AHA Coding Clinic® for ICD-9 - 1991 Fourth Quarter; New/Revised Codes

Acute Exacerbation of Chronic Obstructive Bronchitis

ICD-9-CM has been modified to provide for the coding of all acute exacerbation of chronic obstructive bronchitis. Acute exacerbation of chronic obstructive bronchitis is not the same as acute bronchitis and assigning code 466.0, Acute bronchitis, in this situation is incorrect. When the physician indicates an acute exacerbation of chronic obstructive bronchitis, the appropriate fifth digit must be applied as follows: 491.20 Obstructive chronic bronchitis without mention of acute exacerbation 491.21 Obstructive chronic bronchitis with acute exacerbation ...

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