ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.9 > T40.99 > T40.991 T40.991 Poisoning by other psychodysleptics [hallucinogens], accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by other psychodysleptics [hallucinogens] NOS Codes T40.991A..., initial encounterT40.991D..., subsequent encounterT40.991S..., sequela