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T20.56XD vs T26

T20.56XD (Corrosion of first degree of forehead and cheek, subsequent encounter) compared with T26 (Burn and corrosion confined to eye and adnexa), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because T20.56XD lists T26 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.T20.56XD is “Corrosion of first degree of forehead and cheek, subsequent encounter”; T26 is “Burn and corrosion confined to eye and adnexa”. T26 is a non-billable header; T20.56XD is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.T20.56XD lists T26 under Excludes2: “burn and corrosion of eye and adnexa (T26.-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

Yes.T20.56XD’s tabular entry: “burn and corrosion of eye and adnexa (T26.-)”. The note covers T26.

Official ruleGuide: Excludes1 vs Excludes2

Is one a parent or header code?

One is a header.T26 is a non-billable header, but T20.56XD is not one of its subdivisions.

Registry fact

Nothing found in 3 other checks; 1 check does not apply
Is there an Excludes1 relationship?

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

Official rule

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

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

T20.56XD
Corrosion of first degree of forehead and cheek, subsequent encounter
↔
T26
Burn and corrosion confined to eye and adnexa

What we found

Yes, when both are documented.T20.56XD carries an Excludes2 note covering T26: “burn and corrosion of eye and adnexa (T26.-)”

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 FY2027

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

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
T20.56XD

Corrosion of first degree of forehead and cheek, subsequent encounter

T26

Burn and corrosion confined to eye and adnexa

StatusDiffers
T20.56XD
Billable
T26
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: T26.00XA, T26.00XD, T26.00XS, T26.01XA, T26.01XD

Excludes2Differs
T20.56XD
  • burn and corrosion of ear drum (T28.41, T28.91)
  • burn and corrosion of eye and adnexa (T26.-)
  • burn and corrosion of mouth and pharynx (T28.0)
T26

None at this code

Code firstDiffers
T20.56XD
  • (T51-T65) to identify chemical and intent
T26

None at this code

Use additional codeDiffers
T20.56XD
  • external cause code to identify place (Y92)
  • code from category T31 or T32 to identify extent of body surface involved
T26

None at this code

CategoryDiffers
T20.56XD

T20 Burn and corrosion of head, face, and neck

T26

Is itself a category

ChapterSame for both

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesDiffers
T20.56XD
  • burns and corrosions of first degree [erythema]
  • burns and corrosions of second degree [blisters][epidermal loss]
  • burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]
T26

None at this code

7th characterDiffers
T20.56XD
  • The appropriate 7th character is to be added to each code from category T20
T26
  • The appropriate 7th character is to be added to each code from category T26

No Excludes1 and Code also note at either code.

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. In a row that differs, each code’s own notes are listed under it, and the notes every code shares are listed once beneath them.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources