W99.XXXA — Exposure to other man-made environmental factors, initial encounter
Is W99.XXXA billable?
Yes — W99.XXXA is billable for FY2027. W99.XXXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. W99.XXXA may be submitted for encounters from October 1, 2026 through September 30, 2027.
W99.XXXA at a glance
| Code | W99.XXXA |
|---|---|
| Description | Exposure to other man-made environmental factors, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is W99.XXXA listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under W99, the nearest indexed parent of W99.XXXA. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- 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.XXXA 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 W99.XXXA existed?
W99.XXXA 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.