T40.0X6Non-Billable (Header)Underdosing of opiumCode Hierarchy└T40Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]└T40.0Poisoning by, adverse effect of and underdosing of opium└T40.0XPoisoning by, adverse effect of and underdosing of opium└T40.0X6Underdosing of opium└T40.0X6Underdosing of opium