ICD-10-CM S21 is the diagnosis code for Open wound of thorax. This code falls under the section "Injuries to the thorax" within Chapter 19 — Injury, poisoning and certain other consequences of external causes (S00-T88). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as S21. They are mutually exclusive:
Understanding where S21 sits in the ICD-10-CM classification helps ensure proper coding:
No, S21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
S21 is the ICD-10-CM diagnosis code for "Open wound of thorax". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
S21 is located in Section S20-S29 — "Injuries to the thorax" within Chapter 19 of the ICD-10-CM Tabular List.
S21 has 6 sub-code(s) that provide more specific detail: S21.0, S21.1, S21.2, S21.3, S21.4 and more.
Use S21 when the patients documented diagnosis matches "Open wound of thorax" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Open wound of thorax is S21.
No, S21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
S21 is in Chapter 19 of the ICD-10-CM Tabular List.
Type 1 Excludes for S21 include: traumatic amputation (partial) of thorax (S28.1).
Yes, S21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.