ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.2 > S63.23 > S63.231 S63.231 Subluxation of proximal interphalangeal joint of left index finger Non-Billable/Non-Specific Codes S63.231A..., initial encounterS63.231D..., subsequent encounterS63.231S..., sequela