S12.13 - Unspecified traumatic spondylolisthesis of second cervical vertebra S12.1 - Fracture of second cervical vertebra S12.13 - Unspecified traumatic spondylolisthesis of second cervical vertebra S12.130 - Unspecified traumatic displaced spondylolisthesis of second cervical vertebra S12.131 - Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra