ICD-10-CM > S00-T88 > T36-T50 > T42 > T42.8 > T42.8X > T42.8X4 T42.8X4 Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined Non-Billable/Non-Specific Codes T42.8X4A..., initial encounterT42.8X4D..., subsequent encounterT42.8X4S..., sequela