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ICD-10 Guide
ICD-10 CodesS21.109

S21.109

Billable

Unspecified open wound of unspecified front wall of thorax without penetration into thoracic cavity

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

Code Description

ICD-10 S21.109 is a billable code used to indicate a diagnosis of unspecified open wound of unspecified front wall of thorax without penetration into thoracic cavity.

Key Diagnostic Point:

An unspecified open wound of the front wall of the thorax refers to a traumatic injury that results in a break in the skin and underlying tissues of the chest area, but does not extend into the thoracic cavity. This type of injury can occur due to various mechanisms, including blunt trauma, penetrating injuries, or accidents. The front wall of the thorax includes the sternum and ribs, which can be affected by such wounds. While the wound itself may not penetrate the thoracic cavity, it can still lead to complications such as rib fractures, pneumothorax, or hemothorax. Rib fractures can occur due to the force of the injury, potentially leading to pain, difficulty breathing, and other respiratory complications. Pneumothorax, the accumulation of air in the pleural space, can arise from rib fractures that puncture the pleura, while hemothorax involves bleeding into the pleural cavity. Cardiac injuries may also be a concern in severe cases, necessitating careful evaluation. Surgical interventions may be required to manage complications or repair associated injuries, emphasizing the importance of thorough documentation and assessment in these cases.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in documentation of wound specifics
  • Potential for associated injuries (e.g., rib fractures, pneumothorax)
  • Need for clear differentiation from other thoracic injuries
  • Variability in treatment approaches and surgical interventions

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury
  • Failure to document associated injuries or complications
  • Misclassification of the wound type or location
  • Inconsistent coding practices across providers

Specialty Focus

Medical Specialties

Emergency Medicine

Documentation Requirements

Detailed account of the mechanism of injury, assessment of vital signs, and any immediate interventions performed.

Common Clinical Scenarios

Patients presenting with chest trauma from motor vehicle accidents or falls.

Billing Considerations

Ensure documentation includes any imaging studies performed and findings related to rib fractures or pneumothorax.

Thoracic Surgery

Documentation Requirements

Comprehensive surgical notes detailing the procedure performed, indications for surgery, and post-operative care.

Common Clinical Scenarios

Patients requiring surgical intervention for rib fractures or complications from chest trauma.

Billing Considerations

Accurate coding of any surgical procedures performed in conjunction with the open wound.

Coding Guidelines

Inclusion Criteria

Use S21.109 When
  • According to ICD
  • 10 coding guidelines, this code should be used when the documentation specifies an open wound of the thorax without penetration into the thoracic cavity
  • Coders must ensure that the documentation supports the diagnosis and that any associated injuries are coded appropriately

Exclusion Criteria

Do NOT use S21.109 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99283CPT Code

Emergency department visit, moderate severity

Clinical Scenario

Used for initial evaluation of a patient with an open thoracic wound.

Documentation Requirements

Document the patient's history, examination findings, and any interventions performed.

Specialty Considerations

Emergency medicine providers should ensure thorough documentation to support the level of service billed.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of thoracic injuries, improving the ability to capture the complexity of chest trauma. This code reflects the need for precise documentation to differentiate between various types of thoracic injuries.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thoracic injuries, improving the ability to capture the complexity of chest trauma. This code reflects the need for precise documentation to differentiate between various types of thoracic injuries.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of thoracic injuries, improving the ability to capture the complexity of chest trauma. This code reflects the need for precise documentation to differentiate between various types of 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 documentation is needed to support the use of S21.109?

Documentation should include a detailed description of the injury, the mechanism of trauma, any imaging results, and assessments of associated injuries or complications.