| Full description | Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity |
| Billable | No — use a more specific child code |
| Chapter | Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88) |
| Section | Injuries to the thorax (S20-S29) |
| Parent code | S21.40 — Unsp opn wnd back wall of thorax w penet thoracic cavity |
| Requires 7th character | Yes |