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.
Official description
S21Open wound of thorax
ICD-10-CM diagnosis code · United States clinical modification
Where S21 sits
- 1
Chapter 19
Injury, poisoning and certain other consequences of external causes (S00-T88)
- 2
Section
Injuries to the thorax (S20-S29)
- 3
Category S21
Open wound of thorax
- 4
Code S21
Open wound of thorax
Codes under S21
S21 is a non-billable category. Choose the child code that best matches the documented diagnosis.
S21.0Open wound of breastS21.1Open wound of front wall of thorax without penetration into thoracic cavityS21.2Open wound of back wall of thorax without penetration into thoracic cavityS21.3Open wound of front wall of thorax with penetration into thoracic cavityS21.4Open wound of back wall of thorax with penetration into thoracic cavityS21.9Open wound of unspecified part of thoraxNotes 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.
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.
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.