598 Neurocognitive Disorders
Specify if:
Hyperactive:  The individual has a hyperactive level of psychomotor activity that may be
accompanied by mood lability, agitation, and/or refusal to cooperate with medical care.
Hypoactive:  The individual has a hypoactive level of psychomotor activity that may be
accompanied by sluggishness and lethargy that approaches stupor.
Mixed level of activity: The individual has a normal level of psychomotor activity even
though attention and awareness are disturbed. Also includes individuals whose activity
level rapidly fluctuates.
Recording Procedures
Substance intoxication delirium
ICD-9-CM. The name of the substance/medication intoxication delirium begins with
the specific substance (e.g., co caine, dexamethasone) that is  presumed to be causing the
delirium. The diagnostic code is  selected from the table includ ed in the criteria set, which
is based on the drug class. For substances that do not fit into any of the classes (e.g., dexa-
methasone), the code for “other substance” should be used; and in cases in which a sub-
stance is judged to be an etiological factor but the specific class of substance is unknown,
the category “unknown substance” should be used.
The name of the disorder is followed by the course (i.e., acute, persistent), followed by
the specifier indicating level of psychomotor activity (i.e., hyperactive, hypoactive, mixed
level of activity). Unlike the recording proc edures for ICD-10-CM, which combine the sub-
stance/medication intoxication delirium and subs tance use disorder into a single code, for
ICD-9-CM a separate diagnostic code is give n for the substance use disorder. For example,