S21.9

S21.9: Open wound of unspecified part of thorax

Non-billable headerICD-10-CM

S21.9 is a non-billable header ICD-10-CM code for open wound of unspecified part of thorax. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category S21

A: initial encounter
D: subsequent encounter
S: sequela

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Open wound of thoracic wall NOS

Excludes1 inherited from the categories above S21.9

A category’s note binds every code beneath it.

Written on S21: Open wound of thorax

traumatic amputation (partial) of thorax (S28.1)

Other codes that can never be billed with S21.9

Their own Excludes1 notes name this code, so the conflict is not listed above.

S20.97Other superficial bite of unspecified parts of thorax
S20.97XAOther superficial bite of unspecified parts of thorax, initial encounter
S20.97XDOther superficial bite of unspecified parts of thorax, subsequent encounter
S20.97XSOther superficial bite of unspecified parts of thorax, sequela

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead S21.9

6 child codes. Green means billable.