ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.4 > S21.41 S21.41 Laceration without foreign body of back wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.411Laceration without foreign body of right back wall of thorax with penetration into thoracic cavityS21.411A..., initial encounterS21.411D..., subsequent encounterS21.411S..., sequelaS21.412Laceration without foreign body of left back wall of thorax with penetration into thoracic cavityS21.412A..., initial encounterS21.412D..., subsequent encounterS21.412S..., sequelaS21.419Laceration without foreign body of unspecified back wall of thorax with penetration into thoracic cavityS21.419A..., initial encounterS21.419D..., subsequent encounterS21.419S..., sequela