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ICD-10-CM 2027 diagnosis code

Y00.XXXAAssault by blunt object, initial encounter

✓ Billable / specificRequires 7th character

Y00.XXXA is a valid, billable ICD-10-CM code for assault by blunt object, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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.XXXA

Y00.XXXA is the ICD-10-CM diagnosis code for assault by blunt object, initial encounter. It belongs to category Y00 (assault by blunt object), block X92-Y09 (assault) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

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

Before ICD-10, this condition was coded in ICD-9-CM as E968.2 (assault by striking by blunt or thrown object).

7th character

Ainitial encounter

Other encounter types for Y00:

Notes that apply from higher levels

Instructions written at a parent level also apply to Y00.XXXA.

› From Y00 Assault by blunt object
Excludes1
  • assault by strike by sports equipment (Y08.0-)

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

ICD-9-CM equivalent

Converter →
  • E968.2Assault by striking by blunt or thrown objectapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Y00.XXXA

Is Y00.XXXA billable?

Yes. Y00.XXXA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of Y00.XXXA mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can Y00.XXXA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Y00.XXXA as a principal diagnosis.

Is Y00.XXXA a CC or MCC?

No. Y00.XXXA is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for Y00.XXXA?

The CMS General Equivalence Mappings map Y00.XXXA to ICD-9-CM E968.2.