Mushroom workers' lung

This code represents an extrinsic allergic alveolitis, specifically hypersensitivity pneumonitis, caused by exposure to fungal spores found in mushroom compost. It is an inflammatory lung condition resulting from an immune response to inhaled organic dusts, leading to symptoms like dyspnea, cough, and fever. Chronic exposure can lead to pulmonary fibrosis.

Use this code when documentation clearly indicates a diagnosis of hypersensitivity pneumonitis directly linked to occupational exposure in mushroom cultivation or processing. Supporting documentation should include a history of exposure to mushroom compost, clinical symptoms consistent with allergic alveolitis, and diagnostic findings such as restrictive lung disease or ground-glass opacities on imaging.

• Ensure documentation specifies the causative agent as mushroom-related to differentiate from other forms of extrinsic allergic alveolitis.
• Consider co-reporting with codes for associated respiratory symptoms (e.g., cough, dyspnea) if separately documented and treated.
• Review the patient's occupational history carefully to confirm the link between exposure and lung disease.