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ICD-10 Guide
ICD-10 CodesS21.42

S21.42

Billable

Laceration with foreign body of back wall of thorax with penetration into thoracic cavity

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/23/2025

Code Description

ICD-10 S21.42 is a billable code used to indicate a diagnosis of laceration with foreign body of back wall of thorax with penetration into thoracic cavity.

Key Diagnostic Point:

S21.42 describes a traumatic injury characterized by a laceration of the back wall of the thorax that has penetrated into the thoracic cavity, often due to a foreign body such as a knife or bullet. This type of injury can lead to serious complications, including pneumothorax (air in the pleural space), hemothorax (blood in the pleural space), and potential damage to vital thoracic structures such as the lungs, heart, and major blood vessels. The presence of a foreign body complicates the clinical picture, as it may necessitate surgical intervention to remove the object and repair any damage. Patients may present with respiratory distress, chest pain, and signs of shock, requiring immediate assessment and management. Imaging studies, such as chest X-rays or CT scans, are often employed to evaluate the extent of the injury and guide treatment decisions. Surgical interventions may include thoracotomy or video-assisted thoracoscopic surgery (VATS) to address the injury and prevent further complications.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Presence of foreign body complicates diagnosis and treatment.
  • Potential for multiple associated injuries (e.g., rib fractures, pneumothorax).
  • Requires detailed documentation of the mechanism of injury.
  • Involves surgical intervention, which must be accurately coded.

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury.
  • Failure to document associated injuries (e.g., pneumothorax, hemothorax).
  • Misclassification of the type of laceration.
  • Inaccurate coding of surgical procedures performed.

Specialty Focus

Medical Specialties

Trauma Surgery

Documentation Requirements

Detailed operative reports and imaging studies must be included to support the diagnosis and treatment.

Common Clinical Scenarios

Management of penetrating chest trauma, surgical repair of thoracic injuries.

Billing Considerations

Documentation must clearly outline the extent of the injury and any foreign bodies present.

Emergency Medicine

Documentation Requirements

Thorough initial assessment notes, including vital signs and imaging results.

Common Clinical Scenarios

Initial evaluation and stabilization of patients with chest trauma.

Billing Considerations

Accurate recording of the mechanism of injury and immediate interventions performed.

Coding Guidelines

Inclusion Criteria

Use S21.42 When
  • According to ICD
  • CM guidelines, S21
  • 42 should be used when there is a documented laceration with a foreign body that has penetrated the thoracic cavity
  • Coders must ensure that the documentation supports the diagnosis and includes details about the foreign body and any associated injuries

Exclusion Criteria

Do NOT use S21.42 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

32000CPT Code

Thoracentesis

Clinical Scenario

Used when a patient presents with a hemothorax or pneumothorax.

Documentation Requirements

Document the indication for the procedure and any imaging performed.

Specialty Considerations

Emergency medicine specialists should ensure accurate coding of the procedure performed.

32100CPT Code

Thoracotomy

Clinical Scenario

Performed to repair a laceration with a foreign body in the thoracic cavity.

Documentation Requirements

Detailed operative report required.

Specialty Considerations

Trauma surgeons must document the extent of the injury and any foreign body removal.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of complex injuries like S21.42, improving the accuracy of claims and facilitating better patient care through detailed documentation of injuries and treatments.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of complex injuries like S21.42, improving the accuracy of claims and facilitating better patient care through detailed documentation of injuries and treatments.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of complex injuries like S21.42, improving the accuracy of claims and facilitating better patient care through detailed documentation of injuries and treatments.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the significance of coding S21.42 accurately?

Accurate coding of S21.42 is crucial for proper reimbursement, tracking of trauma cases, and ensuring that patients receive appropriate care based on the severity of their injuries.