ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.4 S21.4 Open wound of back wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.40Unspecified open wound of back wall of thorax with penetration into thoracic cavityS21.401Unspecified open wound of right back wall of thorax with penetration into thoracic cavityS21.401A..., initial encounterS21.401D..., subsequent encounterS21.401S..., sequelaS21.402Unspecified open wound of left back wall of thorax with penetration into thoracic cavityS21.402A..., initial encounterS21.402D..., subsequent encounterS21.402S..., sequelaS21.409Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavityS21.409A..., initial encounterS21.409D..., subsequent encounterS21.409S..., sequelaS21.41Laceration without foreign body of back wall of thorax with penetration into thoracic cavityS21.411Laceration 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..., sequelaS21.42Laceration with foreign body of back wall of thorax with penetration into thoracic cavityS21.421Laceration with foreign body of right back wall of thorax with penetration into thoracic cavityS21.421A..., initial encounterS21.421D..., subsequent encounterS21.421S..., sequelaS21.422Laceration with foreign body of left back wall of thorax with penetration into thoracic cavityS21.422A..., initial encounterS21.422D..., subsequent encounterS21.422S..., sequelaS21.429Laceration with foreign body of unspecified back wall of thorax with penetration into thoracic cavityS21.429A..., initial encounterS21.429D..., subsequent encounterS21.429S..., sequelaS21.43Puncture wound without foreign body of back wall of thorax with penetration into thoracic cavityS21.431Puncture wound without foreign body of right back wall of thorax with penetration into thoracic cavityS21.431A..., initial encounterS21.431D..., subsequent encounterS21.431S..., sequelaS21.432Puncture wound without foreign body of left back wall of thorax with penetration into thoracic cavityS21.432A..., initial encounterS21.432D..., subsequent encounterS21.432S..., sequelaS21.439Puncture wound without foreign body of unspecified back wall of thorax with penetration into thoracic cavityS21.439A..., initial encounterS21.439D..., subsequent encounterS21.439S..., sequelaS21.44Puncture wound with foreign body of back wall of thorax with penetration into thoracic cavityS21.441Puncture wound with foreign body of right back wall of thorax with penetration into thoracic cavityS21.441A..., initial encounterS21.441D..., subsequent encounterS21.441S..., sequelaS21.442Puncture wound with foreign body of left back wall of thorax with penetration into thoracic cavityS21.442A..., initial encounterS21.442D..., subsequent encounterS21.442S..., sequelaS21.449Puncture wound with foreign body of unspecified back wall of thorax with penetration into thoracic cavityS21.449A..., initial encounterS21.449D..., subsequent encounterS21.449S..., sequelaS21.45Open bite of back wall of thorax with penetration into thoracic cavityS21.451Open bite of right back wall of thorax with penetration into thoracic cavityS21.451A..., initial encounterS21.451D..., subsequent encounterS21.451S..., sequelaS21.452Open bite of left back wall of thorax with penetration into thoracic cavityS21.452A..., initial encounterS21.452D..., subsequent encounterS21.452S..., sequelaS21.459Open bite of unspecified back wall of thorax with penetration into thoracic cavityS21.459A..., initial encounterS21.459D..., subsequent encounterS21.459S..., sequela