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ICD-10-CM 2027 diagnosis code

X04.XXXAExposure to ignition of highly flammable material, initial encounter

✓ Billable / specificRequires 7th character

X04.XXXA is a valid, billable ICD-10-CM code for exposure to ignition of highly flammable material, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Exposure to ignition of highly flammable material, init

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About X04.XXXA

X04.XXXA is the ICD-10-CM diagnosis code for exposure to ignition of highly flammable material, initial encounter. It belongs to category X04 (exposure to ignition of highly flammable material), block X00-X08 (exposure to smoke, fire and flames) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as E894 (ignition of highly inflammable material).

7th character

Ainitial encounter

Other encounter types for X04:

Notes that apply from higher levels

Instructions written at a parent level also apply to X04.XXXA.

› From X04 Exposure to ignition of highly flammable material
Excludes2
  • exposure to ignition or melting of nightwear (X05)
  • exposure to ignition or melting of other clothing and apparel (X06)

Broader instructions also apply from X00-X08 Exposure to smoke, fire and flames and Chapter 20: External causes of morbidity.

ICD-9-CM equivalent

Converter →
  • E894Ignition of highly inflammable materialapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about X04.XXXA

Is X04.XXXA billable?

Yes. X04.XXXA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of X04.XXXA mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can X04.XXXA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict X04.XXXA as a principal diagnosis.

Is X04.XXXA a CC or MCC?

No. X04.XXXA is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for X04.XXXA?

The CMS General Equivalence Mappings map X04.XXXA to ICD-9-CM E894.