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
493 Asthma →
section notes
493.2 Chronic obstructive asthma →
section notes
493.20   Chronic obst asthma NOS
493.21   Ch ob asthma w stat asth
493.22   Ch obst asth w (ac) exac
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