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

Cite This Page

Reference S21 with the canonical source and edition:

S21 — Open wound of thorax. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/S21

Canonical URL: https://icd10codingpro.com/codes/S21

Related Codes

More Specific Codes

S21.0 Open wound of breast S21.1 Open wound of front wall of thorax without penetration into thoracic cavity S21.2 Open wound of back wall of thorax without penetration into thoracic cavity S21.3 Open wound of front wall of thorax with penetration into thoracic cavity S21.4 Open wound of back wall of thorax with penetration into thoracic cavity S21.9 Open wound of unspecified part of thorax

All Codes in S21

Every most-specific code under S21 Open wound of thorax (96 codes):

Show the complete S21 code list
S21.001 Unspecified open wound of right breast S21.002 Unspecified open wound of left breast S21.009 Unspecified open wound of unspecified breast S21.011 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 S21.021 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 S21.031 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 S21.041 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 S21.051 Open bite of right breast S21.052 Open bite of left breast S21.059 Open bite of unspecified breast 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 S21.111 Laceration without foreign body of right front wall of thorax without penetration into thoracic cavity S21.112 Laceration without foreign body of left front wall of thorax without penetration into thoracic cavity S21.119 Laceration without foreign body of unspecified front wall of thorax without penetration into thoracic cavity S21.121 Laceration with foreign body of right front wall of thorax without penetration into thoracic cavity S21.122 Laceration with foreign body of left front wall of thorax without penetration into thoracic cavity S21.129 Laceration with foreign body of unspecified front wall of thorax without penetration into thoracic cavity S21.131 Puncture wound without foreign body of right front wall of thorax without penetration into thoracic cavity S21.132 Puncture wound without foreign body of left front wall of thorax without penetration into thoracic cavity S21.139 Puncture wound without foreign body of unspecified front wall of thorax without penetration into thoracic cavity S21.141 Puncture wound with foreign body of right front wall of thorax without penetration into thoracic cavity S21.142 Puncture wound with foreign body of left front wall of thorax without penetration into thoracic cavity S21.149 Puncture wound with foreign body of unspecified front wall of thorax without penetration into thoracic cavity S21.151 Open bite of right front wall of thorax without penetration into thoracic cavity S21.152 Open bite of left front wall of thorax without penetration into thoracic cavity S21.159 Open bite of unspecified front wall of thorax without penetration into thoracic cavity S21.201 Unspecified open wound of right back wall of thorax without penetration into thoracic cavity S21.202 Unspecified open wound of left back wall of thorax without penetration into thoracic cavity S21.209 Unspecified open wound of unspecified back wall of thorax without penetration into thoracic cavity S21.211 Laceration without foreign body of right back wall of thorax without penetration into thoracic cavity S21.212 Laceration without foreign body of left back wall of thorax without penetration into thoracic cavity S21.219 Laceration without foreign body of unspecified back wall of thorax without penetration into thoracic cavity S21.221 Laceration with foreign body of right back wall of thorax without penetration into thoracic cavity S21.222 Laceration with foreign body of left back wall of thorax without penetration into thoracic cavity S21.229 Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity S21.231 Puncture wound without foreign body of right back wall of thorax without penetration into thoracic cavity S21.232 Puncture wound without foreign body of left back wall of thorax without penetration into thoracic cavity S21.239 Puncture wound without foreign body of unspecified back wall of thorax without penetration into thoracic cavity S21.241 Puncture wound with foreign body of right back wall of thorax without penetration into thoracic cavity S21.242 Puncture wound with foreign body of left back wall of thorax without penetration into thoracic cavity S21.249 Puncture wound with foreign body of unspecified back wall of thorax without penetration into thoracic cavity S21.251 Open bite of right back wall of thorax without penetration into thoracic cavity S21.252 Open bite of left back wall of thorax without penetration into thoracic cavity S21.259 Open bite of unspecified back wall of thorax without penetration into thoracic cavity S21.301 Unspecified open wound of right front wall of thorax with penetration into thoracic cavity S21.302 Unspecified open wound of left front wall of thorax with penetration into thoracic cavity S21.309 Unspecified open wound of unspecified front wall of thorax with penetration into thoracic cavity S21.311 Laceration without foreign body of right front wall of thorax with penetration into thoracic cavity S21.312 Laceration without foreign body of left front wall of thorax with penetration into thoracic cavity S21.319 Laceration without foreign body of unspecified front wall of thorax with penetration into thoracic cavity S21.321 Laceration with foreign body of right front wall of thorax with penetration into thoracic cavity S21.322 Laceration with foreign body of left front wall of thorax with penetration into thoracic cavity S21.329 Laceration with foreign body of unspecified front wall of thorax with penetration into thoracic cavity S21.331 Puncture wound without foreign body of right front wall of thorax with penetration into thoracic cavity S21.332 Puncture wound without foreign body of left front wall of thorax with penetration into thoracic cavity S21.339 Puncture wound without foreign body of unspecified front wall of thorax with penetration into thoracic cavity S21.341 Puncture wound with foreign body of right front wall of thorax with penetration into thoracic cavity S21.342 Puncture wound with foreign body of left front wall of thorax with penetration into thoracic cavity S21.349 Puncture wound with foreign body of unspecified front wall of thorax with penetration into thoracic cavity S21.351 Open bite of right front wall of thorax with penetration into thoracic cavity S21.352 Open bite of left front wall of thorax with penetration into thoracic cavity S21.359 Open bite of unspecified front wall of thorax with penetration into thoracic cavity S21.401 Unspecified open wound of right back wall of thorax with penetration into thoracic cavity S21.402 Unspecified open wound of left back wall of thorax with penetration into thoracic cavity S21.409 Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity S21.411 Laceration without foreign body of right back wall of thorax with penetration into thoracic cavity S21.412 Laceration without foreign body of left back wall of thorax with penetration into thoracic cavity S21.419 Laceration without foreign body of unspecified back wall of thorax with penetration into thoracic cavity S21.421 Laceration with foreign body of right back wall of thorax with penetration into thoracic cavity S21.422 Laceration with foreign body of left back wall of thorax with penetration into thoracic cavity S21.429 Laceration with foreign body of unspecified back wall of thorax with penetration into thoracic cavity S21.431 Puncture wound without foreign body of right back wall of thorax with penetration into thoracic cavity S21.432 Puncture wound without foreign body of left back wall of thorax with penetration into thoracic cavity S21.439 Puncture wound without foreign body of unspecified back wall of thorax with penetration into thoracic cavity S21.441 Puncture wound with foreign body of right back wall of thorax with penetration into thoracic cavity S21.442 Puncture wound with foreign body of left back wall of thorax with penetration into thoracic cavity S21.449 Puncture wound with foreign body of unspecified back wall of thorax with penetration into thoracic cavity S21.451 Open bite of right back wall of thorax with penetration into thoracic cavity S21.452 Open bite of left back wall of thorax with penetration into thoracic cavity S21.459 Open bite of unspecified back wall of thorax with penetration into thoracic cavity S21.90 Unspecified open wound of unspecified part of thorax S21.91 Laceration without foreign body of unspecified part of thorax S21.92 Laceration with foreign body of unspecified part of thorax S21.93 Puncture wound without foreign body of unspecified part of thorax S21.94 Puncture wound with foreign body of unspecified part of thorax S21.95 Open bite of unspecified part of thorax
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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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