Table 2.

Most common primary diagnosis in patients discharged with a secondary diagnosis of idiopathic pulmonary fibrosis

Diagnosis	N	Per cent
Acute and chronic respiratory failure	1799	12.3
Other diseases of respiratory system, not elsewhere classified	1394	9.6
Acute respiratory failure	1106	7.6
Pneumonia, organism unspecified	940	6.4
Heart failure	747	5.1
Acute bronchitis and bronchiolitis	540	3.7
Obstructive chronic bronchitis with acute exacerbation	452	3.1
Bronchiectasis with acute exacerbation	214	1.5