Y00Header code — not billable

Assault by blunt object

Chapter
20. External causes of morbidity
Category
Y00
Effective date
October 1, 2026

Related codes in category Y00

Y00.XXXAAssault by blunt object, initial encounterYesY00.XXXDAssault by blunt object, subsequent encounterYesY00.XXXSAssault by blunt object, sequelaYes

Frequently asked questions

What is ICD-10 code Y00?

Y00 is an ICD-10-CM diagnosis code for Assault by blunt object.

Is Y00 a billable code?

No. Y00 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is Y00 in?

Y00 falls under Chapter 20: External causes of morbidity.

When did Y00 become effective?

Y00 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to Y00?

Y00 belongs to category Y00, which includes 3 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.