Claims identifying chronic obstructive pulmonary disease (ICD-9-CM 491.xx, 492.x, 496, 506.4, 518.1, and 518.2); cystic fibrosis (ICD-9-CM 277.0x); and interstitial lung disease (ICD-9-CM 135, 162, 237.7, 272.7, 277.3, 277.8, 416.0, 446.21, 446.4, 495, 500-505, 506.4, 508.1, 508.8, 516, 519.9, 517.2, 517.8, 518.3, and 555).

Codes identifying lower respiratory tract infection: pulmonary tuberculosis (011); pulmonary anthrax (022.1); and pulmonary diseases caused by Mycobacterium (031.0), whooping cough (033), respiratory syncytial virus (079.6), syphilis of lung (095.1), acute bronchitis (466.0), acute bronchiolitis (466.1), pneumonia (480-486), influenza (487), influenza due to identified 2009 H1N1 influenza virus (488.1), emphysema (510), pleurisy with effusion (511.1), abscess of lung and mediastinum (513), rheumatic pneumonia (517.1), or congenital pneumonia (770.0) during the pre-ICS baseline period.25

ICD-9-CM = International Classification of Diseases, Ninth Revision, Clinical Modification.