X00

ICD-10Non-billable category

Exposure to uncontrolled fire in building or structure

Official ICD-10-CM descriptor (FY2026)

Exposure to uncontrolled fire in building or structure

X00 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Includes

  • conflagration in building or structure

Excludes2

Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.

  • 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.-)

Code first

Sequence the underlying condition before this code.

  • any associated cataclysm

7th character

  • The appropriate 7th character is to be added to each code from category X00

Permitted 7th characters

Ainitial encounter
Dsubsequent encounter
Ssequela

More specific codes under X00

Where this code sits

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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