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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Note:  The following article synopsis was NOT provided by the AHA. It was created by Find-A-Code/innoviHealth.

Article Overview

This short coding reference discusses an ICD-9-CM update involving chronic obstructive bronchitis and the documentation context for acute exacerbation. It is aimed at medical coders and billing staff who need to understand the scope of the change and the related diagnosis codes referenced in the guidance.

Why This Topic Matters

Articles like this help coders distinguish related respiratory diagnoses and recognize when an ICD-9-CM update affects code assignment for documented exacerbation language.

What You Will Learn

  • The ICD-9-CM topic addressed by the article
  • How the article frames the documentation context for chronic obstructive bronchitis
  • Which diagnosis codes are referenced in the discussion of this coding update
  • Why the article is relevant to coding and billing review

Who Should Read This

  • Medical coders
  • Coding auditors
  • Billing staff
  • Clinical documentation staff

Codes Discussed

  • ICD-9-CM: 466.0
  • ICD-9-CM: 491.20
  • ICD-9-CM: 491.21

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