Substance/Medication-Induced Anxiety Disorder 227
time heavy use of the substance), then the 4th position character is “9,” and the clinician
should record only the substance-induced anxiety disorder.
Specify if (see Table 1 in the chapter “Substance-Related and Addictive Disorders” for di-
agnoses associated with substance class):
With onset during intoxication: This specifier applies if criteria are met for intoxica-
tion with the substance and the symptoms develop during intoxication.
With onset during withdrawal:  This specifier applies if criteria are met for withdrawal
from the substance and the symptoms develop during, or shortly after, withdrawal.
With onset after medication use:  Symptoms may appear either at initiation of medi-
cation or after a modification or change in use.
Recording Procedures
ICD-9-CM. The name of the substance/medicati on-induced anxiety disorder begins
with the specific substance (e.g ., cocaine, salbutamol) that is  presumed to be causing the
anxiety symptoms. The diagnostic code is sele cted from the table included in the criteria
set, which is based on the drug class. For substa nces that do not fit into any of the classes
(e.g., salbutamol), the code for “other substance” should be used; and in cases in which
a substance is judged to be an etiological fact or but the specific class of substance is un-
known, the category “unknown substance” should be used.
The name of the disorder is followed by the specification of onset (i.e., onset during in-
toxication, onset during withdr awal, with onset duri ng medication use). Unlike the record-
ing procedures for ICD-10-CM, which comb ine the substance-induced disorder and