Bird fancier's lung

Bird fancier's lung is a form of hypersensitivity pneumonitis, an inflammatory lung disease caused by repeated inhalation of avian antigens, typically from feathers, droppings, or dander. This immune-mediated reaction leads to inflammation of the alveoli and small airways, potentially causing progressive lung damage if exposure continues.

This code is appropriate for documenting a diagnosis of hypersensitivity pneumonitis specifically attributed to exposure to avian antigens. Documentation should clearly indicate a history of exposure to birds (e.g., pet birds, poultry farming) and clinical findings consistent with hypersensitivity pneumonitis, such as dyspnea, cough, and infiltrates on imaging.

• Ensure documentation explicitly links the lung condition to avian antigen exposure.
• Consider sequencing this code after any acute exacerbation codes if applicable.
• Differentiate from other forms of hypersensitivity pneumonitis where the specific antigen is known (e.g., farmer's lung).