ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.11 > S23.110 S23.110 Subluxation of T1/T2 thoracic vertebra Non-Billable/Non-Specific Codes S23.110A..., initial encounterS23.110D..., subsequent encounterS23.110S..., sequela