Mushroom-worker's lung

This code represents a hypersensitivity pneumonitis, specifically an extrinsic allergic alveolitis, caused by exposure to spores from cultivated mushrooms, particularly Agaricus bisporus. It is an inflammatory lung condition resulting from an immune response to inhaled organic dusts.

Assign this code when documentation clearly indicates a diagnosis of mushroom-worker's lung, often presenting with symptoms like dyspnea, cough, and fever, in individuals with occupational exposure to mushroom cultivation. Supporting documentation should include a history of exposure and clinical findings consistent with hypersensitivity pneumonitis.

• Differentiate from other forms of hypersensitivity pneumonitis; ensure the specific allergen (mushroom spores) is documented.
• Consider sequencing this code as a primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is an underlying condition affecting treatment.
• Review the patient's occupational history for clear evidence of exposure to mushroom cultivation environments.