ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.9 > T40.99 > T40.994 T40.994 Poisoning by other psychodysleptics [hallucinogens], undetermined Non-Billable/Non-Specific Codes T40.994A..., initial encounterT40.994D..., subsequent encounterT40.994S..., sequela