The ICD-9 code range PNEUMOCONIOSES AND OTHER LUNG DISEASES DUE TO EXTERNAL AGENTS for 500-508 is medical classification list by the World Health Organization (WHO).
Coal workers' pneumoconiosis
Pneumoconiosis due to other silica or silicates
Pneumoconiosis due to other inorganic dust
Pneumonopathy due to inhalation of other dust
Respiratory conditions due to chemical fumes and vapors
Pneumonitis due to solids and liquids
Respiratory conditions due to other and unspecified external agents