All ICD10 Codes
S21Non-billable

Open wound of thorax

Injury, Poisoning and Certain Other Consequences of External Causes·Injuries to the thorax (S20-S29)·category·FY 2026

Use a more specific code (0 billable, 6 non-billable)
S21.0Open wound of breasthas subcodesS21.1Open wound of front wall of thorax without penetration into thoracic cavityhas subcodesS21.2Open wound of back wall of thorax without penetration into thoracic cavityhas subcodesS21.3Open wound of front wall of thorax with penetration into thoracic cavityhas subcodesS21.4Open wound of back wall of thorax with penetration into thoracic cavityhas subcodesS21.9Open wound of unspecified part of thoraxhas subcodes

CH19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
Use Additional Code
  • code to identify any retained foreign body, if applicable (Z18.-)

S20-S29 Parent Instructions

Includes
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area
Excludes2(Not included here. Code separately if applicable.)
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • traumatic amputation (partial) of thorax (S28.1)
Code Also
  • any associated injury, such as:
  • injury of heart (S26.-)
  • injury of intrathoracic organs (S27.-)
  • rib fracture (S22.3-, S22.4-)
  • spinal cord injury (S24.0-, S24.1-)
  • traumatic hemopneumothorax (S27.3)
  • traumatic hemothorax (S27.1)
  • traumatic pneumothorax (S27.0)
  • wound infection

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
S20-S29Injuries to the thorax (S20-S29)
S21Open wound of thoraxNot billable
S21.0Open wound of breastSubcodes
S21.1Open wound of front wall of thorax without penetration into thoracic cavitySubcodes
S21.2Open wound of back wall of thorax without penetration into thoracic cavitySubcodes
S21.3Open wound of front wall of thorax with penetration into thoracic cavitySubcodes
S21.4Open wound of back wall of thorax with penetration into thoracic cavitySubcodes
S21.9Open wound of unspecified part of thoraxSubcodes

MS-DRG Classification

2026

No direct MS-DRG triggers identified.