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