The ICD-9 code range CHRONIC OBSTRUCTIVE PULMONARY DISEASE AND ALLIED CONDITIONS for 490-496 is medical classification list by the World Health Organization (WHO).
Chronic bronchitis
Obstructive chronic bronchitis
Asthma
Extrinsic asthma
Intrinsic asthma
Chronic obstructive asthma
Bronchiectasis
Extrinsic allergic alveolitis