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ICD-10 Guide
ICD-10 CodesS21.431

S21.431

Billable

Puncture wound without foreign body of right back wall of thorax with penetration into thoracic cavity

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

Code Description

ICD-10 S21.431 is a billable code used to indicate a diagnosis of puncture wound without foreign body of right back wall of thorax with penetration into thoracic cavity.

Key Diagnostic Point:

A puncture wound of the thorax, specifically the right back wall, indicates a breach in the thoracic wall that has penetrated into the thoracic cavity. This type of injury can occur due to various mechanisms, including trauma from sharp objects, gunshot wounds, or stab injuries. The absence of a foreign body suggests that the wound is not complicated by retained debris, which can simplify management. However, penetration into the thoracic cavity raises concerns for serious complications such as pneumothorax, hemothorax, or injury to thoracic organs including the lungs, heart, and major blood vessels. Clinical evaluation typically involves imaging studies like chest X-rays or CT scans to assess for air or fluid in the thoracic cavity and to evaluate for rib fractures or other associated injuries. Management may require surgical intervention, particularly if there is significant bleeding or organ damage. The prognosis depends on the extent of the injury and the timeliness of treatment.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Need for accurate documentation of the mechanism of injury
  • Assessment of associated injuries (e.g., pneumothorax, hemothorax)
  • Potential for surgical intervention and its documentation
  • Differentiation from similar codes (e.g., open wounds, rib fractures)

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury
  • Failure to document associated injuries or complications
  • Misclassification of the type of wound (e.g., puncture vs. laceration)
  • Lack of imaging results to support the diagnosis

Specialty Focus

Medical Specialties

Emergency Medicine

Documentation Requirements

Detailed account of the injury mechanism, vital signs, and initial management steps.

Common Clinical Scenarios

Patients presenting with stab wounds or gunshot wounds to the thorax.

Billing Considerations

Timely documentation is crucial for trauma cases; ensure all imaging and interventions are recorded.

Thoracic Surgery

Documentation Requirements

Operative reports detailing the surgical approach, findings, and any repairs made.

Common Clinical Scenarios

Surgical intervention for hemothorax or lung injury following a puncture wound.

Billing Considerations

Accurate coding of surgical procedures and any complications must be documented.

Coding Guidelines

Inclusion Criteria

Use S21.431 When
  • Follow official ICD
  • CM coding guidelines, ensuring that the code reflects the specific nature of the injury and any associated complications
  • Include documentation of the mechanism of injury and any imaging studies performed

Exclusion Criteria

Do NOT use S21.431 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

32000CPT Code

Thoracentesis

Clinical Scenario

Used to drain fluid or air from the thoracic cavity following a puncture wound.

Documentation Requirements

Document the indication for the procedure, the amount of fluid removed, and any complications.

Specialty Considerations

Ensure that the procedure is linked to the diagnosis of puncture wound.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of injuries, including puncture wounds, which enhances the ability to track and manage trauma cases effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of injuries, including puncture wounds, which enhances the ability to track and manage trauma cases effectively.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of injuries, including puncture wounds, which enhances the ability to track and manage trauma cases effectively.

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 a puncture wound and a laceration?

A puncture wound is a deep wound caused by a sharp object that penetrates the skin and underlying tissues, while a laceration is a tear or cut in the skin that may be jagged or irregular.