T40.4X1 - Poisoning by other synthetic narcotics, accidental (unintentional) T40.4 - Poisoning by, adverse effect of and underdosing of other synthetic narcotics T40.4X - Poisoning by, adverse effect of and underdosing of other synthetic narcotics T40.4X1 - Poisoning by other synthetic narcotics, accidental (unintentional)