2027 ICD-10-CM Diagnosis Code X01Exposure to uncontrolled fire, not in building or structure

ICD-10-CM Codes›V01–Y99›X00-X08›X01

ICD-10-CM X01
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

X01 is a non-billable ICD-10-CM category code for exposure to uncontrolled fire, not in building or structure, so it cannot be submitted on claims. Use a more specific code from this category instead, such as X01.0XXA, X01.0XXD, X01.0XXS, and X01.1XXA.

Code Identity

ICD-10-CM Code
X01
Billable Status
No — Non-Billable Category
Code Describes
Exposure to uncontrolled fire, not in building or structure
Short Description
Exposure to uncontrolled fire, not 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
CategoryX01Exposure to uncontrolled fire, not in building or structure
This CodeX01Exposure to uncontrolled fire, not in building or structure

Specific Coding for Exposure to uncontrolled fire, not in building or structureOverview

Non-specific codes like X01 require more characters. Use one of these billable codes instead:

  • X01.0 for Exposure to flames in uncontrolled fire, not in building or structure

  • X01.1 for Exposure to smoke in uncontrolled fire, not in building or structure

  • X01.3 for Fall due to uncontrolled fire, not in building or structure

  • X01.4 for Hit by object due to uncontrolled fire, not in building or structure

  • X01.8 for Other exposure to uncontrolled fire, not in building or structure

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to X01: 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.

  • exposure to forest fire

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.

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 each code from category X01
Values for category X01 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 X01, its category, or a range that includes it.

Excludes2 3

These codes carry an Excludes2 note naming X01: 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 uncontrolled fire, not in building or structure (X01.-)
  • X06 Exposure to ignition or melting of other clothing and apparel
    exposure to uncontrolled fire, not in building or structure (X01.-)
  • Block W00-W19 Slipping, tripping, stumbling and falls
    fall into fire (X00-X04, X08) names X00-X04, which includes this code

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 X01Overview

What is the ICD-10 code for exposure to uncontrolled fire, not in building or structure?

X01 is the ICD-10-CM category for exposure to uncontrolled fire, not 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 X01 (Exposure to uncontrolled fire, not in building or structure) a billable code?

No. This is a category header that groups the codes for exposure to uncontrolled fire, not in building or structure, and headers cannot be submitted on claims. Claims for exposure to uncontrolled fire, not in building or structure need a more specific code from this category, such as X01.0XXA, X01.0XXD, and X01.0XXS.

Can X01 be reported with X97?

Not as a rule. The Excludes1 note at block X00-X08, which applies to X01, 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).