AHA Coding Clinic® for ICD-9 - 2011 Issue 4; VOLUMES 1 & 2 NEW/REVISED CODES
Hypertrophic Cardiomyopathy
Effective October 1, 2011, new codes have been created to identify hypertrophic cardiomyopathy: 425.11, Hypertrophic obstructive cardiomyopathy, and 425.18, Other hypertrophic cardiomyopathy. Prior to this change, code 425.1 was used for hypertrophic obstructive cardiomyopathy; and nonobstructive, or that not described as obstructive, was indexed to 425.4, Other primary cardiomyopathies. Code 425.1 has been restructured as a subcategory and hypertrophic cardiomyopathy not specified as obstructive has been moved to this subcategory, giving it a new code. Hypertrophic cardiomyopathy (HCM) is a condition in which the heart muscle becomes thick without any obvious cause. HCM is...
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Article Overview
This article explains the 2011 ICD-9-CM updates related to hypertrophic cardiomyopathy and reviews the condition’s clinical background, including obstructive and nonobstructive forms. It is useful for coders, CDI staff, and clinical teams who need to understand the scope of the diagnosis update, the affected code family, and the surrounding terminology used to classify the condition.
Why This Topic Matters
Hypertrophic cardiomyopathy is a clinically important diagnosis with coding changes that affect how records are classified and reported. Understanding the affected code family helps support accurate documentation review and diagnosis coding during the transition period.
Article Sections
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Effective October 1, 2011, code updates
Introduces the diagnosis code changes that took effect on October 1, 2011 and identifies the affected cardiomyopathy categories.
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Clinical background: hypertrophic cardiomyopathy
Summarizes the condition’s general clinical features, inheritance pattern, and broad presentation patterns relevant to documentation and classification.
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ICD-9-CM code revisions
Outlines the restructuring of the hypertrophic cardiomyopathy diagnosis family and the associated revisions within the broader cardiomyopathy category.
What You Will Learn
- How hypertrophic cardiomyopathy is described clinically in the article
- What changed in the diagnosis code structure effective October 1, 2011
- How the article frames obstructive versus nonobstructive presentation categories
- Which broader cardiomyopathy category was revised along with the hypertrophic cardiomyopathy subcategory
Who Should Read This
- Medical coders
- Clinical documentation improvement specialists
- Coding educators
- Cardiology practices
- Revenue cycle teams
Codes Discussed
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