ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.11 > S23.111 S23.111 Dislocation of T1/T2 thoracic vertebra Non-Billable/Non-Specific Codes S23.111A..., initial encounterS23.111D..., subsequent encounterS23.111S..., sequela