2026 ICD-10-CM Diagnosis Code W94Exposure to high and low air pressure and changes in air pressure

ICD-10-CM Codes›V01–Y99›W85-W99›W94

ICD-10-CM W94
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

W94 is a non-billable ICD-10-CM category code for exposure to high and low air pressure and changes in air pressure, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W94.0XXA, W94.0XXD, W94.0XXS, and W94.11XA.

Code Identity

ICD-10-CM Code
W94
Billable Status
No — Non-Billable Category
Code Describes
Exposure to high and low air pressure and changes in air pressure
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
CategoryW94Exposure to high and low air pressure and changes in air pressure
This CodeW94Exposure to high and low air pressure and changes in air pressure

Specific Coding for Expsr to high and low air pressr and changes in air pressureOverview

Non-specific codes like W94 require more characters. Use one of these billable codes instead:

  • W94.0 for Exposure to prolonged high air pressure

  • W94.1 for Exposure to prolonged low air pressure

  • W94.11 for Exposure to residence or prolonged visit at high altitude

  • W94.12 for Exposure to other prolonged low air pressure

  • W94.2 for Exposure to rapid changes in air pressure during ascent

  • W94.21 for Exposure to reduction in atmospheric pressure while surfacing from deep-water diving

  • W94.22 for Exposure to reduction in atmospheric pressure while surfacing from underground

  • W94.23 for Exposure to sudden change in air pressure in aircraft during ascent

  • W94.29 for Exposure to other rapid changes in air pressure during ascent

  • W94.3 for Exposure to rapid changes in air pressure during descent

  • W94.31 for Exposure to sudden change in air pressure in aircraft during descent

  • W94.32 for Exposure to high air pressure from rapid descent in water

  • W94.39 for Exposure to other rapid changes in air pressure during descent

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 each code from category W94

7th Character

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

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 W94Overview

Is W94 a billable code?

No. This is a category header that groups the codes for exposure to high and low air pressure and changes in air pressure, and headers cannot be submitted on claims. Claims for exposure to high and low air pressure and changes in air pressure need a more specific code from this category, such as W94.0XXA, W94.0XXD, and W94.0XXS.