2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Chronic Obstructive Pulmonary Disease And Allied Conditions 490-496 > Chronic Bronchitis 491.* >  2008 ICD-9-CM Diagnosis 491.9
Unspecified chronic bronchitis On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date.
The 2009 version of ICD-9-CM 491.9 can be accessed here. - A subcategory of CHRONIC OBSTRUCTIVE PULMONARY DISEASE. The disease is characterized by hypersecretion of mucus accompanied by a chronic (more than 3 months in 2 consecutive years) productive cough. Infectious agents are a major cause of chronic bronchitis.
- 491.9 is a specific code that can be used to specify a diagnosis
- 491.9 contains 4 index entries
- View the ICD-9-CM Volume 1 491.* hierarchy
Index entries containing 491.9:- Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490
- chronic
 491.9 - senile 491.9
Peribronchitis 491.9- tuberculous (see also Tuberculosis) 011.3
Perichondritis- bronchus 491.9
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