ICD-10-CM > M00-M99 > M45-M49 > M47 > M47.0 > M47.02 M47.02 Vertebral artery compression syndromes Non-Billable/Non-Specific Codes M47.021Vertebral artery compression syndromes, occipito-atlanto-axial regionM47.022Vertebral artery compression syndromes, cervical regionM47.029Vertebral artery compression syndromes, site unspecified