Y99.1 — Military activity
Is Y99.1 billable?
Yes — Y99.1 is billable for FY2027. Y99.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Y99.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Y99.1 at a glance
| Code | Y99.1 |
|---|---|
| Description | Military activity |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is Y99.1 listed in the External Cause Index?
These are the routes through the External Cause of Injuries Index that lead to Y99.1 — how the injury happened, rather than what the injury was.
- External cause status › military activity
- Status of external cause › military activity
Excludes1 — never code together
The conditions below can never be reported together with Y99.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- activity of off duty military personnel (Y99.8)
How long has Y99.1 existed?
Y99.1 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.