T50.996 - Underdosing of other drugs, medicaments and biological substances T50.9 - Poisoning by, adverse effect of and underdosing of other and unspecified drugs, medicaments and biological substances T50.99 - Poisoning by, adverse effect of and underdosing of other drugs, medicaments and biological substances T50.996 - Underdosing of other drugs, medicaments and biological substances