W99Header code — not billable
Exposure to other man-made environmental factors
- Chapter
- 20. External causes of morbidity
- Category
- W99
- Effective date
- October 1, 2026
Related codes in category W99
Frequently asked questions
What is ICD-10 code W99?
W99 is an ICD-10-CM diagnosis code for Exposure to other man-made environmental factors.
Is W99 a billable code?
No. W99 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is W99 in?
W99 falls under Chapter 20: External causes of morbidity.
When did W99 become effective?
W99 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to W99?
W99 belongs to category W99, which includes 3 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.