Idiopathic Interstitial Pneumonias

**Definition:** A group of interstitial lung diseases with no known etiology. There are several entities with varying patterns of inflammation and fibrosis. They are classified by their distinct clinical-radiological-pathological features and prognosis. They include IDIOPATHIC PULMONARY FIBROSIS; CRYPTOGENIC ORGANIZING PNEUMONIA; and others.

**Tree numbers:** - C08.381.483.652.500.750

**Synonyms:** - Idiopathic Interstitial Pneumonia