ICD-10-CM 2027 diagnosis code
Y04.0Assault by unarmed brawl or fight
Y04.0 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Y04.0
Y04.0 is the ICD-10-CM diagnosis code for assault by unarmed brawl or fight. It belongs to category Y04 (assault by bodily force), block X92-Y09 (assault) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within Y04 (assault by bodily force), Y04.0 is specifically for assault by unarmed brawl or fight. Related codes cover human bite (Y04.1), strike against or bumped into by another person (Y04.2) and other bodily force (Y04.8).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
The appropriate 7th character is to be added to each code from category Y04
Notes that apply from higher levels
Instructions written at a parent level also apply to Y04.0.
› From Y04 Assault by bodily force
Broader instructions also apply from X92-Y09 Assault and Chapter 20: External causes of morbidity.
Alphabetic index entries
20 entriesTerms in the official ICD-10-CM index that lead to Y04.0.
- Assault (homicidal) (by) (in) › bodily force › unarmed fight
- Assault (homicidal) (by) (in) › brawl (hand) (fists) (foot) (unarmed)
- Assault (homicidal) (by) (in) › fight (hand) (fists) (foot) (unarmed)
- Brawl (hand) (fists) (foot)
- Injury, injured (accidental(ly)) NOS › due to, in › fight
- Kicked by › person (s) (accidentally) › with intent to injure or kill
- Kicked by › person (s) (accidentally) › assault
- Kicked by › person (s) (accidentally) › homicide (attempt)
- Kicked by › person (s) (accidentally) › in › fight
- Killed, killing (accidentally) NOS › in › brawl, fight (hand) (fists) (foot)
- Knocked down (accidentally) (by) NOS › person › in brawl, fight
- Manhandling (in brawl, fight)
- Scratched by › person (s) (accidentally) › with intent to injure or kill
- Scratched by › person (s) (accidentally) › assault
- Scratched by › person (s) (accidentally) › homicide (attempt)
- Scratched by › person (s) (accidentally) › in › fight
- Twisted by person (s) (accidentally) › with intent to injure or kill
- Twisted by person (s) (accidentally) › assault
- Twisted by person (s) (accidentally) › homicide (attempt)
- Twisted by person (s) (accidentally) › in › fight
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Y04.0
Is Y04.0 billable?
- No. Y04.0 is a header code. Report one of its more specific subcodes instead.