Table 2.

Algorithm 2 case definition variables.

EHRa data variable	Criteria for suspected opioid use disorder
Chief complaint	Reason for visit contains the words heroin; opiate; opioid Reason for visit comment contains the word narcan
Diagnosis description	Not Algorithm 1 positive, that is, does not contain ICD-10b codes F11 or T40. 0-40.6 listed in Table 1 Does not contain the words alcohol, EtOH, benzodiazepine

^aEHR: electronic health record.

^bICD-10: International Classification of Diseases, Tenth Revision.