Table 1.

ICD-10-CM Parent Codes Indicative of IDU

ICD-10-CM Code	Description
F11.x	Opioid-related disorders
F14.x	Cocaine-related disorder
F15.x	Other stimulant-related disorder
F19.x	Other psychoactive substance use
T40.0x	Poisoning by adverse effect of and underdosing of opium
T40.1x	Poisoning by and adverse effect of heroin
T40.2x	Poisoning by adverse effect of and underdosing of other opioids
T40.3x	Poisoning by adverse effect of and underdosing of methadone
T40.4x	Poisoning by adverse effect of and underdosing of other synthetic narcotics
T40.5x	Poisoning by adverse effect of and underdosing of cocaine
T40.6x	Poisoning by adverse effect of and underdosing of other and unspecified narcotics
T43.6x	Poisoning by adverse effect of and underdosing of psychostimulants

Source: Authors’ analysis of codes based off clinical experience.

Abbreviations: ICD-10-CM, International Classification of Diseases, 10th Revision, Clinical Modification; IDU, injection drug use.