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Cosin, Jonathan Aaron, MD, FACOG

Chief, Gynecologic Oncology, The Hospital of Central Connecticut





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
  • Gynecologic Oncology

Areas of Expertise
Cancer Clinical Trials, Cervical Cancer, Endometrial Cancer, Gestational Trophoblastic Disease, Gynecologic Cancer, Inherited Predisposition to Gynecologic Cancer, Minimally Invasive Surgery, Ovarian, Fallopian Tube and Primary Peritoneal Cancer, Robotic Surgery, Vaginal Cancer, Vulvar Cancer

Hospitals and Organizations

  • Hartford HealthCare Medical Group
  • The Hospital of Central Connecticut
  • Hartford Hospital
  • MidState Medical Center
  • Integrated Care Partners


University of Minnesota

Medical School
New York Medical College

Baystate Medical Center


Verified Patient Reviews

5 out of 5 stars

Dr. Cosin is always showing care, concern and thoroughness. I would always recommend him.

5 out of 5 stars

I trust Dr. Cosin, would recommend.

5 out of 5 stars

*Dr. Cosin explained "everything" in great detail. At the end, I had no questions.

5 out of 5 stars

Dr. Cosin is so smart and respected by the staff around him that one senses a strong team spirit. Dr. Cosin even held my hand prior to anesthesia. I Will always recommend Dr. Cosin and have. I will also recommend New Britain Hospital.

5 out of 5 stars

Having a cancer diagnosis is a life changing experience, but knowing that you have a caring, assuring, and experienced oncologist, the journey no longer has to be scary . *Dr. Cosin is probably one of the best doctors that I have seen!

5 out of 5 stars

I felt very comfortable with *Dr. Cosin's care. He explained everything very well and answered all my concerns & my surgery went well.

Other Reviews from Around the Web

5 out of 5 stars

Very good MD very professional and trustworthy ....

5 out of 5 stars

Dr. Cosin is a compassionate and just all around amazing human. He really listens to his patients and puts you at ease. His warmth and kindness makes him an incredible doctor and exactly who you want when faced with challenging health issues.

5 out of 5 stars

Dr. Cosin was information and straight forward about my diagnosis and what needs to be done about it. He's nice with a good sense of humor.

5 out of 5 stars

Was comforting and informative.


Dr. Cosin has been in practice for 18 years and serves as the leader of the Hartford HealthCare Cancer Institute’s Oncology Disease Management team. With special training in minimally invasive laparoscopic and robotic surgery, Dr. Cosin enjoys not only taking care of complex cases, but developing relationships with his patients, many of whom have followed him throughout the years.

He is active in teaching and clinical research, for which he has won numerous awards, and has volunteered his time for the last decade providing gynecologic care to the women of Grenada in the Caribbean.

In 2015, he received the William Petit, Jr. Award for his dedication to community service. He has also been named the following: a Newsweek Top Doctors for Cancer; Castle Connolly America’s Top Doctors for Cancer; and Hartford Magazine, Best Doctors.



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

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.