Pulmonary eosinophilia

This code represents an abnormal accumulation of eosinophils in the lung tissue, often identified through bronchoalveolar lavage or lung biopsy. It signifies a group of pulmonary disorders characterized by eosinophilic infiltration, which can be acute or chronic.

Use this code when documentation explicitly states "pulmonary eosinophilia" or a specific diagnosis like chronic eosinophilic pneumonia, acute eosinophilic pneumonia, or simple pulmonary eosinophilia (Löffler's syndrome). Supporting documentation should include imaging findings (e.g., infiltrates), laboratory results (e.g., peripheral eosinophilia), and/or pathology reports confirming eosinophilic infiltration.

• Always look for the underlying cause of the pulmonary eosinophilia if specified (e.g., drug-induced, parasitic infection) and code it as a secondary diagnosis.
• Do not confuse with general eosinophilia (288.3) unless the pulmonary involvement is explicitly documented.
• Ensure documentation differentiates between acute and chronic forms if a more specific code is available in other code sets.