Is ICD-10-CM code X04 billable?

No, X04 (Exposure to ignition of highly flammable material) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code X04 belong to?

X04 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

X04Not billable, use a more specific code below

Exposure to ignition of highly flammable material

In Exposure to smoke, fire and flames (X00-X08), chapter 20: External Causes of Morbidity

3 billable codes under X04: none are a CC or MCC; none map to an HCC.

Instructional notes

Includes: conditions that are coded here

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

Excludes2: not included here, code separately if applicable

exposure to ignition or melting of nightwear (X05)
exposure to ignition or melting of other clothing and apparel (X06)

Also applies, from Exposure to smoke, fire and flames (X00-X08)

These notes sit on X00-X08 and apply to every code under it, including X04.

Excludes1: not coded here, use a different code

arson (X97)

Excludes2: not included here, code separately if applicable

explosions (W35-W40)
lightning (T75.0-)
transport accident (V01-V99)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.

General External Cause Coding Guidelines (page 88)
Place of Occurrence Guideline (page 89)
Activity Code (page 89)
Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
If the Reporting Format Limits the Number of External Cause Codes (page 90)
Multiple External Cause Coding Guidelines (page 90)
Child and Adult Abuse Guideline (page 90)
Unknown or Undetermined Intent Guideline (page 91)

Read Section I.C.20 (page 87), 3 more topics

All codes under X04

X04 can't be used on a claim. Pick a billable code below; grey headings group them.

X04 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

Other codes that refer to X04

Notes on these codes point to X04.

W00-W19 Excludes2: fall into fire (X00-X04, X08)
X05 Excludes2: exposure to ignition of highly flammable materials (X04.-)
X06 Excludes2: exposure to ignition of highly flammable materials (X04.-)

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.