ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.6 > T40.60 > T40.604 T40.604 Poisoning by unspecified narcotics, undetermined Non-Billable/Non-Specific Codes T40.604A..., initial encounterT40.604D..., subsequent encounterT40.604S..., sequela