ICD-10-CM > S00-T88 > S10-S19 > S13 > S13.1 > S13.18 > S13.181 S13.181 Dislocation of C7/T1 cervical vertebrae Non-Billable/Non-Specific Codes S13.181A..., initial encounterS13.181D..., subsequent encounterS13.181S..., sequela