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S20.20 vs S20.96XA

S20.20 (Contusion of thorax, unspecified) compared with S20.96XA (Insect bite (nonvenomous) of unspecified parts of thorax, initial encounter), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

S20.96XA
Insect bite (nonvenomous) of unspecified parts of thorax, initial encounter
↔
S20.20
Contusion of thorax, unspecified

Not coded here — these two are mutually exclusive.

“contusion of thorax NOS (S20.20)”

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. S20.96XA carries an Excludes1 note covering S20.20: “contusion of thorax NOS (S20.20)”

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

S20.20Contusion of thorax, unspecifiedS20.96XAInsect bite (nonvenomous) of unspecified parts of thorax, initial encounter
Billing statusNon-billable headerBillable
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)
DefinitionContusion of thorax, unspecified is a non-billable ICD-10-CM category code (S20.20).Insect bite (nonvenomous) of unspecified parts of thorax, initial encounter is a billable ICD-10-CM diagnosis code (S20.96A).
7th characterThe appropriate 7th character is to be added to each code from category S20The appropriate 7th character is to be added to each code from category S20
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