ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.4 > T40.41 > T40.412 T40.412 Poisoning by fentanyl or fentanyl analogs, intentional self-harm Non-Billable/Non-Specific Codes T40.412A..., initial encounterT40.412D..., subsequent encounterT40.412S..., sequela