ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.6 > S63.62 > S63.621 S63.621 Sprain of interphalangeal joint of right thumb Non-Billable/Non-Specific Codes S63.621A..., initial encounterS63.621D..., subsequent encounterS63.621S..., sequela