S21 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Open wound of thorax.
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Traumatic amputation (partial) of thorax (S28.1)
The appropriate 7th character is to be added to each code from category S21
A: initial encounter
D: subsequent encounter
S: sequela
Open wound of breast
Open wound of front wall of thorax without penetration into thoracic cavity
Open wound of back wall of thorax without penetration into thoracic cavity
Open wound of front wall of thorax with penetration into thoracic cavity
Open wound of back wall of thorax with penetration into thoracic cavity
Open wound of unspecified part of thorax
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