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 Chronic bronchitis →
section notes
491.2 Obstructive chronic bronchitis →
section notes
491.20   Obst chr bronc w/o exac
491.21   Obs chr bronc w(ac) exac
491.22   Obs chr bronc w ac bronc
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