
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Callahan, Cardiologist in Hyannis, MA?
Dr. Mary Callahan, DO is a Cardiologist, who primarily practices in Hyannis, MA. She is board certified. Dr. Callahan graduated from University of New England, Armidale and completed her residency at Albany Med Ctr Hosp, Cardiovascular Diseases; Roger Williams Hosp, Internal Medicine. Dr. Callahan is fluent in English, French, Italian, Japanese, and Spanish, and is currently seeing new patients. Dr. Callahan’s practice accepts Medicare, Cigna, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Callahan’s office.
What are Areas of Expertise for Dr. Callahan?
Dr. Mary Callahan, DO is a highly-rated, board-certified Cardiologist known for expertly diagnosing, treating, and managing a wide array of related conditions and procedures. Utilizing the latest medical advancements and evidence-based practices, Dr. Callahan empowers patients to confidently navigate their health journey, specializing in Atrial Fibrillation, Coronary Artery Disease, Hypertension-Complex, Pacemakers/Defibrillators, and comprehensive wellness support. Serving the Hyannis, MA community, Dr. Callahan is dedicated to enhancing lives through expert, patient-centered care.
Where did Dr. Callahan go to medical school and complete their residency?
Fellowship: Albany Medical Center, Fellow
Residency: Albany Med Ctr Hosp, Cardiovascular Diseases; Roger Williams Hosp, Internal Medicine | Brown University Affiliated Hospitals
Medical School: University of New England, Coll of Osteo Med, Biddeford Me | University of New England, Armidale
Is Dr. Callahan board certified as a Cardiologist?
Yes, Dr. Mary Callahan, DO is board certified by the American Board of Internal Medicine , American Board of Internal Medicine since 1997
What languages does Dr. Callahan speak?
Dr. Callahan and their clinical team can communicate with patients in the following languages:
English
French
Italian
Japanese
Spanish
What conditions does a Cardiologist like Dr. Callahan typically treat?
As a Cardiologist, Dr. Callahan diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Callahan. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology.
Also known as:
- Hardening of the Arteries in the Heart without Chest Pain
- Atherosclerosis
- Coronary Artery Disease
- Silent Coronary Artery Disease
- Asymptomatic Atherosclerosis
ICD-10 Codes:
- I2510: Atherosclerotic heart disease of native coronary artery without angina pectoris
Also known as:
- High Cholesterol
- Cholesterol
- Triglycerides
- Hyperlipidemia
- High lipids
- Dyslipidemia
ICD-10 Codes:
- E785: Hyperlipidemia, unspecified
What procedures does a Cardiologist like Dr. Callahan typically perform?
As a Cardiologist, procedures performed by Dr. Mary Callahan may include:
- Absent Pulmonary Valve Repair
- Anomalous Coronary Artery Angiography
- Anticoagulation Management
- Aortic Stenosis Repair
- Aortic Valve Repair / Replacement
- Aortopulmonary Window Repair
- Arterial Doppler
- Balloon Septostomy
Please contact Dr. Callahan's office directly to confirm care for your specific procedure, for more information, or to schedule a consultation.
Does Dr. Callahan accept my insurance?
Dr. Callahan accepts most major insurance plans. Important: Please call our office at before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Callahan accept in Hyannis, MA?
Dr. Callahan in Hyannis, MA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Blue Cross Blue Shield
Blue Cross Blue Shield of Illinois
Blue Cross Blue Shield of Massachusetts
Blue Cross Blue Shield of Michigan
CDPHP
Cigna Group
Elevance Health Inc. (formerly Anthem)
Medicare
State of Massachusetts
Unknown
View All Insurances
Where is Dr. Callahan's office located?
Recognitions
Awards
American College Of Physicians Presentation
Award
What is Dr. Callahan's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Callahan's National Provider Identifier (NPI) number is 1518968882.
What common questions do patients ask about Dr. Callahan?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Callahan
What is Dr. Mary Callahan's specialty?
Dr. Callahan is a Cardiologist near Hyannis, MA.
What does a Cardiologist do?
An internist specializing in cardiovascular diseases focuses on the diagnosis and management of complex heart and blood vessel conditions, including heart attacks and life-threatening arrhythmias.
Is this Dr. Mary Callahan affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Callahan is affiliated with Cape Cod Hospital which is a Castle Connolly Top Hospital. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
When to see a Cardiologist?: Guides for symptoms, conditions, and treatments
Understand your symptoms and know when it’s time to see a Cardiologist. Explore insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Mary Callahan accepting new patients in Hyannis, MA?
Yes, Dr. Mary Callahan is accepting new patients at this time.
Does Dr. Mary Callahan offer online booking?
Please contact Dr. Callahan's office for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Mary Callahan?
Please contact Dr. Callahan's office for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. Mary Callahan have?
Dr. Mary Callahan is certified by the American Board of Internal Medicine.
Other Cardiologist Near Hyannis, MA

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Dr. Garrick Stewart, MD is a Cardiologist, who primarily practices in Warwick, RI with 2 additional practice locations. He has been practicing for over 16 years.
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Dr. Adam Mohmand-Borkowski, MD is a Clinical Cardiac Electrophysiologist, who primarily practices in Hyannis, MA. He is board certified.
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Dr. Luke Daley, MD is a Cardiologist, who primarily practices in Hyannis, MA with 2 additional practice locations. He is board certified.
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Connect with DR. Callahan
25 Main St
Hyannis, MA 02601