ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.6 > S63.64 > S63.642 S63.642 Sprain of metacarpophalangeal joint of left thumb Non-Billable/Non-Specific Codes S63.642A..., initial encounterS63.642D..., subsequent encounterS63.642S..., sequela