W94
Header — not billableExposure to high and low air pressure and changes in air pressure
The ICD-10 code for exposure to high and low air pressure and changes in air pressure is W94.
W94 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 4 more specific codes below.
Clinical notes
7th character definitions
These definitions specify what each valid 7th-character value means for codes in this category.
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7th character note
This category requires a 7th character to indicate additional clinical detail (e.g. encounter type: initial, subsequent, sequela). The code is incomplete without it.
- The appropriate 7th character is to be added to each code from category W94
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •This category requires a 7th character. Documentation should clearly indicate the episode of care (initial encounter, subsequent encounter, or sequela).
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- W85Exposure to electric transmission lines
- W86Exposure to other specified electric currentnon-billable header
- W88Exposure to ionizing radiationnon-billable header
- W89Exposure to man-made visible and ultraviolet lightnon-billable header
- W90Exposure to other nonionizing radiationnon-billable header
- W92Exposure to excessive heat of man-made origin
- W93Exposure to excessive cold of man-made originnon-billable header
- W99Exposure to other man-made environmental factors
- W94Exposure to high and low air pressure and changes in air pressurenon-billable header