U.S. ICD-10-CM · FY 2027

S21 ICD-10-CM Code: Open wound of thorax

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

S21

Open wound of thorax

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where S21 sits

  1. 1

    Chapter 19

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

  2. 2

    Section

    Injuries to the thorax (S20-S29)

  3. 3

    Category S21

    Open wound of thorax

  4. 4

    Code S21

    Open wound of thorax

More specific choices

Codes under S21

S21 is a non-billable category. Choose the child code that best matches the documented diagnosis.

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

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for S21.

Code first

No “code first” instruction is listed for S21.

Use additional code

No “use additional code” instruction is listed for S21.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for S21.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code S21 mean?

S21 is the FY 2027 U.S. ICD-10-CM code for “Open wound of thorax.”

Is S21 a billable or specific ICD-10-CM code?

No. S21 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is S21 located in ICD-10-CM?

S21 is listed in Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88), within Injuries to the thorax (S20-S29) (S20–S29), under category S21, Open wound of thorax.

What coding notes are listed for S21?

No inclusion terms are listed for S21 in this reference record. No code-first instruction is listed. Excludes1 notes: traumatic amputation (partial) of thorax (S28.1). No Excludes2 note is listed.

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