ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.9 > T43.91 T43.91 Poisoning by unspecified psychotropic drug, accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by psychotropic drug NOS Codes T43.91XA..., initial encounterT43.91XD..., subsequent encounterT43.91XS..., sequela