ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.12 > S23.120 S23.120 Subluxation of T2/T3 thoracic vertebra Non-Billable/Non-Specific Codes S23.120A..., initial encounterS23.120D..., subsequent encounterS23.120S..., sequela