AHA Coding Clinic® for ICD-9 - 2001 Fourth Quarter

Chronic Obstructive Asthma with Acute Exacerbation

Effective October 1, 2001, a new "excludes" note has been added to code 491.21, Chronic obstructive bronchitis with acute exacerbation, to exclude chronic obstructive asthma with acute exacerbation. 491 Chronic bronchitis 491.2 Obstructive chronic bronchitis 491.21 With acute exacerbation Add Excludes: chronic obstructive asthma with acute exacerbation (493.22) In addition, the fifth digit of "0" for use with category 493, Asthma, has been revised as follows: 493 Asthma The following fifth-digit subclassification is for use with category 493: Revise 0 without mention of status asthmaticus or acute exacerbation or unspecified ...

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