Air conditioner and humidifier lung

This code represents hypersensitivity pneumonitis, specifically when caused by exposure to antigens originating from air conditioning systems or humidifiers. It is an inflammatory lung condition resulting from an immune response to inhaled organic dusts, molds, or bacteria present in these devices.

Use this code when documentation clearly indicates a diagnosis of hypersensitivity pneumonitis directly attributed to exposure to air conditioners or humidifiers. This diagnosis is typically supported by a history of exposure, relevant clinical symptoms (e.g., dyspnea, cough), and diagnostic findings consistent with hypersensitivity pneumonitis.

• Ensure documentation explicitly links the lung condition to air conditioner or humidifier exposure.
• Do not confuse with other forms of hypersensitivity pneumonitis (e.g., farmer's lung, bird fancier's lung) which have specific codes.
• Consider sequencing this code as the primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity affecting treatment.