Certain infectious and parasitic diseases

F20.4 Post-schizophrenic depression
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).
F20.5 Residual schizophrenia
A chronic stage in the development of a schizophrenic illness in which there has
been a clear progression from an early stage to a later stage characterized by
long- term, though not necessarily irreversible, "negative" symptoms, e.g.
psychomotor slowing; underactivity; blunting of affect; passivity and lack of
initiative; poverty of quantity or content of speech; poor nonverbal
communication by facial expression, eye contact, voice modulation and posture;
poor self-care and social performance.
Chronic undifferentiated schizophrenia
Restzustand (schizophrenic)
Schizophrenic residual state
F20.6 Simple schizophrenia
A disorder in which there is an insidious but progressive development of
oddities of conduct, inability to meet the demands of society, and decline in
total performance. The characteristic negative features of residual
schizophrenia (e.g. blunting of affect and loss of volition) develop without
being preceded by any overt psychotic symptoms.
F20.8 Other schizophrenia
Cenesthopathic schizophrenia
Schizophreniform:
· disorder NOS
· psychosis NOS
Excludes: brief schizophreniform disorders ( F23.2 )
F20.9 Schizophrenia, unspecified
F21
Schizotypal disorder
A disorder characterized by eccentric behaviour and anomalies of thinking and
affect which resemble those seen in schizophrenia, though no definite and
characteristic schizophrenic anomalies occur at any stage. The symptoms may
include a cold or inappropriate affect; anhedonia; odd or eccentric behaviour; a
tendency to social withdrawal; paranoid or bizarre ideas not amounting to true
delusions; obsessive ruminations; thought disorder and perceptual disturbances;
occasional transient quasi-psychotic episodes with intense illusions, auditory or
other hallucinations, and delusion-like ideas, usually occurring without external
provocation. There is no definite onset and evolution and course are usually those
of a personality disorder.
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