Pulmonary Alveolar Proteinosis (PAP) is a rare lung disorder characterized by the accumulation of abnormal proteins in the alveoli, impairing gas exchange. The ICD-10 code for PAP is J84.89, which falls under the category of "Other specified interstitial lung diseases."
In the ICD-9 code system, Pulmonary Alveolar Proteinosis is classified under 516.8, which represents "Other specified alveolar and parietoalveolar pneumonopathies."