Y99.9 — Unspecified external cause status
Is Y99.9 billable?
Yes, but Y99.9 is an unspecified code. Y99.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Y99.9 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 Y99.9 — the more specific alternatives are listed below.
Y99.9 at a glance
| Code | Y99.9 |
|---|---|
| Description | Unspecified external cause status |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is Y99.9 listed in the External Cause Index?
These are the routes through the External Cause of Injuries Index that lead to Y99.9 — how the injury happened, rather than what the injury was.
- External cause status
- Status of external cause
How long has Y99.9 existed?
Y99.9 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.