ICD-10-CM > S00-T88 > T36-T50 > T40 > T40.3 > T40.3X T40.3X Poisoning by, adverse effect of and underdosing of methadone Non-Billable/Non-Specific Codes T40.3X1Poisoning by methadone, accidental (unintentional)T40.3X1A..., initial encounterT40.3X1D..., subsequent encounterT40.3X1S..., sequelaT40.3X2Poisoning by methadone, intentional self-harmT40.3X2A..., initial encounterT40.3X2D..., subsequent encounterT40.3X2S..., sequelaT40.3X3Poisoning by methadone, assaultT40.3X3A..., initial encounterT40.3X3D..., subsequent encounterT40.3X3S..., sequelaT40.3X4Poisoning by methadone, undeterminedT40.3X4A..., initial encounterT40.3X4D..., subsequent encounterT40.3X4S..., sequelaT40.3X5Adverse effect of methadoneT40.3X5A..., initial encounterT40.3X5D..., subsequent encounterT40.3X5S..., sequelaT40.3X6Underdosing of methadoneT40.3X6A..., initial encounterT40.3X6D..., subsequent encounterT40.3X6S..., sequela