In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere.". Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code.
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as N95.1.
The ICD code J30 is used to code Respiratory disease. Respiratory disease is a medical term that encompasses pathological conditions affecting the organs and tissues that make gas exchange possible in higher organisms, and includes conditions of the upper respiratory tract, trachea, bronchi, bronchioles, alveoli, pleura and pleural cavity, ...
This means that while there is no exact mapping between this ICD10 code J30.0 and a single ICD9 code, 477.9 is an approximate match for comparison and conversion purposes.
Micrograph of an emphysematous lung; emphysema is a common respiratory disease, strongly associated with smoking. H&E stain.