ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.4 > T40.49 T40.49 Poisoning by, adverse effect of and underdosing of other synthetic narcotics Non-Billable/Non-Specific Codes T40.491Poisoning by other synthetic narcotics, accidental (unintentional)T40.491A..., initial encounterT40.491D..., subsequent encounterT40.491S..., sequelaT40.492Poisoning by other synthetic narcotics, intentional self-harmT40.492A..., initial encounterT40.492D..., subsequent encounterT40.492S..., sequelaT40.493Poisoning by other synthetic narcotics, assaultT40.493A..., initial encounterT40.493D..., subsequent encounterT40.493S..., sequelaT40.494Poisoning by other synthetic narcotics, undeterminedT40.494A..., initial encounterT40.494D..., subsequent encounterT40.494S..., sequelaT40.495Adverse effect of other synthetic narcoticsT40.495A..., initial encounterT40.495D..., subsequent encounterT40.495S..., sequelaT40.496Underdosing of other synthetic narcoticsT40.496A..., initial encounterT40.496D..., subsequent encounterT40.496S..., sequela