About
Dr. Antonios Katsigiannis has practiced internal medicine and primary care in Stamford, Connecticut for more than 20 years. He earned his undergraduate degree from Cornell University, College of Arts and Sciences, before completing his medical degree at New York Medical College in 1993. He then completed both his internship and internal medicine residency at Stamford Hospital, where he served as Chief Resident from 1995 to 1996. He holds dual board certification as a Diplomate of the American Board of Internal Medicine and a Diplomate of the National Board of Medical Examiners.
Dr. Katsigiannis maintains affiliations with Greenwich Hospital and makes social rounds at Stamford Hospital. He speaks English and Greek fluently, and he makes house calls for patients who cannot come to the office. His care philosophy centers on listening carefully and asking deeper questions. He believes that truly understanding a patient's health requires time, and he organizes his practice to give that time to every person he sees. Patients have trusted him for more than 25 years, and his recognition includes the Compassionate Doctor Recognition Award and the Patients' Choice Award, both in 2009. Outside medicine, he enjoys theater, cycling, swimming, music, travel, and watch and jewelry repair.
Education & Training
Undergraduate
Cornell University, College of Arts and Sciences, Ithaca, NY - Bachelor of Arts, Pre-Medical, 1988
Medical School
New York Medical College, Valhalla, NY - Doctorate of Medicine, 1993
Residency
Stamford Hospital, Stamford, CT - Internal Medicine Residency and Chief Residency, 1995-1996; Internship 1993-1994
Certifications
Languages
English, Greek
Conditions Treated
Who is Dr. Katsigiannis right for?
Dr. Katsigiannis is a strong fit for adults seeking a long-term primary care relationship with an experienced internist. Patients managing chronic conditions benefit from his thorough, unhurried approach and comprehensive annual screenings. Greek-speaking patients will find a physician who communicates fluently in their language. Those who need house calls or after-hours access will find both available through his practice.
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Frequently Asked Questions
Dr. Katsigiannis focuses on internal medicine and primary care for adults. He treats a broad range of conditions, including chronic disease management, cardiovascular risk, and metabolic health concerns. His annual Wellness Program identifies health risks early through comprehensive screenings and advanced diagnostic testing.
Yes. Dr. Katsigiannis holds dual board certification as a Diplomate of the American Board of Internal Medicine and a Diplomate of the National Board of Medical Examiners. He also maintains certifications in Advanced Cardiac Life Support and Basic Life Support.
Dr. Katsigiannis earned his undergraduate degree from Cornell University, College of Arts and Sciences. He completed his medical degree at New York Medical College in Valhalla, New York in 1993. He then completed both his internship and internal medicine residency at Stamford Hospital, where he served as Chief Resident from 1995 to 1996.
Dr. Katsigiannis has practiced internal medicine and primary care in Stamford, Connecticut for more than 20 years. Many of his patients have trusted him for more than 25 years, and he earned the Compassionate Doctor Recognition Award and the Patients' Choice Award in 2009.
Yes. Dr. Katsigiannis makes house calls for patients who cannot travel to the office. This service ensures that mobility or health limitations do not prevent patients from receiving care.
Yes. Dr. Katsigiannis speaks both English and Greek fluently. Greek-speaking patients can communicate with him directly in their preferred language during appointments.
Dr. Katsigiannis centers his care philosophy on careful listening and deeper questioning. He believes that truly understanding a patient's health requires time, so he structures every appointment to allow for thorough, unhurried conversation. His small panel size supports this approach.
Dr. Katsigiannis maintains an affiliation with Greenwich Hospital and makes social rounds at Stamford Hospital. These affiliations allow him to stay connected to hospital-based care when his patients need it.
Doctor profile last updated March 21, 2026