ICD-10-CM 2027 diagnosis code

Y00Assault by blunt object

Not billable — use a more specific code

Y00 is a header code, so it can't be reported by itself. Choose one of the 3 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 Y00

Y00 is the ICD-10-CM diagnosis code for assault by blunt object. 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 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Y00.XXXA (initial encounter), Y00.XXXD (subsequent encounter) and Y00.XXXS (sequela).

Don't report Y00 together with the conditions in its Excludes1 note: assault by strike by sports equipment (Y08.0-).

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 Y00

Coding notes

Excludes1Not coded here — never report together with this code

assault by strike by sports equipment (Y08.0-)

Notes that apply from higher levels

Instructions written at a parent level also apply to Y00.

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

Alphabetic index entries

5 entries

Terms in the official ICD-10-CM index that lead to Y00.

Codes whose notes reference Y00

Y04Excludes1

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 Y00

Is Y00 billable?: No. Y00 is a header code. Report one of its more specific subcodes instead.