ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.3 > T40.3X > T40.3X2 T40.3X2 Poisoning by methadone, intentional self-harm Non-Billable/Non-Specific Codes T40.3X2A..., initial encounterT40.3X2D..., subsequent encounterT40.3X2S..., sequela