2027 ICD-10-CM Diagnosis Code X00Exposure to uncontrolled fire in building or structure

ICD-10-CM Codes›V01–Y99›X00-X08›X00

ICD-10-CM X00
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

X00 is a non-billable ICD-10-CM category code for exposure to uncontrolled fire in building or structure, so it cannot be submitted on claims. Use a more specific code from this category instead, such as X00.0XXA, X00.0XXD, X00.0XXS, and X00.1XXA.

Code Identity

ICD-10-CM Code
X00
Billable Status
No — Non-Billable Category
Code Describes
Exposure to uncontrolled fire in building or structure
Short Description
Exposure to uncontrolled fire in building or structure
Same as the full description in the CMS dataset.
Chapter
X00-X08
Exposure to smoke, fire and flames

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionX00-X08Exposure to smoke, fire and flames
CategoryX00Exposure to uncontrolled fire in building or structure
This CodeX00Exposure to uncontrolled fire in building or structure

Specific Coding for Exposure to uncontrolled fire in building or structureOverview

Non-specific codes like X00 require more characters. Use one of these billable codes instead:

  • X00.0 for Exposure to flames in uncontrolled fire in building or structure

  • X00.1 for Exposure to smoke in uncontrolled fire in building or structure

  • X00.2 for Injury due to collapse of burning building or structure in uncontrolled fire

  • X00.3 for Fall from burning building or structure in uncontrolled fire

  • X00.4 for Hit by object from burning building or structure in uncontrolled fire

  • X00.5 for Jump from burning building or structure in uncontrolled fire

  • X00.8 for Other exposure to uncontrolled fire in building or structure

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to X00: its own notes plus those printed at block X00-X08 and Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • conflagration in building or structure

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block X00-X08 Exposure to smoke, fire and flames applies to 120 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On X00 itself
  • 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.-)
From Block X00-X08 Exposure to smoke, fire and flames applies to 120 codes

Code First

The underlying condition named in the note is sequenced before this code.

  • any associated cataclysm

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category X00
Values for category X00 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name X00, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming X00: they are not reported together with it, unless the two conditions are unrelated.

  • W13.9 Fall from, out of or through building, not otherwise specified
    fall or jump from burning building or structure (X00.-)

Excludes2 4

These codes carry an Excludes2 note naming X00: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block W00-W19 Slipping, tripping, stumbling and falls
    fall (in) (from) burning building (X00.-)
  • Block W00-W19 Slipping, tripping, stumbling and falls
    fall into fire (X00-X04, X08)
  • X05 Exposure to ignition or melting of nightwear
    exposure to uncontrolled fire in building or structure (X00.-)
  • X06 Exposure to ignition or melting of other clothing and apparel
    exposure to uncontrolled fire in building or structure (X00.-)

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About X00Overview

What is the ICD-10 code for exposure to uncontrolled fire in building or structure?

X00 is the ICD-10-CM category for exposure to uncontrolled fire in building or structure, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is X00 (Exposure to uncontrolled fire in building or structure) a billable code?

No. This is a category header that groups the codes for exposure to uncontrolled fire in building or structure, and headers cannot be submitted on claims. Claims for exposure to uncontrolled fire in building or structure need a more specific code from this category, such as X00.0XXA, X00.0XXD, and X00.0XXS.

Can X00 be reported with X97?

Not as a rule. The Excludes1 note at block X00-X08, which applies to X00, lists "arson (X97)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is coded first with X00?

The Code First note reads: any associated cataclysm. When one of these applies, it is sequenced before X00.