2026 ICD-10-CM Diagnosis Code W99Exposure to other man-made environmental factors

ICD-10-CM Codes›V01–Y99›W85-W99›W99

ICD-10-CM W99
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

W99 is a non-billable ICD-10-CM category code for exposure to other man-made environmental factors, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W99.XXXA, W99.XXXD, and W99.XXXS.

Code Identity

ICD-10-CM Code
W99
Billable Status
No — Non-Billable Category
Code Describes
Exposure to other man-made environmental factors
Short Description
Exposure to other man-made environmental factors
Same as the full description in the CMS dataset.
Chapter
W85-W99
Exposure to electric current, radiation and extreme ambient air temperature and pressure

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionW85-W99Exposure to electric current, radiation and extreme ambient air temperature and pressure
CategoryW99Exposure to other man-made environmental factors
This CodeW99Exposure to other man-made environmental factors

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

7th Character Note

  • The appropriate 7th character is to be added to code W99

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

  • Exposure (to)
    • factor (s) NOS
      • environmental NEC
        • man-made NEC

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About W99Overview

Is W99 (Exposure to other man-made environmental factors) a billable code?

No. This is a category header that groups the codes for exposure to other man-made environmental factors, and headers cannot be submitted on claims. Claims for exposure to other man-made environmental factors need a more specific code from this category, such as W99.XXXA, W99.XXXD, and W99.XXXS.