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

W94.11 is the ICD-10-CM diagnosis code for exposure to residence or prolonged visit at high altitude. 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 W94.1 (exposure to prolonged low air pressure), W94.11 is specifically for exposure to residence or prolonged visit at high altitude. Related codes cover other prolonged low air pressure (W94.12).

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.