F20.4Post-schizophrenic depression
Code usage status
Primary diagnosis
May be used as the primary diagnosis
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Complete code in the classification
Use when the diagnosis matches and no exclusion applies.
- Chapter V
- Mental and behavioural disorders
- Group F20-F29
- Schizophrenia, schizotypal and delusional disorders
- Official Vietnamese name
- Tâm thần phân liệt thể trầm cảm sau phân liệt
- Additional WHO coding guidance
- A depressive episode, which may be prolonged, arising in the aftermath of a schizophrenic illness. Some schizophrenic symptoms, either "positive" or "negative", must still be present but they no longer dominate the clinical picture. These depressive states are associated with an increased risk of suicide. If the patient no longer has any schizophrenic symptoms, a depressive episode should be diagnosed (F32.-). If schizophrenic symptoms are still florid and prominent, the diagnosis should remain that of the appropriate schizophrenic subtype (F20.0-F20.3).
Related F20 codes
F20
Schizophrenia
F20.0
Primary diagnosis candidate
Paranoid schizophrenia
F20.1
Primary diagnosis candidate
Hebephrenic schizophrenia
F20.2
Primary diagnosis candidate
Catatonic schizophrenia
F20.3
Primary diagnosis candidate
Undifferentiated schizophrenia
F20.5
Primary diagnosis candidate
Residual schizophrenia
F20.6
Primary diagnosis candidate
Simple schizophrenia
F20.8
Primary diagnosis candidate
Other schizophrenia Cenesthopathic
F20.9
Primary diagnosis candidate
Schizophrenia, unspecified
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
