2027 ICD-10-CM Diagnosis Code Y00Assault by blunt object

ICD-10-CM Codes›V01–Y99›X92-Y09›Y00

ICD-10-CM Y00
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Y00 is a non-billable ICD-10-CM category code for assault by blunt object, so it cannot be submitted on claims. Use a more specific code from this category instead, such as Y00.XXXA, Y00.XXXD, and Y00.XXXS.

Code Identity

ICD-10-CM Code
Y00
Billable Status
No — Non-Billable Category
Code Describes
Assault by blunt object
Short Description
Assault by blunt object
Same as the full description in the CMS dataset.
Chapter
X92-Y09
Assault

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionX92-Y09Assault
CategoryY00Assault by blunt object
This CodeY00Assault by blunt object

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Y00: its own notes plus those printed at block X92-Y09 and Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block X92-Y09 Assault applies to 202 codes
  • homicide
  • injuries inflicted by another person with intent to injure or kill, by any means

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On Y00 itself
  • assault by strike by sports equipment (Y08.0-)
From Block X92-Y09 Assault applies to 202 codes
  • injuries due to legal intervention (Y35.-)
  • injuries due to operations of war (Y36.-)
  • injuries due to terrorism (Y38.-)

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to code Y00
Values for category Y00 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Y00, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Y00: they are not reported together with it, unless the two conditions are unrelated.

  • Y04 Assault by bodily force
    use of weapon (X93-X95, X99, Y00)

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index; each main term links to its index entry.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Y00Overview

What is the ICD-10 code for assault by blunt object?

Y00 is the ICD-10-CM category for assault by blunt object, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is Y00 (Assault by blunt object) a billable code?

No. This is a category header that groups the codes for assault by blunt object, and headers cannot be submitted on claims. Claims for assault by blunt object need a more specific code from this category, such as Y00.XXXA, Y00.XXXD, and Y00.XXXS.

Can Y00 be reported with a code from Y08.0?

Not as a rule. The Excludes1 note on Y00 lists "assault by strike by sports equipment (Y08.0-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).