ICD-10-CM 2027 diagnosis code

Y04Assault by bodily force

Not billable — use a more specific code

Y04 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

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

Y04 is the ICD-10-CM diagnosis code for assault by bodily force. It belongs to 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 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Y04.0 (fight), Y04.1 (bite), Y04.2 (person) and Y04.8 (force).

Don't report Y04 together with the conditions in its Excludes1 note: submersion (X92.-) and use of weapon (X93-X95, X99, Y00).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Y04

Coding notes

Excludes1Not coded here — never report together with this code

assault by:
submersion (X92.-)
use of weapon (X93-X95, X99, Y00)

Notes that apply from higher levels

Instructions written at a parent level also apply to Y04.

Broader instructions also apply from X92-Y09 Assault and Chapter 20: External causes of morbidity.

Codes whose notes reference Y04

W50Excludes1

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

Is Y04 billable?: No. Y04 is a header code. Report one of its more specific subcodes instead.