ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.9 > T50.99 T50.99 Poisoning by, adverse effect of and underdosing of other drugs, medicaments and biological substances Non-Billable/Non-Specific Codes T50.991Poisoning by other drugs, medicaments and biological substances, accidental (unintentional)T50.991A..., initial encounterT50.991D..., subsequent encounterT50.991S..., sequelaT50.992Poisoning by other drugs, medicaments and biological substances, intentional self-harmT50.992A..., initial encounterT50.992D..., subsequent encounterT50.992S..., sequelaT50.993Poisoning by other drugs, medicaments and biological substances, assaultT50.993A..., initial encounterT50.993D..., subsequent encounterT50.993S..., sequelaT50.994Poisoning by other drugs, medicaments and biological substances, undeterminedT50.994A..., initial encounterT50.994D..., subsequent encounterT50.994S..., sequelaT50.995Adverse effect of other drugs, medicaments and biological substancesT50.995A..., initial encounterT50.995D..., subsequent encounterT50.995S..., sequelaT50.996Underdosing of other drugs, medicaments and biological substancesT50.996A..., initial encounterT50.996D..., subsequent encounterT50.996S..., sequela