W94.0Exposure to prolonged high air pressure

W94.0 is the ICD-10-CM diagnosis code for exposure to prolonged high air pressure. It belongs to category W94 (exposure to high and low air pressure and changes in air pressure), block W85-W99 (exposure to electric current, radiation and extreme ambient air temperature and pressure) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within W94 (exposure to high and low air pressure and changes in air pressure), W94.0 is specifically for exposure to prolonged high air pressure. Related codes cover prolonged low air pressure (W94.1), rapid changes in air pressure during ascent (W94.2) and rapid changes in air pressure during descent (W94.3).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.