What is the rate of incidence for restrictive lung disease?

Restrictive lung disease is a term that can be applied to several types of specific lung conditions, so it is difficult to pinpoint exact incidence rates for the entire category. Pulmonary fibrosis, one of the common types of restrictive lung disease, affects as many as 200,000 Americans. The number of people in the United States struggling with any type of restrictive lung disease is likely much higher.