AHA Coding Clinic® for ICD-9 - 1988 Third Quarter

Acute Exacerbation of Chronic Obstructive Pulmonary Disease

Note: These coding guidelines were superseded by new guidelines published in Coding Clinic, Fourth Quarter, 1993. Chronic obstructive lung disease is a condition in which there is chronic obstruction to airflow due to chronic bronchitis and/or emphysema. Code 496, Chronic airway obstruction NEC, excludes chronic obstructive lung disease or COPD specified as obstructive chronic bronchitis (491.2), chronic asthmatic bronchitis (491.2), asthma with chronic obstruction (493.0-493.9), and emphysema (492.0-492.8). Since many patients rarely fall neatly into a single category and bronchitis and emphysema frequently coexist in the same patient, the diagnosis of Chronic obstructive...

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