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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