ICD-10-CM Code W94

Exposure to high and low air pressure and changes in air pressure

Version 2020 Non-Billable Code

Not Valid for Submission

W94 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of exposure to high and low air pressure and changes in air pressure. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:W94
Short Description:Expsr to high and low air pressr and changes in air pressure
Long Description:Exposure to high and low air pressure and changes in air pressure

Consider the following ICD-10 codes with a higher level of specificity:

  • W94.0 - Exposure to prolonged high air pressure
  • W94.0XXA - Exposure to prolonged high air pressure, initial encounter
  • W94.0XXD - Exposure to prolonged high air pressure, subsequent encounter
  • W94.0XXS - Exposure to prolonged high air pressure, sequela
  • W94.1 - Exposure to prolonged low air pressure
  • W94.11 - Exposure to residence or prolonged visit at high altitude
  • W94.11XA - Exposure to residence or prolonged visit at high altitude, initial encounter
  • W94.11XD - Exposure to residence or prolonged visit at high altitude, subsequent encounter
  • W94.11XS - Exposure to residence or prolonged visit at high altitude, sequela
  • W94.12 - Exposure to other prolonged low air pressure
  • W94.12XA - Exposure to other prolonged low air pressure, initial encounter
  • W94.12XD - Exposure to other prolonged low air pressure, subsequent encounter
  • W94.12XS - Exposure to other prolonged low air pressure, sequela
  • W94.2 - Exposure to rapid changes in air pressure during ascent
  • W94.21 - Exposure to reduction in atmospheric pressure while surfacing from deep-water diving
  • W94.21XA - Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter
  • W94.21XD - Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter
  • W94.21XS - Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela
  • W94.22 - Exposure to reduction in atmospheric pressure while surfacing from underground
  • W94.22XA - Exposure to reduction in atmospheric pressure while surfacing from underground, initial encounter
  • W94.22XD - Exposure to reduction in atmospheric pressure while surfacing from underground, subsequent encounter
  • W94.22XS - Exposure to reduction in atmospheric pressure while surfacing from underground, sequela
  • W94.23 - Exposure to sudden change in air pressure in aircraft during ascent
  • W94.23XA - Exposure to sudden change in air pressure in aircraft during ascent, initial encounter
  • W94.23XD - Exposure to sudden change in air pressure in aircraft during ascent, subsequent encounter
  • W94.23XS - Exposure to sudden change in air pressure in aircraft during ascent, sequela
  • W94.29 - Exposure to other rapid changes in air pressure during ascent
  • W94.29XA - Exposure to other rapid changes in air pressure during ascent, initial encounter
  • W94.29XD - Exposure to other rapid changes in air pressure during ascent, subsequent encounter
  • W94.29XS - Exposure to other rapid changes in air pressure during ascent, sequela
  • W94.3 - Exposure to rapid changes in air pressure during descent
  • W94.31 - Exposure to sudden change in air pressure in aircraft during descent
  • W94.31XA - Exposure to sudden change in air pressure in aircraft during descent, initial encounter
  • W94.31XD - Exposure to sudden change in air pressure in aircraft during descent, subsequent encounter
  • W94.31XS - Exposure to sudden change in air pressure in aircraft during descent, sequela
  • W94.32 - Exposure to high air pressure from rapid descent in water
  • W94.32XA - Exposure to high air pressure from rapid descent in water, initial encounter
  • W94.32XD - Exposure to high air pressure from rapid descent in water, subsequent encounter
  • W94.32XS - Exposure to high air pressure from rapid descent in water, sequela
  • W94.39 - Exposure to other rapid changes in air pressure during descent
  • W94.39XA - Exposure to other rapid changes in air pressure during descent, initial encounter
  • W94.39XD - Exposure to other rapid changes in air pressure during descent, subsequent encounter
  • W94.39XS - Exposure to other rapid changes in air pressure during descent, sequela

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code W94:

7th Character Note

7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
  • The appropriate 7th character is to be added to each code from category W94

7th Character

7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Code Classification

  • External causes of morbidity and mortality (V01–Y98)
    • Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99)
      • Expsr to high and low air pressr and changes in air pressure (W94)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020