S21.9
⚠ Non-billable
Open wound of unspecified part of thorax
ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes
Code
S21.9
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code S21.9?
ICD-10-CM code S21.9 represents Open wound of unspecified part of thorax. It is a non-billable header code requiring a more specific subcategory in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is S21.9 billable?
No. S21.9 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is S21.9 in?
S21.9 belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.
Related codes in the S21 category
S21
Open wound of thorax
Non-billable
S21.0
Open wound of breast
Non-billable
S21.1
Open wound of front wall of thorax without penetration into thoracic cavity
Non-billable
S21.2
Open wound of back wall of thorax without penetration into thoracic cavity
Non-billable
S21.3
Open wound of front wall of thorax with penetration into thoracic cavity
Non-billable
S21.4
Open wound of back wall of thorax with penetration into thoracic cavity
Non-billable
S21.00
Unspecified open wound of breast
Non-billable
S21.01
Laceration without foreign body of breast
Non-billable
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