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Thomas C Gniadek

Thomas C Gniadek, MD

Endocrinology, Diabetes & Metabolism, Endocrinology, Internal Medicine

Provider Ratings

4.9 out of 5 (305 ratings)

Provider Groups

  • Trinity Health Of New England Medical Group

  • Trinity Health Of New England Care Alliance

Primary Contact

203-755-7711
Provider Groups

  • Trinity Health Of New England Medical Group

  • Trinity Health Of New England Care Alliance

Primary Contact
203-755-7711
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Services & Specialties

Areas of Specialization

  • Endocrinology
  • Endocrinology, Diabetes & Metabolism
  • Internal Medicine

Clinical Interests

Conditions Treated

  • Endocrinology, Diabetes & Metabolism
  • Diabetes
  • Diabetes and Endocrinology

Locations & Contact

Primary Location

Trinity Health Of New England Medical Group - Prospect Endocrinology

166 Waterbury Rd
Ste 202
Prospect, CT 06712

203-755-7711 View Details

Additional Resources

Education & Certifications

Education

Education:
Fairfield University (1972)

Education:
University of Connecticut (1976)

Internship:
Saint Mary's Hospital (1977)

Residency:
Saint Mary's Hospital (1979)

Fellowship:
University of Michigan Hospitals & Health Centers (1981)

Board Certifications

Endocrinology, Diabetes & Metabolism, Endocrinology, Diabetes and Metabolism, American Board of Internal Medicine Subspecialty (1981)

Internal Medicine, American Board of (1979)

Provider Groups

Trinity Health Of New England Medical Group

Trinity Health Of New England Care Alliance

Provider Ratings

The following ratings and reviews are based on verified feedback collected from independently administered patient experience surveys. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy. Learn More >

4.9 out of 5

(305 ratings)

The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

60 Reviews

02/19/2026

Wonderful doctor

01/29/2026

Dr.Gniadek is always listening to your questions and gives explanations that are easy to understand

01/29/2026

I’ve gone to Dr. Gniadek for more than 45 years and I’m always happy to see him.

01/22/2026

Always very professional, thoughtful and takes the time to explain things in laymanterminology.

01/22/2026

None at this time.

01/22/2026

He’s the best!!!

12/18/2025

Great

12/18/2025

Best Dr I’ve even seen. He explains everything so thoroughly to me despite questions that may seem unnecessary to ask.

12/04/2025

He is a totally kind and considerate person. He listens and offers solutions.

12/02/2025

Very positive experience.

11/20/2025

outstanding!

10/29/2025

He is amazing!

10/29/2025

DR. G. always answer my questions gives me great advise.

10/29/2025

He is an excellent doctor. Friendly, great communication, and very professional

10/22/2025

Wonderful

10/15/2025

D.Gnaidek is great about explaining things in layman's terms

09/17/2025

excellent doctor

08/21/2025

Excellent!

08/20/2025

Excellent

08/19/2025

My husband and I will miss Dr. Gniadek as our PCP. He has been our Provider for over 30 years. I’m thankful he will still continue to provide care for my endocrine health.

08/14/2025

He is a very caring Dr.

08/13/2025

A regular appointment with Dr. Gniadek.

08/13/2025

I have been a patient of Dr. Gniadek for over 50 years. Dr Gniadek is a true professional and an excellent doctor. He is very professional and explains medical information in laymen terms.

08/06/2025

Dr Gniadek is very knowledgeable and thorough.One of the few you employ, unlike the md inSt Marys er the night of 4/29/19 and ignored the fact I was having a stroke as I walked in began the stroke i n the hall-told them all night I was losing my left side.Not one MD came to me and tried the clot medicine 11 hrs waited for mri Now am dealing with the results of non treatment of stroke.I hate trinity-St Marys.I do have to deal with the Big Business as the dr I have are trustworthy.

08/05/2025

Dr. Gniadek is a fantastic doctor! Can’t say enough good things about him, would totally recommend!!

07/31/2025

Dr Gniadek has been my provider for over 10 years. Outstanding knowledge and understanding of my diabetes needs.

07/22/2025

Explained things very well. Excellent exam.

07/17/2025

Dr. Gniadek always takes his time to address all issues so as a patient I understand. This is rare today with other doctors. I feel blessed to have him.

07/16/2025

Dr Gniadek is the best Doctor I have ever had

07/16/2025

I will miss him terribly when he retires.

07/16/2025

I've been going to him for so long that I can't see going elsewhere. He's a great doctor!

07/16/2025

Always good to chat with Doctor Gniadek. His wealth of knowledge and practical advice are great attributes.

07/15/2025

He is always very knowledgeable and very professional and kind

07/15/2025

Doctor and staff are always excellent

07/10/2025

Very knowledgeable and caring person

07/10/2025

Keeps me updated on the latest diabetic equipment!!

07/10/2025

excellent

07/10/2025

I've been his patient for 30+ years. He has always treated me with respect and dignity, friendly and very thorough. I trust him completely because of this and he really knows his stuff.

07/09/2025

I think very highly of Dr. Gniadek. He is an incredible doctor,; highly knowledgeable and competent with an excellent bedside manner. He is simply the best!!

07/08/2025

Dr. Gniaidek engages in discussion with patient in order to assure that feel that they are truly a participant in their Plan of Care. It is empowering.

06/24/2025

It's a good office

06/19/2025

Great doctor

06/18/2025

Have been going to this doctor many years, would not consider any other

06/11/2025

Dr. G & his staff care about my health & help me stay healthy.

06/10/2025

Dr. Gniadek has been my endocrinologist since 2005. He always been the same friendly demeanor.

06/10/2025

Very easy to talk to and understand. Wealth of information.

06/04/2025

None at this time.

06/03/2025

Wonderful

05/27/2025

Dr G is the best!!!

05/27/2025

Dr Gniadek is excellent

05/22/2025

Hope Dr. G. does not retire.

05/21/2025

To Trinity: please be sure to renew Dr Gniadeks contract this fall, dedicated doctors are hard to find

05/21/2025

100% perfect

05/20/2025

Great doctor

05/14/2025

Very efficient office

05/13/2025

explains things very clearly

05/07/2025

He a wonderful Dr. Very caring.

05/07/2025

Excellent doctor and staff.

05/01/2025

Dr Gniadek is everything you want in a doctor..

05/01/2025

Great experience
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203-755-7711

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