Exposure to controlled fire, not in building or structure (X03) ICD-10-CM
The X03 code range covers exposure to controlled fire, not in building or structure with 21 ICD-10-CM diagnosis codes. 15 of them are billable and valid for claim submission in fiscal year 2026, 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.
- exposure to bon fire
- exposure to camp-fire
- exposure to trash fire
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 X03
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 X03 Range 21 codes · 15 billable
- X03 Exposure to controlled fire, not in building or structureNon-billable
- X03.0 Exposure to flames in controlled fire, not in building or structureNon-billable
- X03.0XXA Exposure to flames in controlled fire, not in building or structure, initial encounter
- X03.0XXD Exposure to flames in controlled fire, not in building or structure, subsequent encounter
- X03.0XXS Exposure to flames in controlled fire, not in building or structure, sequela
- X03.1 Exposure to smoke in controlled fire, not in building or structureNon-billable
- X03.1XXA Exposure to smoke in controlled fire, not in building or structure, initial encounter
- X03.1XXD Exposure to smoke in controlled fire, not in building or structure, subsequent encounter
- X03.1XXS Exposure to smoke in controlled fire, not in building or structure, sequela
- X03.3 Fall due to controlled fire, not in building or structureNon-billable
- X03.3XXA Fall due to controlled fire, not in building or structure, initial encounter
- X03.3XXD Fall due to controlled fire, not in building or structure, subsequent encounter
- X03.3XXS Fall due to controlled fire, not in building or structure, sequela
- X03.4 Hit by object due to controlled fire, not in building or structureNon-billable
- X03.4XXA Hit by object due to controlled fire, not in building or structure, initial encounter
- X03.4XXD Hit by object due to controlled fire, not in building or structure, subsequent encounter
- X03.4XXS Hit by object due to controlled fire, not in building or structure, sequela
- X03.8 Other exposure to controlled fire, not in building or structureNon-billable
- X03.8XXA Other exposure to controlled fire, not in building or structure, initial encounter
- X03.8XXD Other exposure to controlled fire, not in building or structure, subsequent encounter
- X03.8XXS Other exposure to controlled fire, not in building or structure, sequela
About the X03 Code Range
The ICD-10 code X03 series captures injuries or exposures related to controlled fires that occur outside buildings or structures. These codes document incidents such as burns, smoke inhalation, falls, or impacts caused by outdoor fires like campfires, bonfires, or trash fires.
This section helps medical coders specify the nature and circumstances of exposure to controlled outdoor fires. For example, X03.0XXA is used for an initial encounter involving exposure to flames from a controlled fire, such as a barbecue or incinerator fire, while X03.1XXA codes exposure to smoke in such settings. The section also differentiates between initial encounters, subsequent encounters, and sequela (aftereffects) using 7th character extensions like “A” for initial and “D” for subsequent encounters. Injuries caused by falling due to a controlled fire or being hit by an object related to the fire are coded with X03.3 and X03.4 variants respectively. These precise designations ensure accurate documentation when treating and reporting accidents caused directly by controlled fires outside structures.
Questions About This Page
How many billable codes are in the X03 range?
Of the 21 codes in this range, 15 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the X03 range classify?
The range classifies exposure to controlled fire, not 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
