ICD-10-CM > S00-T88 > S40-S49 > S43 > S43.2 > S43.22 > S43.221 S43.221 Posterior subluxation of right sternoclavicular joint Non-Billable/Non-Specific Codes S43.221A..., initial encounterS43.221D..., subsequent encounterS43.221S..., sequela