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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Article Overview
This article explains a small ICD-9-CM update affecting chronic obstructive bronchitis, chronic obstructive asthma, and the asthma category. It is relevant for coders working with diagnosis classification changes and effective-date updates from the early 2000s.
Why This Topic Matters
Even small diagnosis coding edits can affect code selection, edit checks, and reporting accuracy. This update helps coders and compliance teams recognize a category revision and an excludes note change tied to an effective date.
What You Will Learn
- What diagnosis coding change was introduced on the effective date noted in the article.
- How the article frames the relationship between chronic obstructive bronchitis and chronic obstructive asthma.
- What category-level asthma revision is mentioned in the update.
- Which diagnosis coding areas are affected by the change.
Who Should Read This
- Medical coders
- Coding auditors
- Compliance staff
- Clinical documentation improvement teams
- Billing professionals
Codes Discussed
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