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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