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S90.2 vs S90.31XS

S90.2 (Contusion of toe with damage to nail) compared with S90.31XS (Contusion of right foot, sequela), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because S90.31XS lists S90.2 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

Title wording and billing status.The titles share “Contusion of”; S90.2 says “toe with damage to nail” where S90.31XS says “right foot, sequela”. S90.2 is a non-billable header; S90.31XS is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.S90.31XS lists S90.2 under Excludes2: “contusion of toes (S90.1-, S90.2-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code.

Official rule

Is there an Excludes2 relationship?

Yes.S90.31XS’s tabular entry: “contusion of toes (S90.1-, S90.2-)”. The note covers S90.2.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

No.Neither is a subdivision of the other, and neither title is the unspecified form; they describe different conditions within category S90.

Registry fact

Is one a parent or header code?

One is a header.S90.2 is a non-billable header, but S90.31XS is not one of its subdivisions.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

S90.31XS
Contusion of right foot, sequela
↔
S90.2
Contusion of toe with damage to nail

What we found

Yes, when both are documented.S90.31XS carries an Excludes2 note covering S90.2: “contusion of toes (S90.1-, S90.2-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

S90.2Contusion of toe with damage to nailS90.31XSContusion of right foot, sequela
Billing statusNon-billable header

Report instead: S90.211A, S90.211D, S90.211S, S90.212A, S90.212D

Billable
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 toe with damage to nail is a non-billable ICD-10-CM category code (S90.2).Contusion of right foot, sequela is a billable ICD-10-CM diagnosis code (S90.31XS).
7th characterThe appropriate 7th character is to be added to each code from category S90The appropriate 7th character is to be added to each code from category S90
Excludes2
burns and corrosions (T20-T32)
fracture of ankle and malleolus (S82.-)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)
contusion of toes (S90.1-, S90.2-)
burns and corrosions (T20-T32)
fracture of ankle and malleolus (S82.-)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources