Accidental striking against or bumped into by another person (W51) ICD-10-CM
The W51 code range covers accidental striking against or bumped into by another person 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.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- assault by striking against or bumping into by another person Y04.2
- fall due to collision with another person W03
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 W51
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 W51 Range 4 codes · 3 billable
- W51 Accidental striking against or bumped into by another personNon-billable
- W51.XXXA Accidental striking against or bumped into by another person, initial encounter
- W51.XXXD Accidental striking against or bumped into by another person, subsequent encounter
- W51.XXXS Accidental striking against or bumped into by another person, sequela
About the W51 Code Range
W51 codes capture incidents where someone is accidentally struck or bumped into by another person, covering initial injuries, later encounters, and resulting complications.
The ICD-10 code for accidental striking against or bumped into by another person, W51, is used to document external causes of injury in events like accidental collisions during sports or being unintentionally knocked down. This includes situations described by synonyms such as "accidentally knocked down while boxing," "injury in accidental collision between swimmers," or simply "bumped into other person." Specific codes like W51.XXXA indicate the initial encounter for treatment, W51.XXXD represents subsequent encounters, and W51.XXXS is used for sequelae, or complications resulting from the original incident. These distinctions help healthcare providers and coders accurately track injury progression and management over time.
Questions About This Page
How many billable codes are in the W51 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 W51 range classify?
The range classifies accidental striking against or bumped into by another person. 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.
