Schizophrenia classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1];Associate Editor(s)-in-Chief: Vindhya BellamKonda, M.B.B.S [2]

Classification Based on Subtypes

Historically, schizophrenia in the West was classified into simple, catatonic, hebephrenic (now known as disorganized), and paranoid. The DSM- IV contains five sub-classifications of schizophrenia: Paranoid, disorganized, catatonic, undifferentiated and residual type, but, this classification has been eliminated due to their limited diagnostic stability, low reliability and poor validity.

The ICD-10 recognises a further two subtypes:

• Post-schizophrenic depression: A depressive episode arising in the aftermath of a schizophrenic illness where some low-level schizophrenic symptoms may still be present (ICD code F20.4)
• Simple schizophrenia: Insidious but progressive development of prominent negative symptoms with no history of psychotic episodes (ICD code F20.6)