ICD-9-CM Vol. 1 Diagnostic Codes →
8. DISEASES OF THE RESPIRATORY SYSTEM (460-519) →
section notes
CHRONIC OBSTRUCTIVE PULMONARY DISEASE AND ALLIED CONDITIONS (490-496) →
section notes
491.0‑491.9   491 Chronic bronchitis
492.0‑492.8   492 Emphysema
493.00‑493.92   493 Asthma
494.0‑494.1   494 Bronchiectasis
490   Bronchitis NOS
495.0‑495.9   495 Extrinsic allergic alveolitis
496‑496   496 Chronic airway obstruction, not elsewhere classified
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