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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


University of Minnesota

Medical School
New York Medical College

Baystate Medical Center

Professional Organizations

  • American College of Obstetricians & Gynecologists
  • Society of Gynecologic Oncologists
  • American College of Surgeons
  • Gynecologic Oncology Group


Verified Patient Reviews

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.

5 out of 5 stars

*Dr. Cosin is a wonderful doctor and I'm blessed to have him as my provider.

5 out of 5 stars

Doc Cosin is an amazing caregiver! And I have told many friends about him and his extraordinary Team!

5 out of 5 stars

Excellent physician. He took the appropriate time to meet my needs and answer my questions.

5 out of 5 stars

I would highly recommend *Dr. Cosin. His experience and concern for his patients makes him a very exceptional doctor.

5 out of 5 stars

Great doc & staff.

5 out of 5 stars

*Dr. Cosin listened to my issues/concerns was very open about treatment and set up timely appt. to address my issues. Happy I was referred to him.

5 out of 5 stars

Have told many people about the fantastic doctors.

Other Reviews from Around the Web

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.

5 out of 5 stars

Love him he's the best I could ask for


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, CarePartners of Connecticut, Cigna Healthcare, Colonial Cooperative Care, Connecticare, Connecticare Commercial, Connecticare Medicare, Coventry, First Health Group Corp., 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., 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.