Undifferentiated Schizophrenia Diagnostic Criteria

Please see our separate note on Treatment, Mental Disorders and Basic Science for important caveats on the role and definition of diagnostic criteria.

ICD-10 Criteria for Undifferentiated Schizophrenia

The following information is reproduced verbatim from the ICD-10 Classification of Mental and Behavioural Disorders, World Health Organization, Geneva, 1992.

F20.3 Undifferentiated Schizophrenia

Conditions meeting the general diagnostic criteria for schizophrenia (see introduction to F20 above) but not conforming to any of the above subtypes, or exhibiting the features of more than one of them without a clear predominance of a particular set of diagnostic characteristics. This rubric should be used only for psychotic conditions (i.e. residual schizophrenia and post-schizophrenic depression are excluded) and after an attempt has been made to classify the condition into one of the three preceding categories.

Diagnostic Guidelines

This category should be reserved for disorders that:

1. meet the diagnostic criteria for schizophrenia;
2. do not satisfy the criteria for the paranoid, hebephrenic, or catatonic subtypes;
3. do not satisfy the criteria for residual schizophrenia or post-schizophrenic depression.

Includes:

• atypical schizophrenia