Highlights
Age Groups Seen
- Adolescent
- Adult
Languages
- English
Gender
MaleLocations
- Cleveland Clinic Main Campus
- 9500 Euclid Avenue, Cleveland, OH 44195
- Get Directions
- X Building - Centers for Geriatric and Diabetes Care
- 10685 Carnegie Avenue, Suite 105, Cleveland, OH 44106
- Get Directions
Education & Board Certifications
Education
- Fellowship: Mayo Clinic, 1987
- Residency: Duke University Medical Center , 1984
- Internship: Duke University Medical Center , 1982
- Medical Education: Johns Hopkins University School of Medicine, 1981
- Undergraduate: University of Michigan, 1977
Board Certifications
- Endocrinology, Diabetes and Metabolism: American Board of Internal Medicine, 1987
- Internal Medicine: American Board of Internal Medicine, 1984
Research & Publications
See publications for this provider. (Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.)
Industry Relationships
Cleveland Clinic physicians and scientists collaborate with industry to advance medical breakthroughs. These partnerships help commercialize discoveries for public benefit while maintaining scientific integrity. To ensure transparency and minimize potential bias, Cleveland Clinic reviews these relationships and publicly discloses when physicians/scientists receive significant compensation for consulting, serve in fiduciary roles, receive royalties, or hold equity interests related to their work. We manage potential conflicts through approval processes, annual reporting, and targeted management plans.
As of 2025-04-29, Dr. Zimmerman has reported no financial relationship with industry that is applicable to this listing.
In general, patients should feel free to contact their doctor about any of the relationships and how the relationships are overseen by Cleveland Clinic. To learn more about Cleveland Clinic's policies on collaborations with industry and innovation management, go to our Integrity in Innovation page.
Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers' discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.
* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.
Insurances Accepted
Video
Ratings & Reviews
4.8 out of 5
193 ratings, 46 reviewsThe 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.
- 5 out of 5 starsReviewed on 4/13/2026
Dr.Zimmerman was very patient with my questions and concerns and did his best to make sure I was satisfied with his answers.
- 5 out of 5 starsReviewed on 4/13/2026
Dr. Zimmerman was professional, thorough, and made several helpful recommendations, along with creating a plan for the upcoming months.
- 5 out of 5 starsReviewed on 4/7/2026
Dr. Zimmerman is awesome. He''s always helpful and kind and of course very very knowledgeable.
- 5 out of 5 starsReviewed on 3/16/2026
Great Doctor
- 5 out of 5 starsReviewed on 2/23/2026
Dr. Zimmerman is excellent.
- 5 out of 5 starsReviewed on 2/6/2026
I trust Dr. Zimmerman throughout my husband and my own experience with him.
- 5 out of 5 starsReviewed on 2/3/2026
Excellent experience the doctor is always extremely efficient. Wonderful manners.
- 5 out of 5 starsReviewed on 2/3/2026
As good as face to face, I feel very doctored.
- 5 out of 5 starsReviewed on 2/3/2026
I see Dr. Zimmerman regularly for my condition. As always, he was extremely attentive and careful.
- 5 out of 5 starsReviewed on 2/3/2026
Dr. Z is the best.
- 5 out of 5 starsReviewed on 1/23/2026
I would definitely recommend Dr Zimmerman to family and friends.
- 2 out of 5 starsReviewed on 1/23/2026
CC staff are outstanding! It is only Dr Zimmerman that I am very disappointed with his care and interest in me , as his patient.
- 5 out of 5 starsReviewed on 1/13/2026
Dr. Zimmerman answers all my questions and I get good results.
- 5 out of 5 starsReviewed on 1/13/2026
Dr. Zimmerman is the best doctor I have had care for me in my 63 years
- 5 out of 5 starsReviewed on 12/24/2025
I couldn't be happier. Dr. Zimmerman's careful analysis, study and directives resulted in my ability to move forward with a simple daily vitamin D routine. I have confidence in Dr. Zimmerman.
- 5 out of 5 starsReviewed on 12/24/2025
I have a good relationship with Dr. Zimmerman
- 5 out of 5 starsReviewed on 12/4/2025
I would recommend Dr Zimmerman to anyone! He is a wonderful man.
- 5 out of 5 starsReviewed on 12/2/2025
Dr. Zimmerman was very attentive and took the time to discuss my health concerns on multiple levels.
- 5 out of 5 starsReviewed on 11/24/2025
Dr. Zimmerman was outstanding. He asked me questions, he heard me and was very kind.
- 5 out of 5 starsReviewed on 11/24/2025
Dr. Zimmerman and his staff are outstanding, kind, considerate and caring. I feel like I am heard.
- 5 out of 5 starsReviewed on 10/29/2025
Dr R. Zimmerman is very knowledgeable. Professional ,kind and compassionate. He involves me in my care, readily answers questions and offers suggestions and options to deal with problem areas. There is mutual respect; he is very caring.
- 5 out of 5 starsReviewed on 10/16/2025
Dr. Zimmerman went over my test results. Gave clear advice. Listened and answered my questions. Let me know that I can call if any questions or problems.
- 5 out of 5 starsReviewed on 9/26/2025
Dr. Zimmerman is very good at giving me explanations of why he suggests treatment options. Asks me if I am comfortable with those options.
- 4 out of 5 starsReviewed on 9/26/2025
Dr Zimmerman was not prepared for my visit.
- 5 out of 5 starsReviewed on 9/17/2025
Excellent provider
- 5 out of 5 starsReviewed on 7/22/2025
Dr. Zimmerman addresses my concerns. He focused on my questions and listened to my concerns. He gave clear input.
- 5 out of 5 starsReviewed on 7/8/2025
I am fortunate to have Dr Zimmerman as my endocrinologist. He is caring, knowledgeable and kind. He always helps me feel better and suggests new things to try for my conditions all along. Thank you Dr Z
- 5 out of 5 starsReviewed on 6/25/2025
The doctor went over every detail with me. Let me ask questions and was very kind and I felt heard and understand.
- 5 out of 5 starsReviewed on 6/25/2025
The physician is good responding when he gets the messages but his staff takes forever with a response.
- 5 out of 5 starsReviewed on 6/25/2025
Outstanding service at the reception to, the aid, to the nurse to the doctor. I felt heard and understood.
- 5 out of 5 starsReviewed on 6/24/2025
Good doctor.
- 5 out of 5 starsReviewed on 6/24/2025
I've never had to wait a substantial period of time after logging on for my visit with Dr. Zimmerman.
- 5 out of 5 starsReviewed on 6/24/2025
Dr. Zimmerman is always thorough and he listens to my concerns.
- 5 out of 5 starsReviewed on 6/24/2025
Dr. Zimmerman always gives great advice regarding my overall health.
- 5 out of 5 starsReviewed on 6/10/2025
He's always so.kind and open to my opinions and thoughts I always feel heard love him
- 5 out of 5 starsReviewed on 6/10/2025
My provider is usually very good listen to my problems and give me a good medicine.
- 5 out of 5 starsReviewed on 6/10/2025
He was very nice,explained everything to me,I think he is a good Doctor.
- 5 out of 5 starsReviewed on 5/27/2025
Always a good appointment Dr Zimmerman is kind and thorough.
- 5 out of 5 starsReviewed on 5/27/2025
Dr.Zimmerman is clearly an accomplished, experienced physician. He was thorough, took time to evaluate fully, explained clearly, answered questions completely, and was kind, respectful, patient and humble. A true professional in every sense.
- 5 out of 5 starsReviewed on 5/27/2025
I was very fortunate to have found Dr. Zimmerman! I'm very happy with his care and I would recommend him to others, and have.
- 5 out of 5 starsReviewed on 5/27/2025
Dr Zimmerman was happy I was 93% in range. I'm in range due to his treatment plan.
- 5 out of 5 starsReviewed on 5/27/2025
Dr Zimmerman is very encouraging
- 5 out of 5 starsReviewed on 5/13/2025
Dr. Zimmerman is kind, respectful, informative...does not rush through explanations, includes me in health care decision making....Highly recommend him.
- 5 out of 5 starsReviewed on 5/6/2025
I am so lucky to have Dr Zimmerman as my endocrinologist . He is very knowledgeable and kind. He makes me feel included in my care and always sticks with me on hard health problems to get them solved.
- 5 out of 5 starsReviewed on 5/6/2025
My visit with Dr Zimmerman went very well! Dr was very respectful and made me feel very welcomed. I would definitely recommend him to anyone looking for a new diabetes Dr or if you just were diagnosed with this disease.t[5
- 5 out of 5 starsReviewed on 5/6/2025
Dr Zimmerman is not only a top professional but he also cares about his patients as people. I appreciate him very much.