W90.0XXA — Exposure to radiofrequency, initial encounter
Is W90.0XXA billable?
Yes — W90.0XXA is billable for FY2027. W90.0XXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. W90.0XXA may be submitted for encounters from October 1, 2026 through September 30, 2027.
W90.0XXA at a glance
| Code | W90.0XXA |
|---|---|
| Description | Exposure to radiofrequency, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in W90.0XXA?
In W90.0XXA, the 7th character A means initial encounter. The 7th character is required for W90.0XXA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is W90.0XXA listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under W90.0, the nearest indexed parent of W90.0XXA. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Radiation › radar (exposure to)
- Radiation › radiofrequency (exposure to)
Excludes1 — never code together — inherited from W85-W99
The conditions below can never be reported together with W90.0XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from W90
The conditions below are not part of W90.0XXA, but a patient may have both at the same time. When documentation supports it, W90.0XXA and the excluded code may both be reported.
- exposure to sunlight (X32)
How long has W90.0XXA existed?
W90.0XXA 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.