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S21.95 vs S28.1

S21.95 (Open bite of unspecified part of thorax) compared with S28.1 (Traumatic amputation (partial) of part of thorax, except breast), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

S21.95
Open bite of unspecified part of thorax
↔
S28.1
Traumatic amputation (partial) of part of thorax, except breast

Not coded here — these two are mutually exclusive.

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

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. S21.95 carries an Excludes1 note covering S28.1: “traumatic amputation (partial) of thorax (S28.1)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

S21.95Open bite of unspecified part of thoraxS28.1Traumatic amputation (partial) of part of thorax, except breast
Billing statusNon-billable headerNon-billable header
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionOpen bite of unspecified part of thorax is a non-billable ICD-10-CM category code (S21.95).Traumatic amputation (partial) of part of thorax, except breast is a non-billable ICD-10-CM category code (S28.1).
7th characterThe appropriate 7th character is to be added to each code from category S21The appropriate 7th character is to be added to each code from category S28
Includes
injuries of breast
injuries of chest (wall)
injuries of interscapular area
injuries of breast
injuries of chest (wall)
injuries of interscapular area
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources