ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.12 S23.12 Subluxation and dislocation of T2/T3-T3/T4 thoracic vertebra Non-Billable/Non-Specific Codes S23.120Subluxation of T2/T3 thoracic vertebraS23.120A..., initial encounterS23.120D..., subsequent encounterS23.120S..., sequelaS23.121Dislocation of T2/T3 thoracic vertebraS23.121A..., initial encounterS23.121D..., subsequent encounterS23.121S..., sequelaS23.122Subluxation of T3/T4 thoracic vertebraS23.122A..., initial encounterS23.122D..., subsequent encounterS23.122S..., sequelaS23.123Dislocation of T3/T4 thoracic vertebraS23.123A..., initial encounterS23.123D..., subsequent encounterS23.123S..., sequela