S12.55 - Other traumatic spondylolisthesis of sixth cervical vertebra S12.5 - Fracture of sixth cervical vertebra S12.55 - Other traumatic spondylolisthesis of sixth cervical vertebra S12.550 - Other traumatic displaced spondylolisthesis of sixth cervical vertebra S12.551 - Other traumatic nondisplaced spondylolisthesis of sixth cervical vertebra