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
S21.431 - Puncture wound without foreign body of right back wall of thorax with penetration into thoracic cavity
S21.432 - Puncture wound without foreign body of left 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