112 Schizophrenia Spectrum and Other Psychotic Disorders
Recording Procedures
ICD-9-CM. The name of the substance/medication -induced psychotic disorder begins
with the specific substance (e.g., cocaine, de xamethasone) that is presumed to be causing
the delusions or hallucinations. The diagnostic code is selected from the table included in
the criteria set, which is based on the drug clas s. For substances that do not fit into any of
the classes (e.g., dexamethasone), the code for “other substance” should be used; and in
cases in which a substance is judged to be an etiological factor but the specific class of sub-
stance is unknown, the category “u nknown substance” should be used.
The name of the disorder is followed by the sp ecification of onset (i.e., onset during in-
toxication, onset during with drawal). Unlike the recording procedures for ICD-10-CM,
which combine the substance-induced disorder and substance use disorder into a single
code, for ICD-9-CM a separate diagnostic code  is given for the substance use disorder. For
example, in the case of delusio ns occurring during intoxication in a man with a severe co-
caine use disorder, the diagnosis is 292.9 cocaine-induced psychotic disorder, with onset
during intoxication. An additional diagnosis of 304.20 severe cocaine use disorder is also
given. When more than one subs tance is judged to play a significant role in the development
of psychotic symptoms, each should be listed separately (e.g., 292.9 cannabis-induced psy-
chotic disorder with onset during intoxicati on, with severe cannabis use disorder; 292.9
phencyclidine-induced psychotic disorder, wi th onset during intoxication, with mild
phencyclidine use disorder).