Falling, lying or running before or into moving object, undetermined intent (Y31) ICD-10-CM
The Y31 code range covers falling, lying or running before or into moving object, 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 Y31
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 Y31 Range 4 codes · 3 billable
- Y31 Falling, lying or running before or into moving object, undetermined intentNon-billable
- Y31.XXXA Falling, lying or running before or into moving object, undetermined intent, initial encounter
- Y31.XXXD Falling, lying or running before or into moving object, undetermined intent, subsequent encounter
- Y31.XXXS Falling, lying or running before or into moving object, undetermined intent, sequela
About the Y31 Code Range
The ICD-10 code Y31 is used to classify injuries sustained from falling, lying, or running into a moving object when it is unclear whether this was accidental or deliberate. This section helps to document external causes of injury with undetermined intent.
This set of codes covers incidents described by terms such as "injury undetermined whether accidentally or purposely inflicted by jumping or lying before a moving object." The codes differentiate between the stages of care: Y31.XXXA for the initial encounter, Y31.XXXD for subsequent encounters, and Y31.XXXS for sequela, which refers to complications or conditions directly resulting from the initial injury. Medical coders and healthcare providers use these codes when the circumstances of the injury—whether accidental or intentional—cannot be definitively determined, especially for injuries involving contact with moving objects while the person is falling, lying down, or running. Understanding these nuances aids in accurate reporting and analysis of injury causes and outcomes.
Questions About This Page
How many billable codes are in the Y31 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 Y31 range classify?
The range classifies falling, lying or running before or into moving object, 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.
