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W13.3XXD vs X00

W13.3XXD (Fall through floor, subsequent encounter) compared with X00 (Exposure to uncontrolled fire in building or structure), 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 W13.3XXD lists X00 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.W13.3XXD is “Fall through floor, subsequent encounter”; X00 is “Exposure to uncontrolled fire in building or structure”. X00 is a non-billable header; W13.3XXD is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.W13.3XXD lists X00 under Excludes2: “fall (in) (from) burning building (X00.-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

Yes.W13.3XXD’s tabular entry: “fall (in) (from) burning building (X00.-)”. The note covers X00.

Official ruleGuide: Excludes1 vs Excludes2

Is one a parent or header code?

One is a header.X00 is a non-billable header, but W13.3XXD 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. W13.3XXD carries 5 Excludes1 notes and X00 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

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

W13.3XXD
Fall through floor, subsequent encounter
↔
X00
Exposure to uncontrolled fire in building or structure

What we found

Yes, when both are documented.W13.3XXD carries an Excludes2 note covering X00: “fall (in) (from) burning building (X00.-)”

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
W13.3XXD

Fall through floor, subsequent encounter

X00

Exposure to uncontrolled fire in building or structure

StatusDiffers
W13.3XXD
Billable
X00
Non-billable header

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

Report instead: X00.0XXA, X00.0XXD, X00.0XXS, X00.1XXA, X00.1XXD

Excludes1Differs
W13.3XXD
  • assault involving a fall (Y01-Y02)
  • fall from animal (V80.-)
  • fall (in) (from) machinery (in operation) (W28-W31)
  • fall (in) (from) transport vehicle (V01-V99)
  • intentional self-harm involving a fall (X80-X81)
X00
  • arson (X97)
Excludes2Differs
W13.3XXD
  • at risk for fall (history of fall) Z91.81
  • fall (in) (from) burning building (X00.-)
  • fall into fire (X00-X04, X08)
X00
  • Exposure to ignition or melting of nightwear (X05)
  • Exposure to ignition or melting of other clothing and apparel (X06.-)
  • Exposure to other specified smoke, fire and flames (X08.-)
  • explosions (W35-W40)
  • lightning (T75.0-)
  • transport accident (V01-V99)
Code firstDiffers
W13.3XXD

None at this code

X00
  • any associated cataclysm
CategoryDiffers
W13.3XXD

W13 Fall from, out of or through building or structure

X00

Is itself a category

ChapterSame for both

V00-Y99 — External Causes of Morbidity (V00-Y99)

IncludesDiffers
W13.3XXD

None at this code

X00
  • conflagration in building or structure
7th characterDiffers
W13.3XXD
  • The appropriate 7th character is to be added to each code from category W13
X00
  • The appropriate 7th character is to be added to each code from category X00

No Use additional code 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