MCMedicalCodingSoftware
W51

W51: Accidental striking against or bumped into by another person

Non-billable headerICD-10-CM

W51 is a non-billable header ICD-10-CM code for accidental striking against or bumped into by another person. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to code W51

A
initial encounter
D
subsequent encounter
S
sequela

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

  • assault by striking against or bumping into by another person (Y04.2)
  • fall due to collision with another person (W03)

Other codes that can never be billed with W51

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • V00Pedestrian conveyance accident
  • W03Other fall on same level due to collision with another person
  • W03.XXXAOther fall on same level due to collision with another person, initial encounter
  • W03.XXXDOther fall on same level due to collision with another person, subsequent encounter
  • W03.XXXSOther fall on same level due to collision with another person, sequela
  • W18.4Slipping, tripping and stumbling without falling

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Bumping against, into›person(s)
  • Collision NEC›pedestrian
  • Knocked down NOS›person
  • Pushed, pushing›by other person(s) (accidental)
  • Stepping on›person
  • Striking against›person(s)
  • Stumbling›over›person
  • Tripping›over›person
  • Accident›pedestrian›with›another pedestrian

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead W51

3 child codes. Green means billable.

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.