S21 Open wound of thorax

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Open wound of thorax is S21 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
S20-S29: Injuries to the thorax (S20-S29)
Category S21
133 codes (96 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with S21.
  • traumatic amputation (partial) of thorax (S28.1)
Code Also
  • any associated injury, such as:
  • injury of heart (S26.-)
  • injury of intrathoracic organs (S27.-)
  • rib fracture (S22.3-, S22.4-)
  • spinal cord injury (S24.0-, S24.1-)
  • traumatic hemopneumothorax (S27.3)
  • traumatic hemothorax (S27.1)
  • traumatic pneumothorax (S27.0)
  • wound infection

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.2
Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.3

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

S21.0 Open wound of breast S21.00 Unspecified open wound of breast S21.001 Unspecified open wound of right breast S21.002 Unspecified open wound of left breast S21.009 Unspecified open wound of unspecified breast S21.01 Laceration without foreign body of breast S21.011 Laceration without foreign body of right breast S21.012 Laceration without foreign body of left breast S21.019 Laceration without foreign body of unspecified breast S21.02 Laceration with foreign body of breast S21.021 Laceration with foreign body of right breast S21.022 Laceration with foreign body of left breast S21.029 Laceration with foreign body of unspecified breast S21.03 Puncture wound without foreign body of breast S21.031 Puncture wound without foreign body of right breast S21.032 Puncture wound without foreign body of left breast S21.039 Puncture wound without foreign body of unspecified breast S21.04 Puncture wound with foreign body of breast S21.041 Puncture wound with foreign body of right breast S21.042 Puncture wound with foreign body of left breast S21.049 Puncture wound with foreign body of unspecified breast S21.05 Open bite of breast S21.051 Open bite of right breast S21.052 Open bite of left breast S21.059 Open bite of unspecified breast S21.1 Open wound of front wall of thorax without penetration into thoracic cavity S21.10 Unspecified open wound of front wall of thorax without penetration into thoracic cavity S21.101 Unspecified open wound of right front wall of thorax without penetration into thoracic cavity S21.102 Unspecified open wound of left front wall of thorax without penetration into thoracic cavity S21.109 Unspecified open wound of unspecified front wall of thorax without penetration into thoracic cavity

Related Codes in S21

S21.0 Open wound of breast S21.00 Unspecified open wound of breast S21.001 Unspecified open wound of right breast S21.002 Unspecified open wound of left breast S21.009 Unspecified open wound of unspecified breast S21.01 Laceration without foreign body of breast S21.011 Laceration without foreign body of right breast S21.012 Laceration without foreign body of left breast S21.019 Laceration without foreign body of unspecified breast S21.02 Laceration with foreign body of breast S21.021 Laceration with foreign body of right breast S21.022 Laceration with foreign body of left breast S21.029 Laceration with foreign body of unspecified breast S21.03 Puncture wound without foreign body of breast S21.031 Puncture wound without foreign body of right breast S21.032 Puncture wound without foreign body of left breast S21.039 Puncture wound without foreign body of unspecified breast S21.04 Puncture wound with foreign body of breast S21.041 Puncture wound with foreign body of right breast S21.042 Puncture wound with foreign body of left breast
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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