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Sinning, Joseph Garret, MD





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
  • Medical Oncology
  • Hematology / Oncology

Areas of Expertise
Breast Cancer, Gastrointestinal Cancer, Hematologic Malignancy

Hospitals and Organizations

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


Yale University School of Medicine ‐ Hematology and Medical Oncology
Stanford University School of Medicine ‐ Bone Marrow Transplantation

Naval Medical Center

Medical School
Columbia University College of Physicians & Surgeons

University of California ‐ Internal Medicine


Verified Patient Reviews

5 out of 5 stars

Dr. Sinning asks many questions so it makes it easy to explain how I am doing. He is excellent about explaining the options I have in my treatment.

5 out of 5 stars

Never rushed Dr took his time to answer all my questions and concerns and also explain his care plan for me.

5 out of 5 stars

*Dr. Sinning is a kind and compassionate physician. No concern is too small to discuss with him. He spends a lot of time with his patients unlike many providers today. I feel complete trust in him.

5 out of 5 stars

I've been going to Dr. Sinning every 6 months for about 3 years. He is always friendly and takes the time to talk with me, discuss any concerns I have or answer any questions. I would recommend Dr. Sinning to anyone.

5 out of 5 stars

Very thoughtful and caring.

5 out of 5 stars

He was very engaged in our conversation. He didn't make me feel like I was just another number he was very personable with me. We were talking about my family my job he was getting to know who I was. I would highly recommend him. He even walked me out to the front to make my next appointment.

5 out of 5 stars

Dr. Sinning was very thorough and informative.

4 out of 5 stars

I generally do not recommend providers. No changes in care needed or proposed at this time. #4. Nothing proposed.

Other Reviews from Around the Web

5 out of 5 stars

Dr. Sinning is the absolute best! He certainly saved my life! Kind, smart, compassionate and very caring. One of the best there is!

5 out of 5 stars

Great Dr, very caring, he takes his time and listens to your concerns.

5 out of 5 stars

Dr. Sinning is a physician, not a doctor. He carries the banner of the full aspect of a patient rather than being scientifically robotic. He took on my mother's care after her recent hospitalization and major blood loss. He met with us and put forward a plan to get her blood values up and to hopefully avoid transfusions. He himself empathizes and gives his own regards for his care of his own mother. I am thankful that he is taking care of my mother.

5 out of 5 stars

Dr sinning is an excellent Dr, he's carrying and very attentive. He talked me all the way through my treatments and gave me honest and open answers to all my questions. I would highly recommend him to anybody that has to go through what I'm going through.

5 out of 5 stars

Very professional office, great Doctor.

5 out of 5 stars

These people are the friendliest people on earth. Here to take care of you. Bless them for what they do

5 out of 5 stars

Dr. Sinning and his staff are highly competent and very empathetic. My condition has been correctly diagnosed and treated in a way that gives me and my family the assurance that we are in the best health care hands possible at this stage of my illness. Thank you all!


Joseph Sinning, MD, is a hematologist/oncologist with the Hartford HealthCare Cancer Institute, seeing patients in Plainville, Southington and Torrington.

Dr. Sinning served the greater Hartford and Waterbury communities in private practice and on the staff of St. Francis Hospital for years. His clinical interests include hematologic malignancies, general hematology and oncology, and breast cancer.

After earning a bachelor’s degree in biochemistry from Dartmouth College, he graduated from the Columbia University College of Physicians & Surgeons. He completed his internship and residency in internal medicine at the Naval Medical Center in Oakland, CA, and the University of California San Francisco, then went on to complete a pair of fellowships. One was in bone marrow transplantation at Stanford University School of Medicine, and the second was in hematology and medical oncology at Yale University School of Medicine.

Board-certified in medical oncology, hematology and internal medicine,Dr. Sinning is also an active researcher. He has served as sub-investigator in medical oncology and blood disorders with the Cooperative Group and Pharmaceutical Studies and has been named a Top Doctor by Connecticut Magazine for many years.


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