S21.209A
✓ BillableUnspecified open wound of unspecified back wall of thorax without penetration into thoracic cavity, initial encounter
Injury, poisoning and certain other consequences of external causes (S00-T88)
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • traumatic amputation (partial) of thorax (S28.1)
Clinical Description
ICD-10-CM code S21.209A represents unspecified open wound of unspecified back wall of thorax without penetration into thoracic cavity, initial encounter. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 8-character code at the 7th level of specificity. This is the most specific code available in this subcategory. Coders should note that S21.209A has 1 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code S21.209A?
ICD-10-CM code S21.209A is "Unspecified open wound of unspecified back wall of thorax without penetration into thoracic cavity, initial encounter". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).
Is S21.209A a billable ICD-10 code?
Yes, S21.209A is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with S21.209A?
S21.209A has 1 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Related Codes in S21.209
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)