Assault by bodily force (Y04) ICD-10-CM
The Y04 code range covers assault by bodily force with 17 ICD-10-CM diagnosis codes. 12 of them are billable and valid for claim submission in fiscal year 2027, 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.
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 each code from category Y04
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 Y04 Range 17 codes · 12 billable
- Y04 Assault by bodily forceNon-billable
- Y04.0 Assault by unarmed brawl or fightNon-billable
- Y04.0XXA Assault by unarmed brawl or fight, initial encounter
- Y04.0XXD Assault by unarmed brawl or fight, subsequent encounter
- Y04.0XXS Assault by unarmed brawl or fight, sequela
- Y04.1 Assault by human biteNon-billable
- Y04.1XXA Assault by human bite, initial encounter
- Y04.1XXD Assault by human bite, subsequent encounter
- Y04.1XXS Assault by human bite, sequela
- Y04.2 Assault by strike against or bumped into by another personNon-billable
- Y04.2XXA Assault by strike against or bumped into by another person, initial encounter
- Y04.2XXD Assault by strike against or bumped into by another person, subsequent encounter
- Y04.2XXS Assault by strike against or bumped into by another person, sequela
- Y04.8 Assault by other bodily forceNon-billable
- Y04.8XXA Assault by other bodily force, initial encounter
- Y04.8XXD Assault by other bodily force, subsequent encounter
- Y04.8XXS Assault by other bodily force, sequela
About the Y04 Code Range
These codes describe assaults involving bodily force, such as an unarmed fight, a human bite, or being struck by another person.
Under Y04, subdivisions separate unarmed brawls or fights, human bites, being struck or bumped into by another person, and other bodily force. Each subdivision ends with a character for an initial encounter (A), subsequent encounter (D), or sequela (S, later effects).
Questions About This Page
How many billable codes are in the Y04 range?
Of the 17 codes in this range, 12 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the Y04 range classify?
The range classifies assault by bodily force. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
