S21.439 - Puncture wound without foreign body of unspecified back wall of thorax with penetration into thoracic cavity S21.4 - Open wound of back wall of thorax with penetration into thoracic cavity S21.43 - Puncture wound without foreign body of back wall of thorax with penetration into thoracic cavity S21.439 - Puncture wound without foreign body of unspecified back wall of thorax with penetration into thoracic cavity