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v1.0.0
ICD-10 Guide
ICD-10 CodesS21.21

S21.21

Billable

Laceration without foreign body of back wall of thorax without penetration into thoracic cavity

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

Code Description

ICD-10 S21.21 is a billable code used to indicate a diagnosis of laceration without foreign body of back wall of thorax without penetration into thoracic cavity.

Key Diagnostic Point:

S21.21 refers to a specific type of thoracic injury characterized by a laceration on the back wall of the thorax that does not involve any foreign body and does not penetrate the thoracic cavity. This type of injury can occur due to blunt or penetrating trauma, such as falls, motor vehicle accidents, or sports injuries. Clinically, it is important to assess for associated injuries, including rib fractures, pneumothorax, hemothorax, or cardiac injuries, which may complicate the clinical picture. The absence of penetration into the thoracic cavity is crucial, as it differentiates this injury from more severe thoracic trauma that could lead to significant complications. Management typically involves wound care, monitoring for complications, and possibly surgical intervention if associated injuries are present. Accurate coding of this condition is essential for proper treatment planning and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between types of thoracic injuries
  • Identifying associated injuries such as rib fractures or pneumothorax
  • Understanding the implications of non-penetrating versus penetrating injuries
  • Documentation requirements for trauma cases

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury
  • Failure to document associated injuries
  • Misclassification of penetrating versus non-penetrating injuries
  • Inconsistent coding practices among providers

Specialty Focus

Medical Specialties

Emergency Medicine

Documentation Requirements

Detailed documentation of the mechanism of injury, physical examination findings, and any imaging studies performed.

Common Clinical Scenarios

Patients presenting with trauma from falls, motor vehicle accidents, or sports injuries with lacerations to the thorax.

Billing Considerations

Ensure that all associated injuries are documented to avoid undercoding or misclassification.

Trauma Surgery

Documentation Requirements

Comprehensive surgical notes detailing the extent of the laceration, any surgical interventions performed, and post-operative care.

Common Clinical Scenarios

Patients requiring surgical intervention for thoracic injuries, including lacerations and associated rib fractures.

Billing Considerations

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

Coding Guidelines

Inclusion Criteria

Use S21.21 When
  • According to ICD
  • 10 guidelines, S21
  • 21 should be used when documenting a laceration of the back wall of the thorax without foreign body involvement and 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 S21.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

12001CPT Code

Simple repair of superficial wounds

Clinical Scenario

Used for laceration repair in the emergency department.

Documentation Requirements

Document the size and location of the laceration, as well as the method of repair.

Specialty Considerations

Emergency medicine providers should ensure that all relevant details are captured in the medical record.

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 accuracy of data collection and reimbursement processes. S21.21 provides a clear distinction between types of lacerations, which aids in clinical management and research.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of thoracic injuries, improving the accuracy of data collection and reimbursement processes. S21.21 provides a clear distinction between types of lacerations, which aids in clinical management and research.

Reimbursement & Billing Impact

reimbursement processes. S21.21 provides a clear distinction between types of lacerations, which aids in clinical management and research.

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 difference between S21.21 and S21.22?

S21.21 is used for lacerations without foreign bodies, while S21.22 is for lacerations that involve a foreign body.