W99 — Exposure to other man-made environmental factors
Is W99 billable?
No — W99 is a non-billable header code. W99 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath W99.
W99 at a glance
| Code | W99 |
|---|---|
| Description | Exposure to other man-made environmental factors |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is W99 listed in the External Cause Index?
These are the routes through the External Cause of Injuries Index that lead to W99 — how the injury happened, rather than what the injury was.
- Exposure › factorNOS › environmental NEC › man-made NEC (to)
Excludes1 — never code together — inherited from W85-W99
The conditions below can never be reported together with W99 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
What codes fall under W99? (3)
How long has W99 existed?
W99 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.