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ICD-10-CM 2027 diagnosis code

Y09Assault by unspecified means

✓ Billable / specific

Y09 is a valid, billable ICD-10-CM code for assault by unspecified means. 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 Y09

Y09 is the ICD-10-CM diagnosis code for assault by unspecified means. It belongs to 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.

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 E968.9 (assault by unspecified means).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Assassination (attempted) NOS
  • Homicide (attempted) NOS
  • Manslaughter (attempted) NOS
  • Murder (attempted) NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to Y09.

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

Alphabetic index entries

6 entries

Terms in the official ICD-10-CM index that lead to Y09.

ICD-9-CM equivalent

Converter →
  • E968.9Assault by unspecified meansexact

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 Y09

Is Y09 billable?

Yes. Y09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Y09 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Y09 as a principal diagnosis.

Is Y09 a CC or MCC?

No. Y09 is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for Y09?

The CMS General Equivalence Mappings map Y09 to ICD-9-CM E968.9.