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 usually inherited and it is well-known as a leading cause of sudden cardiac death in young athletes. Younger people are more likely to have a more severe form of hypertrophic cardiomyopathy. HCM is frequently asymptomatic until sudden cardiac death. HCM can have two levels of manifestation, obstructive (obstructs the outflow of blood from the left ventricle of the heart) or nonobstructive. Whether or not it is obstructive can impact the need for different medical or surgical treatments.
425 Cardiomyopathy Revise 425.1 Hypertrophic
obstructivecardiomyopathy Delete Hypertrophic subaortic stenosis (idiopathic)Add Excludes: ventricular hypertrophy (429.3) New code 425.11 Hypertrophic obstructive cardiomyopathy Hypertrophic subaortic stenosis (idiopathic) New code 425.18 Other hypertrophic cardiomyopathy Nonobstructive hypertrophic cardiomyopathy 425.4 Other primary cardiomyopathies Cardiomyopathy: Delete hypertrophicDelete nonobstructive