Education
Medical:
Duke University School of Medicine
Residency:
UVA Health Medical Center
Fellowship:
University of Alabama Medical Center
Board Certifications
American Board of Internal Medicine - Nephrology
American Board of Internal Medicine - Internal Medicine
Locations
Riverside Renal Specialists Gloucester
7552 Hospital Drive, 302, Gloucester, VA 23061
Get Directions And Drive Time(804) 693-9062
Phone
(804) 693-9062Ratings & Reviews
Riverside Health is committed to exceptional quality, safety and service. All ratings and comments are obtained from patient survey data collected and verified by Press Ganey, an independent organization focused on improving patient experience. Star ratings are displayed for those physicians who participate in Riverside’s patient experience survey program through Press Ganey and have received a minimum of 30 surveys responses.
Overall Satisfaction
4.9
Based on 171 ratings
5 out of 5 stars
5 out of 5 stars
June 27, 2025
Best renal doctor whom always includes me in on any decision making and or treatments whom I have had the privilege of having as y nephrologist for over 33 years.
5 out of 5 stars
5 out of 5 stars
June 27, 2025
Dr. Gretes is a fantastic doctor. I don't want to see anyone else but I will have to when he retires.
5 out of 5 stars
5 out of 5 stars
June 21, 2025
Love Dr. Gretes; such a caring doctor who goes above beyond. So sorry he is retiring.
5 out of 5 stars
5 out of 5 stars
June 13, 2025
Helped settle my concerns and fears.
5 out of 5 stars
5 out of 5 stars
June 05, 2025
I was sad to learn my Doctor of many tears is retiring. I asked if he had a clone, but not. One of the nicest and caring doctors ever.
5 out of 5 stars
5 out of 5 stars
June 04, 2025
Dr Gretes has my complete confidence
5 out of 5 stars
5 out of 5 stars
May 31, 2025
Dr. Gretes took time explaining any questions I had.
5 out of 5 stars
5 out of 5 stars
May 23, 2025
Never felt rushed, I could tell the doctor really wanted to solve my concerns!
5 out of 5 stars
5 out of 5 stars
May 11, 2025
Dr Gretes always spends time explaining my results and answers all my questions. He makes me feel comfortable
5 out of 5 stars
5 out of 5 stars
April 25, 2025
I have been seeing Dr Gretes for years. He is an excellent physician who cares about his patients.
5 out of 5 stars
5 out of 5 stars
April 19, 2025
Dr Gretes is the best! Always caring, friendly, & informative
5 out of 5 stars
5 out of 5 stars
April 09, 2025
In all of my 73 years I have never had a Dr, better than John Gretes!!! [...]
5 out of 5 stars
5 out of 5 stars
April 06, 2025
Always enjoy because they make you feel good
5 out of 5 stars
5 out of 5 stars
April 04, 2025
Dr Gretes inspires trust and confidence. He is open to questions and discussion.
5 out of 5 stars
5 out of 5 stars
March 21, 2025
Dr. Gretes is exceptional
5 out of 5 stars
5 out of 5 stars
March 21, 2025
Dr. Gretes is the best doctor that I have ever had. He really takes the time to explain and make you feel like you are cared about. I am so sad that he will be retiring soon.
5 out of 5 stars
5 out of 5 stars
March 20, 2025
I have received treatment/ care from Dr. Gretes since the early 2000's. I credit him for stabilizing my symptoms and saving my life.
5 out of 5 stars
5 out of 5 stars
March 16, 2025
Dr GRETES has empathy and listens to your care concerns and your suggestions I feel we are a great team!
5 out of 5 stars
5 out of 5 stars
March 14, 2025
Dr. Gretes very caring. Walks you through all the options and listens to all your concerns
5 out of 5 stars
5 out of 5 stars
March 13, 2025
Dr. Gretes has been my doctor for 12years. I couldn't ask for a better doctor. He is kind , considerate and always very pleasant.He will talk to me as long as I need, to explain all of my conditions and treatment..