S12.531 - Unspecified traumatic nondisplaced spondylolisthesis of sixth cervical vertebra S12.5 - Fracture of sixth cervical vertebra S12.53 - Unspecified traumatic spondylolisthesis of sixth cervical vertebra S12.531 - Unspecified traumatic nondisplaced spondylolisthesis of sixth cervical vertebra