ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.6 > S63.63 > S63.635 S63.635 Sprain of interphalangeal joint of left ring finger Non-Billable/Non-Specific Codes S63.635A..., initial encounterS63.635D..., subsequent encounterS63.635S..., sequela