S12.631 - Unspecified traumatic nondisplaced spondylolisthesis of seventh cervical vertebra S12.6 - Fracture of seventh cervical vertebra S12.63 - Unspecified traumatic spondylolisthesis of seventh cervical vertebra S12.631 - Unspecified traumatic nondisplaced spondylolisthesis of seventh cervical vertebra