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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 > ICD-9-CM Diagnosis 496 Chronic airway obstruction not elsewhere classified A disease of chronic diffuse irreversible airflow obstruction. Subcategories of COPD include CHRONIC BRONCHITIS and PULMONARY EMPHYSEMA. Acronym for Diffuse Obstructive Pulmonary Syndrome. 496 is a specific code that can be used to specify a diagnosis 496 contains 14 index entries