I28: Other diseases of pulmonary vessels

I28.9: Disease of pulmonary vessels, unspecified

You need lungs to breath. When we breathe in, oxygen enters the lungs and accumulates in the blood. This blood then flows to the heart. The heart then pumps the oxygen-rich blood throughout the body. All of the organs are supplied with oxygen as a result. Blood vessels in your lungs have changed. The blood vessels may be narrowed or injured, for example.