ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.12 > S23.122 S23.122 Subluxation of T3/T4 thoracic vertebra Non-Billable/Non-Specific Codes S23.122A..., initial encounterS23.122D..., subsequent encounterS23.122S..., sequela