J95: Postprocedural respiratory disorders, not elsewhere classified

J95.3: Chronic pulmonary insufficiency following surgery

The lungs are on the left and right side of the ribcage. They are also connected to the nose and mouth via the bronchial tubes and windpipe (trachea). 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.

You were operated on. Your lungs have no longer been working properly for a considerable time. That has occurred after the operation. Your lungs have thus not been absorbing enough oxygen for a considerable time. As a result, you have less oxygen in your blood than normal.