Mary Callahan, DO, FACC
Cardiology • Sandwich, MA
Information from public sources; not independently verified. Confirm hours, insurance and appointment availability with the clinic.
Last gathered July 11, 2026. How our information is sourced · Report incorrect information
About
Mary Callahan, DO, FACC practices cardiology at Cardiovascular Associates of Sandwich in Sandwich, MA. She offers general cardiology, arrhythmia, syncope, cardiac devices, heart failure, women's cardiovascular health, hypertension, lipid disorders, and preventative cardiology services.
Services Offered
Team
Insurance & Payment
Not published.
Languages Spoken
Not published.
FAQs
What is the full street address with ZIP code?
68 Route 6A, Sandwich, MA 02563
What is the contact phone number?
(774) 413-5457
Social Media
Photos
Photos published by Mary Callahan, DO, FACC showing the cardiology practice in Sandwich, MA.
What Patients Say
Overall sentiment across review platforms: mixed
- Birdeye: 4.1 out of 5 stars (12 reviews)
- WebMD Care: 3 out of 5 stars (2 ratings with 1 review)
Patients praise
- Dr. Callahan is described as wonderful, thorough, respectful, and professional
- Patients appreciate her clear, detailed explanations and reassuring manner
- High performance rating (90.8/100) from the Centers for Medicare & Medicaid Services (CMS)
Common complaints
- Complaints regarding office staff, specifically the office manager/secretary being rude and unprofessional
- Occasional concerns regarding billing and office focus on finances
"Dr. Callahan was wonderful and respectful to him... She and her staff have been very supportive, thorough and kind."
- Birdeye Review"The office manager Tonya is extremely rude and unprofessional. Heard great things about Dr. Callahan but Tonya is ruining the practice."
- Birdeye/WebMD Review"This practice does not have any concern with people’s health issues. All they are concerned about is money."
- Birdeye ReviewSynthesized from public review platforms as of Jul 11, 2026 - sources: [1][2][3][4].
In the News
- Mary H. Calahan, NP - Nurse Practitioner in Prescott, AZ - May 14, 2026
- Mary Louise Callahan Obituary Feb 17, 2026 - Donaldson Funeral Home of Clarksville, P.A. - Feb 19, 2026
- Dr. Mary Callis, MD, Family Physician | Belvidere, IL | WebMD - Jan 15, 2026
- Dr. Samantha S Kapphahn, DO - Green Bay, WI - Cardiology, Interventional Cardiology, Vascular Medicine - Mar 12, 2026
- Rischio “bolla” nel settore dell’intelligenza artificiale? Il parere di Mary Callahan Erdoes di JPMorgan Chase – LMF – LaMiaFinanza - Oct 29, 2025
Information sourced from the clinic's website as of July 11, 2026.
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