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2007 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.* > 2007 ICD-9-CM Diagnosis 491.9 Unspecified chronic bronchitis This code may be outdated. View the most recent version of ICD-9-CM 491.9 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 with tracheitis (chronic) 491.8 asthmatic 493.2 catarrhal 491.0 chemical (due to fumes and vapors) 506.4 due to fumes or vapors (chemical) (inhalation) 506.4 radiation 508.8 tobacco smoking 491.0 mucopurulent 491.1 obstructive 491.20 with acute bronchitis 491.22 exacerbation (acute) 491.21 purulent 491.1 simple 491.0 specified type NEC 491.8 senile 491.9 Peribronchitis 491.9 tuberculous (see also Tuberculosis) 011.3 Perichondritis bronchus 491.9