- Cryptogenic organizing pneumonia (previously called bronchiolitis obliterans organizing pneumonia): May be focal, patchy, or diffuse
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- Chronic heart or renal failure
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- Granulomatosis with polyangiitis
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- Polymyositis/dermatomyositis
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- Systemic lupus erythematosus
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- Hematologic malignancy (eg, diffuse large B-cell lymphoma, leukemia, non-Hodgkin lymphoma)
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- Hypersensitivity pneumonitis
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- Immunodeficiency syndromes
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- Common variable immunodeficiency
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- Bacterial (eg, Chlamydia pneumoniae, Legionella pneumophila, Mycoplasma pneumoniae, Nocardia asteroides)
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- Fungal (Aspergillus, Pneumocystis jirovecii)
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- Mycobacterial (Mycobacterium avium complex)
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- Protozoa (Plasmodium vivax)
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- Inflammatory bowel disease
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- Inhalation injury (eg, aspiration of gastric contents, sulfur dioxide)
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- Irradiation injury (eg, breast cancer)
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- Reaction around other lung processes
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- Diffuse alveolar hemorrhage
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- Lung tumor or other airway obstruction
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- Transplantation (eg, allogeneic hematopoietic cell, liver, lung)
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- Association with other interstitial pneumonias
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- Chronic eosinophilic pneumonia
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- Hypersensitivity pneumonitis
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- Nonspecific interstitial pneumonia
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- Organizing diffuse alveolar damage/acute respiratory distress syndrome (ARDS)
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- Usual interstitial pneumonia (minor scattered foci)
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