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  2. ICD-10-CM Codes List
  3. V01–Y99
  4. Y21-Y33
  5. Falling, lying or running before or into moving object, undetermined intent (Y31)

Falling, lying or running before or into moving object, undetermined intent (Y31)

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.

Instructional Notations

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