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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
Not Currently Accepting New Patients
  • Internal Medicine

Areas of Expertise
Breast Cancer, Gastrointestinal Cancer, Hematologic Malignancy


Stanford University School of Medicine
Yale University School of Medicine

Naval Medical Center

Medical School
Columbia University College of Physicians & Surgeons

Naval Medical Center
University of California


Verified Patient Reviews

5 out of 5 stars

Dr Sinning was very compassionate and listened to my concerns. He offered a different medication for ongoing cancer protection. He is knowledgeable and provided answers to any questions I had. He helped to orchestrate my radiation in Plainville with Dr Mani to alleviate my traveling. I am appreciative of his efforts and responsiveness. It made my treatment and appointments much easier to manage.

5 out of 5 stars

*Dr. Sinning is wonderful and I have been his patient since 2007!

5 out of 5 stars

Dr. Sinning is awesome never rushes me and is very thorough with all explanations and answers to all my concerns.

5 out of 5 stars

Jane is hard of hearing. She had a difficult time understanding doctor. Doctor is excellent, but very soft spoken. Just the way it goes sometimes.

5 out of 5 stars

Dr Sinning explained what was going on and the treatment process. Very clear, great teacher. He actually listened to me and my concerns.

5 out of 5 stars

Constantly recommending *Dr. Sinning to friends and neighbors. Just wish *Dr. Sinning would come back to Torrington. Plainville is bit of a drive. Especially in bad weather.

5 out of 5 stars

Dr Sinning was excellent. He really took his time during our appointment and ensured all my questions were answered.

Other Reviews from Around the Web

5 out of 5 stars

Dr. Sinning is kind, knowledgeable and generous with his time. He makes every effort to answer all questions and make you comfortable. Highly recommend.

5 out of 5 stars

Dr. Sinning was very professional and thorough.

5 out of 5 stars

Awesome! Entire staff from Dr Sinnings, to nurses rn's,medical assistants, entire chemo infusion center including their volunteers!

5 out of 5 stars

Great medical treatment! Very caring staff.

5 out of 5 stars

Very friendly clean office.


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, 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, Harvard Pilgrim, 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.