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S21 ⚠ Non-billable

Open wound of thorax

ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes

Code
S21
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Excludes1 — never code together
  • 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
7th character
  • The appropriate 7th character is to be added to each code from category S21

Frequently asked questions

What is ICD-10 code S21?
ICD-10-CM code S21 represents Open wound of thorax. It is a non-billable header code requiring a more specific subcategory in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is S21 billable?
No. S21 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is S21 in?
S21 belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.

Related codes in the S21 category

S21.0 Open wound of breast Non-billable S21.00 Unspecified open wound of breast Non-billable S21.01 Laceration without foreign body of breast Non-billable S21.02 Laceration with foreign body of breast Non-billable S21.03 Puncture wound without foreign body of breast Non-billable S21.001 Unspecified open wound of right breast Non-billable S21.002 Unspecified open wound of left breast Non-billable S21.009 Unspecified open wound of unspecified breast Non-billable

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