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S21

Non-billable

Open wound of thorax

S21 is the ICD-10-CM code for Open wound of thorax. It is a non-billable category code — use a more specific child code such as S21.0 for billing.

Status
Header (non-billable)
Chapter
S00-T88
Subcodes
6
Edition
FY2026

S00-T88 Injury, poisoning and certain other consequences of external causes

Excludes1 — not coded here

  • •traumatic amputation (partial) of thorax (S28.1)

Notes

  • •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

Frequently asked questions

What is ICD-10 code S21?
S21 is the ICD-10-CM code for "Open wound of thorax". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is S21 a billable code?
No — S21 is a non-billable header code. Use a more specific child code (such as S21.0) for billing.
What are the subcodes of S21?
S21 has 6 more specific child codes, including S21.0, S21.1, S21.2.
What is excluded from S21?
Excludes1 (not coded here): traumatic amputation (partial) of thorax (S28.1).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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