-11. Schizophrenia Bulletin. 2012;38(5):895-898.
- Reed GM, First MB, Kogan CS, et al. Innovations and changes in the ICD-11 classification of mental, behavioural and neurodevelopmental disorders. World Psychiatry. 2019;18(1):3-19.
- Biedermann F, Fleischhacker WW. Psychotic disorders in DSM-5 and ICD-11. CNS Spectrums. 2016;21(4):349-354.