ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.4 > T40.49 > T40.494 T40.494 Poisoning by other synthetic narcotics, undetermined Non-Billable/Non-Specific Codes T40.494A..., initial encounterT40.494D..., subsequent encounterT40.494S..., sequela