Undifferentiated Schizophrenia Diagnostic Criteria

The formal ICD diagnosis of undifferentiated schizophrenia rests on these symptoms, which can be evaluated by psychiatrists and other mental health professionals.

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. (Since the WHO updates the overall ICD on a regular basis, individual classifications within it may or may not change from year to year; therefore, you should always check directly with the WHO to be sure of obtaining the latest revision for any particular individual classification.)

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.


  • atypical schizophrenia

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Our material is not intended as a substitute for direct consultation with a qualified mental health professional. Please seek professional advice if you are experiencing any mental health concern.

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