ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.6 > T43.63 > T43.631 T43.631 Poisoning by methylphenidate, accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by methylphenidate NOS Codes T43.631A..., initial encounterT43.631D..., subsequent encounterT43.631S..., sequela