Exposure to uncontrolled fire in building or structure (X00) ICD-10-CM
The X00 code range covers exposure to uncontrolled fire in building or structure with 29 ICD-10-CM diagnosis codes. 21 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- conflagration in building or structure
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- any associated cataclysm
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- 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
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category X00
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the X00 Range 29 codes · 21 billable
- X00 Exposure to uncontrolled fire in building or structureNon-billable
- X00.0 Exposure to flames in uncontrolled fire in building or structureNon-billable
- X00.0XXA Exposure to flames in uncontrolled fire in building or structure, initial encounter
- X00.0XXD Exposure to flames in uncontrolled fire in building or structure, subsequent encounter
- X00.0XXS Exposure to flames in uncontrolled fire in building or structure, sequela
- X00.1 Exposure to smoke in uncontrolled fire in building or structureNon-billable
- X00.1XXA Exposure to smoke in uncontrolled fire in building or structure, initial encounter
- X00.1XXD Exposure to smoke in uncontrolled fire in building or structure, subsequent encounter
- X00.1XXS Exposure to smoke in uncontrolled fire in building or structure, sequela
- X00.2 Injury due to collapse of burning building or structure in uncontrolled fireNon-billable
- X00.2XXA Injury due to collapse of burning building or structure in uncontrolled fire, initial encounter
- X00.2XXD Injury due to collapse of burning building or structure in uncontrolled fire, subsequent encounter
- X00.2XXS Injury due to collapse of burning building or structure in uncontrolled fire, sequela
- X00.3 Fall from burning building or structure in uncontrolled fireNon-billable
- X00.3XXA Fall from burning building or structure in uncontrolled fire, initial encounter
- X00.3XXD Fall from burning building or structure in uncontrolled fire, subsequent encounter
- X00.3XXS Fall from burning building or structure in uncontrolled fire, sequela
- X00.4 Hit by object from burning building or structure in uncontrolled fireNon-billable
- X00.4XXA Hit by object from burning building or structure in uncontrolled fire, initial encounter
- X00.4XXD Hit by object from burning building or structure in uncontrolled fire, subsequent encounter
- X00.4XXS Hit by object from burning building or structure in uncontrolled fire, sequela
- X00.5 Jump from burning building or structure in uncontrolled fireNon-billable
- X00.5XXA Jump from burning building or structure in uncontrolled fire, initial encounter
- X00.5XXD Jump from burning building or structure in uncontrolled fire, subsequent encounter
- X00.5XXS Jump from burning building or structure in uncontrolled fire, sequela
- X00.8 Other exposure to uncontrolled fire in building or structureNon-billable
- X00.8XXA Other exposure to uncontrolled fire in building or structure, initial encounter
- X00.8XXD Other exposure to uncontrolled fire in building or structure, subsequent encounter
- X00.8XXS Other exposure to uncontrolled fire in building or structure, sequela
About the X00 Code Range
An uncontrolled fire in a building or other structure can expose someone to flames or smoke, or cause an injury during the fire.
X00 separates exposure to flames from exposure to smoke. Its other subdivisions distinguish injuries caused by a collapse, a fall, an object from the burning structure, or a jump. Another subdivision covers other exposure to the fire.
Each subdivision ends with a seventh character: A for initial encounter, D for subsequent encounter, or S for sequela.
Questions About This Page
How many billable codes are in the X00 range?
Of the 29 codes in this range, 21 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the X00 range classify?
The range classifies exposure to uncontrolled fire in building or structure. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
