Hypertrophic Cardiomyopathy

Hypertrophic Cardiomyopathy is indexed under Cardiovascular, Cardiomyopathy. Also known as HCM, HOCM, hypertrophic obstructive cardiomyopathy.

US prevalence

~1 in 500 (estimated 600,000+); many undiagnosed Source: AHA; ACC/AHA HCM Guidelines 2020. This figure comes from a professional society, registry, or study rather than a federal source. Label: REPORTED.

ICD-10-CM codes

I42.1, I42.2

Typical onset

Any age; often diagnosed in adolescence/young adulthood or later in life

Course

lifelong

Body systems

cardiovascular

Sex differences

Diagnosed more often in men; women may be underdiagnosed

Racial and ethnic differences

Black patients may present with more severe phenotype

What this page does not establish

These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.

Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.

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