Is ICD-10-CM code Y31 billable?

No, Y31 (Falling, lying or running before or into moving object, undetermined intent) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code Y31 belong to?

Y31 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

Y31Not billable, use a more specific code below

Falling, lying or running before or into moving object, undetermined intent

In Event of undetermined intent (Y21-Y33), chapter 20: External Causes of Morbidity

3 billable codes under Y31: none are a CC or MCC; none map to an HCC.

Instructional notes

Also applies, from Event of undetermined intent (Y21-Y33)

These notes sit on Y21-Y33 and apply to every code under it, including Y31.

Includes: conditions that are coded here

Undetermined intent is only for use when there is specific documentation in the record that the intent of the injury cannot be determined. If no such documentation is present, code to accidental (unintentional)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.

General External Cause Coding Guidelines (page 88)
Place of Occurrence Guideline (page 89)
Activity Code (page 89)
Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
If the Reporting Format Limits the Number of External Cause Codes (page 90)
Multiple External Cause Coding Guidelines (page 90)
Child and Adult Abuse Guideline (page 90)
Unknown or Undetermined Intent Guideline (page 91)

Read Section I.C.20 (page 87), 3 more topics

All codes under Y31

Y31 can't be used on a claim. Pick a billable code below; grey headings group them.

Y31 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Falls

Falls can be dangerous at any age. Babies and young children can get hurt falling off furniture or down the stairs. Older children may fall off playground equipment. For older adults, falls can be especially serious. They are at higher risk of falling. They are also more likely to fracture (break) a bone when they fall, especially if they have osteoporosis. A broken bone, especially when it is in a hip, may even lead to disability and a loss of independence for older adults.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.