ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.17 S23.17 Subluxation and dislocation of T12/L1 thoracic vertebra Non-Billable/Non-Specific Codes S23.170Subluxation of T12/L1 thoracic vertebraS23.170A..., initial encounterS23.170D..., subsequent encounterS23.170S..., sequelaS23.171Dislocation of T12/L1 thoracic vertebraS23.171A..., initial encounterS23.171D..., subsequent encounterS23.171S..., sequela