Rank	ICD-9-CM Code	Description	Frequency	Percentage
1	515	Postinflammatory pulmonary fibrosis	162	13.8
2	486	Pneumonia, organism unspecified	60	5.1
3	516.3	Idiopathic fibrosing alveolitis	45	3.8
4	V57.89	Other specified rehabilitation procedure	43	3.7
5	518.81	Respiratory failure	42	3.6
6	428	Congestive heart failure	34	2.9
7	491.21	Obstructive chronic bronchitis with exacerbations	27	2.3
8	427.31	Atrial fibrillation	26	2.2
9	389	Unspecified septicemia	15	1.3
10	410.71	Subendocardial infarction, initial episode of care	15	1.3

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