Differences – Acute and transient psychotic disorders

DSM-5 includes 2 types of psychotic disorders with required duration below the 6-months criterion for schizophrenia: Schizophreniform disorder (=/> 1 month, < 6 months) and (Brief psychotic disorder (=/> 1 day, < 1 month). Brief psychotic disorder resembles with its sudden onset and relative good acute prognosis the ICD-11 ATPD.
‘Schizophreniform disorder‘ would be diagnosed in ICD-11 either as ‘Schizophrenia‘ or ‘Other specified schizophrenia or other primary psychotic disorders‘ (6A2Y) or ‘Schizophrenia or other primary psychotic disorders, unspecified‘ (6A2Z). According to the changes made from ICD-10 to ICD-11 for ATPD, schizophrenia-like symptom manifestations below one month duration would go into one of the ‘Other primary psychotic disorders‘ instead of into ATPD.