S21.219 - Laceration without foreign body of unspecified back wall of thorax without penetration into thoracic cavity S21.2 - Open wound of back wall of thorax without penetration into thoracic cavity S21.21 - Laceration without foreign body of back wall of thorax without penetration into thoracic cavity S21.219 - Laceration without foreign body of unspecified back wall of thorax without penetration into thoracic cavity