J99: Respiratory disorders in diseases classified elsewhere

J99.8: Respiratory disorders in other diseases classified elsewhere

When we breathe, the air gets into the body via the respiratory tract. The respiratory tract can be divided into the upper and the lower respiratory tracts. The nose and throat form part of the upper respiratory tract. The lower respiratory tract begins at the larynx. This includes the trachea and the bronchia.

You have a disease in your airways. The cause of the disease in your airways is another disease.