Substance/Medication-Induced Major or Mild Neurocognitive Disorder 629
Specify if: 
Persistent:  Neurocognitive impairment continues to be significant after an extended
period of abstinence.
Recording Procedures
ICD-9-CM. The name of the substance/medication-i nduced neurocogniti ve disorder be-
gins with the specific substance/medication (e.g ., alcohol) that is presumed to be causing
the neurocognitive symptoms. Th e 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, the code for “other substance” should be used; and in cases in which a substance
is judged to be an etiological factor but the sp ecific class of substance is unknown, the cat-
egory “unknown substance” should be used.
The name of the disorder (i.e., [specific su bstance]-induced major neurocognitive dis-
order or [specific substance]-induced mild neurocognitive disorder) is followed by the
type in the case of alcohol (i.e., nonamnestic-confabulatory type, amnestic-confabulatory
type), followed by specification of duration (i .e., persistent). Unlike the recording procedures
for ICD-10-CM, which combine the substanc e/medication-induced disorder and sub-
stance use disorder into a single code, for ICD-9-CM a separate diagnostic code is given for
the substance use disorder. For example, in th e case of persistent amnestic-confabulatory
symptoms in a man with a severe alcohol use disorder, the diagnosis is 291.1 alcohol-
induced major neurocognitive d isorder, amnestic-confabulatory type, persistent. An addi-