Exposure to smoke, fire and flames, undetermined intent (Y26) ICD-10-CM
The Y26 code range covers exposure to smoke, fire and flames, undetermined intent with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
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 code Y26
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 Y26 Range 4 codes · 3 billable
- Y26 Exposure to smoke, fire and flames, undetermined intentNon-billable
- Y26.XXXA Exposure to smoke, fire and flames, undetermined intent, initial encounter
- Y26.XXXD Exposure to smoke, fire and flames, undetermined intent, subsequent encounter
- Y26.XXXS Exposure to smoke, fire and flames, undetermined intent, sequela
About the Y26 Code Range
The ICD-10 code Y26 covers situations where a person is exposed to smoke, fire, or flames, but the intent behind the exposure is unclear or undetermined. This section is used to document injuries caused by fire or smoke when it’s not known whether they were accidental, intentional, or self-inflicted.
This category includes specific codes for different phases of care: Y26.XXXA for the initial encounter, Y26.XXXD for subsequent encounters, and Y26.XXXS for sequela or complications following the exposure. These codes help distinguish between the timing of medical treatment after an injury resulting from "injury of unknown intent by burns or fire." For medical coders, accurate use of these codes ensures proper classification of injuries where the cause behind the burns or smoke exposure cannot be confirmed, often described as injury of unknown intent by burns or fire. Searching for the ICD-10 code for exposure to smoke and fire of undetermined intent will lead directly to these codes.
Questions About This Page
How many billable codes are in the Y26 range?
Of the 4 codes in this range, 3 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 Y26 range classify?
The range classifies exposure to smoke, fire and flames, undetermined intent. 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.
