W99: Exposure to other man-made environmental factors
Codes under W99 (Exposure to other man-made environmental factors). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| W99.XXXA | Exposure to other man-made environmental factors, initial encounter | ✓ |
| W99.XXXA | Exposure to other man-made environmental factors, initial encounter | ✓ |
| W99.XXXD | Exposure to other man-made environmental factors, subsequent encounter | ✓ |
| W99.XXXD | Exposure to other man-made environmental factors, subsequent encounter | ✓ |
| W99.XXXS | Exposure to other man-made environmental factors, sequela | ✓ |
| W99.XXXS | Exposure to other man-made environmental factors, sequela | ✓ |
Frequently asked questions
What is ICD-10-CM code W99?
W99 is an ICD-10-CM category covering Exposure to other man-made environmental factors. It contains 6 more specific diagnosis codes, 6 of which are billable.
Is W99 a billable code?
No — W99 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example W99.XXXA — Exposure to other man-made environmental factors, initial encounter). 6 of the 6 codes under W99 are billable.
What codes fall under W99?
W99 includes W99.XXXA, W99.XXXA, W99.XXXD, W99.XXXD, W99.XXXS, plus 1 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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