W99
W99: Exposure to other man-made environmental factors
Non-billable headerICD-10-CM
W99 is a non-billable header ICD-10-CM code for exposure to other man-made environmental factors. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to code W99
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Alphabetic index entries that lead here
- Exposure›factor NOS›environmental NEC›man-made NEC
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead W99
3 child codes. Green means billable.