2027 ICD-10-CM Diagnosis Code X04Exposure to ignition of highly flammable material

ICD-10-CM Codes›V01–Y99›X00-X08›X04

ICD-10-CM X04
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

X04 is a non-billable ICD-10-CM category code for exposure to ignition of highly flammable material, so it cannot be submitted on claims. Use a more specific code from this category instead, such as X04.XXXA, X04.XXXD, and X04.XXXS.

Code Identity

ICD-10-CM Code
X04
Billable Status
No — Non-Billable Category
Code Describes
Exposure to ignition of highly flammable material
Short Description
Exposure to ignition of highly flammable material
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
CategoryX04Exposure to ignition of highly flammable material
This CodeX04Exposure to ignition of highly flammable material

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to X04: 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.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Exposure to ignition of gasoline
  • Exposure to ignition of kerosene
  • Exposure to ignition of petrol

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 X04 itself
  • exposure to ignition or melting of nightwear (X05)
  • exposure to ignition or melting of other clothing and apparel (X06)
From Block X00-X08 Exposure to smoke, fire and flames applies to 120 codes

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 code X04
Values for category X04 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 X04, its category, or a range that includes it.

Excludes2 3

These codes carry an Excludes2 note naming X04: its condition is not part of those codes, and both may be reported when the patient has both.

  • X05 Exposure to ignition or melting of nightwear
    exposure to ignition of highly flammable materials (X04.-)
  • X06 Exposure to ignition or melting of other clothing and apparel
    exposure to ignition of highly flammable materials (X04.-)
  • Block W00-W19 Slipping, tripping, stumbling and falls
    fall into fire (X00-X04, X08) names X00-X04, which includes this code

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index; each main term links to its index entry.

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 X04Overview

What is the ICD-10 code for exposure to ignition of highly flammable material?

X04 is the ICD-10-CM category for exposure to ignition of highly flammable material, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is X04 (Exposure to ignition of highly flammable material) a billable code?

No. This is a category header that groups the codes for exposure to ignition of highly flammable material, and headers cannot be submitted on claims. Claims for exposure to ignition of highly flammable material need a more specific code from this category, such as X04.XXXA, X04.XXXD, and X04.XXXS.

Can X04 be reported with X97?

Not as a rule. The Excludes1 note at block X00-X08, which applies to X04, 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).