ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.3 > T40.3X > T40.3X5 T40.3X5 Adverse effect of methadone Non-Billable/Non-Specific Codes T40.3X5A..., initial encounterT40.3X5D..., subsequent encounterT40.3X5S..., sequela