ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.1 > T40.1X > T40.1X1 T40.1X1 Poisoning by heroin, accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by heroin NOS Codes T40.1X1A..., initial encounterT40.1X1D..., subsequent encounterT40.1X1S..., sequela