Y09 — Assault by unspecified means
Is Y09 billable?
Yes, but Y09 is an unspecified code. Y09 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Y09 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting Y09.
Y09 at a glance
| Code | Y09 |
|---|---|
| Description | Assault by unspecified means |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is Y09 listed in the External Cause Index?
These are the routes through the External Cause of Injuries Index that lead to Y09 — how the injury happened, rather than what the injury was.
- Assault (homicidal) (by) (in)
- Assault › injury (homicidal) (by) (in)
- Assault › violence (homicidal) (by) (in)
- Assault › weapon (homicidal) (by) (in)
- Assault › wound (homicidal) (by) (in)
- Injury, injuredNOS › homicide (accidental(ly))
Inclusion terms
Alternative wording in documentation that is classified to Y09.
- Assassination (attempted) NOS
- Homicide (attempted) NOS
- Manslaughter (attempted) NOS
- Murder (attempted) NOS
Excludes1 — never code together — inherited from X92-Y09
The conditions below can never be reported together with Y09 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
How long has Y09 existed?
Y09 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.