ICD-10-CM > S00-T88 > S20-S29 > S23 > S23.1 > S23.13 S23.13 Subluxation and dislocation of T4/T5-T5/T6 thoracic vertebra Non-Billable/Non-Specific Codes S23.130Subluxation of T4/T5 thoracic vertebraS23.130A..., initial encounterS23.130D..., subsequent encounterS23.130S..., sequelaS23.131Dislocation of T4/T5 thoracic vertebraS23.131A..., initial encounterS23.131D..., subsequent encounterS23.131S..., sequelaS23.132Subluxation of T5/T6 thoracic vertebraS23.132A..., initial encounterS23.132D..., subsequent encounterS23.132S..., sequelaS23.133Dislocation of T5/T6 thoracic vertebraS23.133A..., initial encounterS23.133D..., subsequent encounterS23.133S..., sequela