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ICD-10 Guide
ICD-10 CodesS21.402

S21.402

Billable

Unspecified open wound of left back wall of thorax with penetration into thoracic cavity

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

Code Description

ICD-10 S21.402 is a billable code used to indicate a diagnosis of unspecified open wound of left back wall of thorax with penetration into thoracic cavity.

Key Diagnostic Point:

An unspecified open wound of the left back wall of the thorax with penetration into the thoracic cavity indicates a traumatic injury that has breached the thoracic wall, potentially leading to serious complications. This type of injury can result from various mechanisms, including blunt or penetrating trauma, such as gunshot wounds or stab injuries. The thoracic cavity houses vital organs, including the lungs and heart, and any penetration can lead to conditions such as pneumothorax (air in the pleural space), hemothorax (blood in the pleural space), or cardiac injuries. Clinical management may involve surgical intervention to repair the wound, drain fluid collections, or address any underlying organ damage. Accurate coding is essential for appropriate treatment planning and reimbursement, as well as for tracking trauma-related outcomes in clinical settings.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in documentation of the type and extent of the wound.
  • Potential for associated injuries (e.g., rib fractures, pneumothorax).
  • Need for precise anatomical localization.
  • Differentiation from similar codes for thoracic injuries.

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury.
  • Failure to document associated injuries.
  • Lack of clarity on the extent of the wound.
  • Inconsistent coding practices among providers.

Specialty Focus

Medical Specialties

Trauma Surgery

Documentation Requirements

Detailed descriptions of the injury mechanism, surgical interventions performed, and post-operative care.

Common Clinical Scenarios

Management of penetrating trauma, rib fractures, and thoracotomy procedures.

Billing Considerations

Ensure all associated injuries are documented to support coding for complications.

Emergency Medicine

Documentation Requirements

Accurate initial assessment of the injury, including vital signs and imaging results.

Common Clinical Scenarios

Initial evaluation and stabilization of patients with thoracic trauma.

Billing Considerations

Documenting the patient's response to treatment and any immediate interventions performed.

Coding Guidelines

Inclusion Criteria

Use S21.402 When
  • Follow official ICD
  • CM coding guidelines, ensuring that the code accurately reflects the clinical documentation
  • Include any relevant external cause codes if applicable

Exclusion Criteria

Do NOT use S21.402 When
  • Exclude codes for closed wounds or superficial injuries

Related ICD-10 Codes

Related CPT Codes

32000CPT Code

Thoracentesis

Clinical Scenario

Used to drain fluid from the thoracic cavity in cases of hemothorax.

Documentation Requirements

Document indication for procedure, fluid characteristics, and patient response.

Specialty Considerations

Ensure that the procedure is linked to the diagnosis of thoracic injury.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of injuries, improving the accuracy of data collection and reimbursement processes. S21.402 provides a clear framework for documenting complex thoracic injuries.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of injuries, improving the accuracy of data collection and reimbursement processes. S21.402 provides a clear framework for documenting complex thoracic injuries.

Reimbursement & Billing Impact

reimbursement processes. S21.402 provides a clear framework for documenting complex thoracic injuries.

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 importance of specifying the type of wound?

Specifying the type of wound is crucial for accurate coding, treatment planning, and understanding the potential complications associated with the injury.