2027 ICD-10-CM Diagnosis Code W51Accidental striking against or bumped into by another person

ICD-10-CM Codes›V01–Y99›W50-W64›W51

ICD-10-CM W51
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

W51 is a non-billable ICD-10-CM category code for accidental striking against or bumped into by another person, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W51.XXXA, W51.XXXD, and W51.XXXS.

Code Identity

ICD-10-CM Code
W51
Billable Status
No — Non-Billable Category
Code Describes
Accidental striking against or bumped into by another person
Short Description
Accidental striking against or bumped into by another person
Same as the full description in the CMS dataset.
Chapter
W50-W64
Exposure to animate mechanical forces

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionW50-W64Exposure to animate mechanical forces
CategoryW51Accidental striking against or bumped into by another person
This CodeW51Accidental striking against or bumped into by another person

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to W51: its own notes plus those printed at block W50-W64 and Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On W51 itself
  • assault by striking against or bumping into by another person (Y04.2)
  • fall due to collision with another person (W03)
From Block W50-W64 Exposure to animate mechanical forces applies to 336 codes
  • Toxic effect of contact with venomous animals and plants (T63.-)

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to code W51
Values for category W51 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name W51, its category, or a range that includes it.

Excludes1 4

These codes carry an Excludes1 note naming W51: they are not reported together with it, unless the two conditions are unrelated.

  • V00 Pedestrian conveyance accident
    collision with another person without fall (W51)
  • Block V00-V09 Pedestrian injured in transport accident
    struck or bumped by another person (W51)
  • W03 Other fall on same level due to collision with another person
    collision with another person without fall (W51)
  • W18.4 Slipping, tripping and stumbling without falling
    collision with another person without fall (W51)

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index; each main term links to its index entry.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About W51Overview

What is the ICD-10 code for accidental striking against or bumped into by another person?

W51 is the ICD-10-CM category for accidental striking against or bumped into by another person, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is W51 (Accidental striking against or bumped into by another person) a billable code?

No. This is a category header that groups the codes for accidental striking against or bumped into by another person, and headers cannot be submitted on claims. Claims for accidental striking against or bumped into by another person need a more specific code from this category, such as W51.XXXA, W51.XXXD, and W51.XXXS.

Can W51 be reported with Y04.2?

Not as a rule. The Excludes1 note on W51 lists "assault by striking against or bumping into by another person (Y04.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).