ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.6 > S63.63 > S63.639 S63.639 Sprain of interphalangeal joint of unspecified finger Non-Billable/Non-Specific Codes S63.639A..., initial encounterS63.639D..., subsequent encounterS63.639S..., sequela