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Siegfried, Jonathan S., MD, FACC, FSCAI





Providing the best care to our patients and their companions requires communicating in a way everyone understands. Interpreter services are available 24 hours a day, 7 days a week, 365 days a year. All spoken languages are available, as well as American Sign Language (AS/L).

Accepting New Patients
  • Interventional Cardiology
  • Echocardiography
Not Currently Accepting New Patients
  • Cardiovascular Medicine

Areas of Expertise
Hypertension, Non-Invasive Cardiovascular Medicine, Preventive Cardiology, Transradial PCI, Valvular Heart Disease


Lenox Hill Hospital

Medical School
New York University School of Medicine

New York University School of Medicine

Professional Organizations

  • American College of Cardiology, Fellow
  • Society for Cardiovascular Angiography and Interventions, Fellow


Verified Patient Reviews

5 out of 5 stars

Well placed and done in a timely manner.

5 out of 5 stars

I did recommend someone.

5 out of 5 stars

No waiting friendly staff

5 out of 5 stars

The doctor was great. I hadn't seen this doctor for a few years, yet he was still his usual kind & knowledgeable self. He was able to answer my random questions. He Also recommended devices that I could use to monitor my condition & to take steps if needed. I had never known about the abilities of one device, and never heard of the other device, so it was important that he told me about them and didn't just assume that I knew.

Other Reviews from Around the Web

5 out of 5 stars

Dr Siegfried is very relatable great in answering all my questions and easing any concerns. I feel fortunate to have been recommended to him and I know I will be in great hands with any future health concerns.


Aetna, Anthem, BCBS Medicare, CarePartners of Connecticut, Cigna Healthcare, Colonial Cooperative Care, Community Health Network of Connecticut, Inc., Connecticare, Connecticare Commercial, Connecticare Medicare, Corvel, Coventry, Essence Healthcare, Evercare, First Health Group Corp., Focus, Health Connecticut, Health Direct, Health New England, Healthy Connecticut, Multiplan, Northeast Health Direct, One Health Plan/ Great-West Healthcare, Oxford Health Plans, Prime Health Services, Private Health Care Systems, Inc., Senior Whole Health, United Healthcare, WellCare of Connecticut, Inc.

This information is subject to change at any time. Please check with your insurance provider before scheduling your appointment or receiving services to confirm they are a participating member of the Hartford HealthCare network.