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
491.20491.22   491.2 Obstructive chronic bronchitis
491.0   Simple chr bronchitis
491.1   Mucopurul chr bronchitis
491.8   Chronic bronchitis NEC
491.9   Chronic bronchitis NOS
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