Department Endocrinology, Diabetes and Metabolism
Primary Location Cleveland Clinic Main Campus
Type of Doctor Both Adults and Children & Adolescents
Languages English
Surgeon No
Cleveland Clinic Main Campus
Primary Location

Cleveland Clinic Main Campus


Additional Locations

Specialties & Treatments

Treatment & Services

  • Adolescent Endocrinology
  • Diabetes Center
  • General Endocrinology
  • Medical Weight Management
  • Radioactive Iodine Treatment
  • Thyroid Aspiration
  • Thyroid Ultrasound
  • Thyroid Ultrasound And Biopsy
View all 8 Treatment & Services +

Specialty in Diseases & Conditions

  • Acromegaly
  • Addison's Disease
  • Adrenal disorders
  • Adrenal insufficiency
  • Adrenal Tumors
  • Adrenocortical Carcinoma
  • Adrenoleukodystrophy (ALD)
  • Alopecia Areata
  • Amenorrhea
  • Androgen Deficiency (Low Testosterone)
  • Androgen Excess
  • Beta-cell disorders
  • Bone Disorders
  • Calcium Disorders
  • Carcinoid Syndrome
  • Cardiovascular Risk Prevention
  • Conn's Syndrome
  • Cushing's Syndrome
  • Diabetes
  • Diabetes, Gestational
  • Erectile Dysfunction
  • Familial Multiple Endocrine Neoplasia
  • Fasting hypoglycemia
  • Flushing Syndromes
  • Galactorrhea
  • Goiter
  • Growth hormone deficiency
  • Growth hormone excess
  • Gynecomastia
  • Hair Loss
  • Hair Loss in Women
  • High Cholesterol
  • Hirsutism
  • Hyperaldosteronism
  • Hyperandrogenism
  • Hypercalcemia
  • Hyperprolactinemia
  • Hypertension - High Blood Pressure
  • Hyperthyroidism
  • Hypertriglyceridemia
  • Hypocalcemia
  • Hypogonadism
  • Hypoparathyroidism
  • Hypophysitis
  • Hypopituitarism
  • Hypothyroidism
  • Ketogenic Diet
  • Klinefelter Syndrome
  • Male Infertility Testing
  • Menopause, Male
  • Metabolic Diseases
  • Metabolic Syndrome
  • Neuropathy - Diabetic
  • Obesity
  • Osteopenia
  • Osteoporosis
  • Panhypopituitarism
  • Parathyroid Disease Description
  • Pheochromocytoma
  • Pituitary Disorders
  • Pituitary Tumors
  • Polycystic Ovary Syndrome
  • Primary Hyperaldosteronism
  • Prolactin Excess States
  • Prolactinoma
  • Pseudohypoparathyroidism
  • Reactive hypoglycemia
  • Secondary Hyperparathyroidism
  • Sexual Dysfunction
  • Sexual Hormone disorders
  • Tertiary hyperparathyroidism
  • Thyroid and pregnancy
  • Thyroid Cancer
  • Thyroid Disease
  • Thyroid Nodule
  • Vitamin D Deficiency
View all 76 Specialties +


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Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - Mayo Clinic
Rochester, MN USA

Residency - Duke University Medical Center
Internal Medicine
Durham, NC USA

Internship - Duke University Medical Center
Internal Medicine
Durham, NC USA

Medical Education - Johns Hopkins University School of Medicine
Baltimore, MD USA

Undergraduate - University of Michigan
Ann Arbor, MI USA


  • Internal Medicine
  • Internal Medicine - Endocrinology, Diabetes and Metabolism

Specialty Interests

Type I and Type II diabetes, adult growth hormone deficiency, hypothyroidism, hyperthyroidism, thyroid nodule, hypogonadism, pituitary adenoma, adrenal insufficiency, hypercalcemia

Research & Publications

Research & Publications

See publications for Robert Zimmerman, MD.

(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

Industry Relationships

Cleveland Clinic physicians and scientists may collaborate with the pharmaceutical or medical device industries to help develop medical breakthroughs or provide medical expertise or education. Cleveland Clinic strives to make scientific advances that will benefit patient care and support outside relationships that promise public benefit. In order for the discoveries of Cleveland Clinic physicians' and scientists' laboratories and investigations to benefit the public, these discoveries must be commercialized in partnership with industry. As experts in their fields, Cleveland Clinic physicians and scientists are often sought after by industry to consult, provide expertise and education.

To assure professional and commercial integrity in such matters, Cleveland Clinic maintains a program that reviews these collaborations and, when appropriate, puts measures in place to minimize bias that may result from ties to industry. Cleveland Clinic publicly discloses the names of companies when (i) its physicians/scientists receive $5,000 or more per year (or, in rare cases, equity or stock options) for speaking and consulting, (ii) its physicians/scientists serve as a fiduciary, (iii) its physicians/scientists receive or have the right to receive royalties or (iv) its physicians/ scientists hold any equity interest for the physician's/scientist's role as inventor, discoverer, developer, founder or consultant.* In publicly disclosing this information, Cleveland Clinic tries to provide information as accurately as possible about its physicians' and scientists' connections with industry.

As of 11/6/2020, 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.

Patient Satisfaction Reviews

169 Patient Satisfaction Reviews

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

Responses are measured on a scale of 1 to 5 with 5 being the best score.

The comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of Cleveland Clinic.

Overall Star Ratings
4.9 out of 5
Explains 4.8
Courtesy, Respect & Concern 4.9
Patient Rating of Doctor 4.9

41 Patient Comments

Reviewed on Dec 14, 2020

I am always completely satisfied when ever I have an appointment with Dr. Zimmerman.

Reviewed on Dec 14, 2020

Never ever have I had a bad experience when I have any appointment with Dr. Zimmerman and the entire staff.

Reviewed on Dec 1, 2020

I completely appreciate and value Dr. Zimmerman as a person and a professional. His influence motivates me daily to care for my diabetes and I fare well because of him. take good care of him.

Reviewed on Nov 20, 2020

Dr Zimmerman was curious and looking for a solution to my problem

Reviewed on Nov 13, 2020

dr. Zimmerman is amazing

Reviewed on Nov 13, 2020

Dr Zimmerman always listens . Highly recommend

Reviewed on Nov 12, 2020

In addition to his exceptional expertise in endocrinology, Dr Zimmerman is the most caring doctor I have ever worked with. He asks me questions and takes time to really listen and discuss problems and to explain treatments. I am very fortunate to be his patient. Thank you

Reviewed on Oct 23, 2020

Dr. Zimmerman is always concerned about the health of his patients.

Reviewed on Oct 6, 2020

He's a great doctor but I've been trying to solve a very complex issue and I don't know how to go about or even explain it correctly so I'm a problem but he's GREAT and everyone at the Cleveland Clinic is fantastic. That's why I tried because you are the best and I've seen hundreds of doctors here in PA with no satisfactory results and I'm just chasing my tail and I'll just continue on my path. I can confuse doctors by my home easier. I don't know what to do with my terrible feeling. It's has to be me. Maybe this is the best I'll be

Reviewed on Oct 5, 2020

dr Zimmerman is excellent

Reviewed on Sep 14, 2020

Dr Zimmerman is always attentive great listener great advice.

Reviewed on Sep 4, 2020

great doctor

Reviewed on Aug 31, 2020

Dr. Zimmerman could have not been more caring and knowledgeable. He was a very good listener and was able to frame the exact question I sometime was trying to explain. Truthfully, I have not had this kind of patient doctor interaction in a long time and it was so very helpful. I have and will recommend Dr. Zimmerman

Reviewed on Aug 31, 2020

Dr. Zimmerman is the best Endo dr. that I've had in 40 yrs. very polite, understanding, and intelligent! thank you Dr.

Reviewed on Aug 31, 2020

Dr.Zimmerman was amazing!

Reviewed on Aug 4, 2020

Our discussion exposed an opportunity for Dr. Z's staff to help patients prepare and make available required blood glucose data and charts from CGM devices before the appointment date/time. This would aid Dr. Z's staff and the patient in managing patient health.

Reviewed on Jul 29, 2020

I have always been impressed with the efficiency and care of Dr.Zimmerman and his staff.

Reviewed on Jul 21, 2020

I was very impressed with Dr Zimmerman. He took time and really listened to me.

Reviewed on Jul 17, 2020

dr Zimmerman listens carefully and very courteous. Explains treatment and lab results clearly.

Reviewed on Jul 14, 2020

This was our first visit and the Dr. was amazing with explaining, and being considerate of Marisa's feelings and having anxiety, and autism.

Reviewed on Jul 10, 2020

Dr zimmerman is awesome

Reviewed on Jun 25, 2020

my appointment with Dr. Zimmerman was very good he was very informing and acknowledging of my goals to lose weightHe did refer me to a dietitian

Reviewed on Jun 25, 2020

Dr. Zimmerman was very willing to discuss issues of my occasional very low and high sugar readings.

Reviewed on Jun 9, 2020

Dr. Zimmerman is always aware of my history and treats me both with professionalism and with concern.

Reviewed on Jun 1, 2020

Good. Dr. Z was very personable and attentive

Reviewed on May 20, 2020

Zimmerman is an awesome doctor. He never scares people and have a wonderful conversation while seeing the patient which makes patient feel comfortable. Being out of state I still want to get seen only by Zimmerman . I don't want to even switch my doctor . He is the best !

Reviewed on May 18, 2020

Dr Zimmerman has been very helpful thus far!!

Reviewed on May 18, 2020

DR Zimmerman's advice and plan of action has already made a positive impact on my health, as my tear results are beginning to improve!!

Reviewed on May 8, 2020

Have been a patient of Dr. Zimmerman for many years. We have always had a good rapport.

Reviewed on May 7, 2020

Great doctor

Reviewed on May 6, 2020

I have been a patient of Robert Zimmerman for years. He is a professional and does a professional's job. I would gladly and willingly recommend him to anyone in need of his services. I am fortunate that he is my doctor.

Reviewed on May 5, 2020

Dr Zimmerman is an amazing doctor. He influences my diabetes decisions for the good each day. 28 years if diabetes ad still going strong.

Reviewed on Apr 29, 2020

Dr. Zimmerman and his staff are THE best!

Reviewed on Apr 28, 2020

Dr. Zimmerman is courteous & takes the time to look at my endocrine system very thoroughly.

Reviewed on Mar 6, 2020

Dr. Robert Zimmerman was excellent.

Reviewed on Mar 2, 2020

Experience was very good. Dr Zimmerman and His assistant was very thorough and courteous with me.

Reviewed on Feb 14, 2020

I wish Dr. Zimmerman reviewed the side effects of the medication he prescribed me with more detail.

Reviewed on Jan 27, 2020

Dr. Zimmerman is very knowledgeable with any and all of my concerns and very detailed

Reviewed on Jan 27, 2020

This provider is very helpful to me and has been every step of my journey

Reviewed on Jan 3, 2020

great experience and super doctor

Reviewed on Jan 3, 2020

Dr. Z is the best care provider to date. He always interested in your health and any life changes. Not only do I think that he is a great physician but a great person.

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