allergic disease extrinsic allergic alveolitis true ICD9:495 A common interstitial lung disease caused by hypersensitivity reactions of PULMONARY ALVEOLI after inhalation of and sensitization to environmental antigens of microbial, animal, or chemical sources. The disease is characterized by lymphocytic alveolitis and granulomatous pneumonitis. MESH:D000542 DOID:841 SNOMEDCT:37471005 MedDRA:10015887 NCIt:C34369 Sirarat Sarntivijai Alveolitis, Extrinsic Allergic