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ICD-10 Guide
ICD-10 CodesS21.202

S21.202

Billable

Unspecified open wound of left back wall of thorax without penetration into thoracic cavity

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

Code Description

ICD-10 S21.202 is a billable code used to indicate a diagnosis of unspecified open wound of left back wall of thorax without penetration into thoracic cavity.

Key Diagnostic Point:

An unspecified open wound of the left back wall of the thorax refers to a traumatic injury that results in a break in the skin and underlying tissues on the left side of the thoracic wall, specifically the posterior aspect. This type of injury may occur due to blunt or penetrating trauma, such as falls, motor vehicle accidents, or assaults. The absence of penetration into the thoracic cavity indicates that vital structures such as the lungs, heart, and major blood vessels remain intact, reducing the risk of complications like pneumothorax or hemothorax. However, the injury can still lead to significant pain, potential rib fractures, and soft tissue damage. Clinical evaluation often includes physical examination and imaging studies to assess for associated injuries. Treatment typically involves wound care, pain management, and monitoring for any delayed complications. The coding of this injury requires careful documentation of the mechanism of injury, the extent of the wound, and any associated injuries to ensure accurate coding and billing.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

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

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury
  • Failure to note associated injuries
  • Misclassification of wound type
  • Inconsistent coding practices among providers

Specialty Focus

Medical Specialties

Emergency Medicine

Documentation Requirements

Detailed account of the mechanism of injury, physical examination findings, and any imaging results.

Common Clinical Scenarios

Patients presenting with trauma from falls or accidents with open wounds.

Billing Considerations

Ensure thorough documentation of any associated injuries, such as rib fractures or pneumothorax.

Trauma Surgery

Documentation Requirements

Comprehensive surgical notes detailing the injury, surgical interventions, and post-operative care.

Common Clinical Scenarios

Surgical intervention for complex thoracic injuries or wound debridement.

Billing Considerations

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

Coding Guidelines

Inclusion Criteria

Use S21.202 When
  • Follow ICD
  • CM guidelines for coding injuries, ensuring specificity in documentation
  • Include details about the mechanism of injury and any associated conditions

Exclusion Criteria

Do NOT use S21.202 When
  • Exclude codes for penetrating wounds or injuries with complications

Related ICD-10 Codes

Related CPT Codes

12001CPT Code

Simple repair of superficial wounds

Clinical Scenario

Used for wound care in outpatient settings.

Documentation Requirements

Document the size, location, and nature of the wound.

Specialty Considerations

Ensure that the repair is documented as superficial to align with the CPT code.

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. S21.202 provides a clear distinction for open wounds without complications.

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. S21.202 provides a clear distinction for open wounds without complications.

Reimbursement & Billing Impact

reimbursement processes. S21.202 provides a clear distinction for open wounds without complications.

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 specifying 'unspecified' in this code?

The term 'unspecified' indicates that the documentation does not provide enough detail to classify the wound further. It is essential for coders to seek additional information to ensure accurate coding and avoid potential audit issues.