The number of cardiologists in the U.S.A, according to Hyperdrive Bio Voyager, is around 40,641 as of 2025. These physicians provided care to more than 51 million Medicare beneficiaries in 2023, based on Medicare Part B claims.
Cardiologist services are much in demand due to America’s most concerning health problem: heart disease. Cardiologists treat everybody young and old, and most people will see a one once or several times in their lives.
As the population ages and the numbers of elderly continue to grow, it makes sense for health systems, vendors, and public health officials to know how many cardiologists are actively practicing — and how many patients they serve.
With our software and expertise, we make it easier for you to market and connect with cardiologists in the United States.
How Many Cardiologists Are Practicing in the U.S.?
The American College of Cardiology itself says it has 49,000 members, all spread across U.S. hospitals, health systems, and outpatient clinics.
It is a number that is close to ours. However, note that Voyager’s data is sourced from the National Plan and Provider Enumeration System (NPPES) and the Centers for Medicare & Medicaid Services (CMS), and both are updated weekly.
Our sources provide real world billing data and truly confirms which and where cardiologists are actively providing care.
And, upon further browsing the software will show general cardiologists, as well as cardiology specialties including interventional cardiologists, electrophysiologists, nuclear cardiologists, and more.
Medicare Part B: Over 51 Million Patients Served in 2023
In 2023, Medicare data showed that U.S. cardiologists delivered care to over 51 million individuals. This includes services such as:
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Electrocardiograms and stress tests
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Prescribing medication and monitoring
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Interventions for common ailments such as heart failure and arrhythmia
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Providing outpatient care
More data from Voyager’s reveals that cardiologists are concentrated in major metro areas — including New York, Los Angeles, Houston, Boston — while rural regions continue to experience gaps in access.
Claims-Based Data is More Accurate
Traditional databases often include anyone ever licensed or certified as a cardiologist — even if they’ve retired or moved to non-clinical roles. Therefore, they don’t provide reliable data.
Having accurate and real-time data help organizations:
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Accurately map the active provider landscape
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Target referring physicians or proceduralists
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Understand regional capacity constraints
Voyager uses real-time claims data to track actual care delivery, where it is provided, and how many are providing services. The software also provides the number of cardiologists in U.S.A by region, so you can know which places to prioritize targeting.,
FAQs: How Many Cardiologists Are in the U.S.?
Q: How many cardiologists are actively practicing in the U.S.?
A: As of 2025, Voyager identifies 40,641 active cardiologists, based on billing and clinical activity.
Q: How many Medicare patients do they serve?
A: In 2023, cardiologists provided care to over 51 million Medicare Part B beneficiaries.
Q: Does this include all subspecialties?
A: Yes — general cardiology, electrophysiology, interventional cardiology, and advanced heart failure.
Q: Where does the data come from?
A: Voyager sources provider records from NPPES and CMS registries (updated weekly), and cross-verifies with medical claims.
Sources
American College of Cardiology. https://www.acc.org/
