ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.6 > S63.64 > S63.641 S63.641 Sprain of metacarpophalangeal joint of right thumb Non-Billable/Non-Specific Codes S63.641A..., initial encounterS63.641D..., subsequent encounterS63.641S..., sequela