ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.9 > T50.90 > T50.904 T50.904 Poisoning by unspecified drugs, medicaments and biological substances, undetermined Non-Billable/Non-Specific Codes T50.904A..., initial encounterT50.904D..., subsequent encounterT50.904S..., sequela