ICD-10-CM > V00-Y99 > W85-W99 > W94 > W94.1 W94.1 Exposure to prolonged low air pressure Non-Billable/Non-Specific Codes W94.11Exposure to residence or prolonged visit at high altitudeW94.11XA..., initial encounterW94.11XD..., subsequent encounterW94.11XS..., sequelaW94.12Exposure to other prolonged low air pressureW94.12XA..., initial encounterW94.12XD..., subsequent encounterW94.12XS..., sequela