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 School - 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 10/2/2018, Dr. Zimmerman has reported the financial relationships with the companies listed below. 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.

Consulting and/or Speaking. Dr. Zimmerman receives fees of $5,000 or more per year as a paid consultant, speaker or member of an advisory committee for the following companies:

  • Merck & Co., Inc.

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

122 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
4.8 out of 5
Explains 4.8
Listens 4.8
Courtesy, Respect & Concern 4.8
Knows Medical History 4.7
Time Spent with Patient 4.8
Patient Rating of Doctor 4.8

15 Patient Comments

Reviewed on Mar 18, 2019

My Husband just love DR. Zimmerman and his staff!! :) They are always always pleasant!

Reviewed on Feb 26, 2019

Dr. Zimmerman always takes time to review my most recent blood work results, compare with previous results, and make suggestions.

Reviewed on Feb 20, 2019

doctor is excellent and very helpful

Reviewed on Feb 13, 2019

Excellent Doctor. cares about patients. Great listener. Went over and above to work with me on several issues.

Reviewed on Dec 13, 2018

dr asked lots of wuestions but is a poor listener. He is excellent at obective parameters in looking at my health but a physician who seems to ask the wuestions because he is supposed to. there was no follow up including when he asked about depression, mood. Not sure I will continue seeing him.

Reviewed on Dec 3, 2018

When I was there I had to wait a while. Even Dr. Zimmerman walked out and waived as he didn't have any other patients and was just waiting on me. For some reason even though he wasn't busy I still had to wait in the lobby for I think a good 15 to 20 minutes, neither of us understood why.

Reviewed on Oct 25, 2018

he did not talk much. Incomplet esnetences and I really never got any clear structured information from him. I am eduacted and i trained physician myslef so i thanfully didi not need him eto explain anything. But he should have talked to me. He sat there talking to himself.

Reviewed on Oct 9, 2018

doctor called with results and personally instructed the following procedures

Reviewed on Oct 2, 2018

My experience was excellent. Dr. Zimmerman is a most caring physician and treated me with respect and gave me the confidence I needed concerning my diagnosis.

Reviewed on Sep 18, 2018

Only problem is they didnt have records that we mailed a month before. Webrought copies and Dr Zimmerman read and used them often.

Reviewed on Sep 18, 2018

We left so excited that Dr Zimmerman understood problem and acted sincere about helping.

Reviewed on Jun 8, 2018

Dr Zimmerman is the best specialist provider we have ever had in a long history of visiting specialists due to various auto immune disorders. He is extraordinarily patient and kind and understanding as well as being professional and extremely knowledgeable. He takes time to ask real questions (not the fake kind that some doctors ask just to seem nice ) and is very persistent in getting to the bottom of problems. He is also great at explaining medical issues in an understandable way. He cares about me as a patient and as a whole person. He works hard and gets back to us on my chart questions right away even though it seems this means he must stay late most days because he replies at the end of the day. We are very thankful for Dr Zimmerman and his work.

Reviewed on Jun 8, 2018

Dr Zimmerman explains everything so well - understandable but never condescending. A rare combination in our experience with many many specialists. He is the best! Also he always makes us laugh no matter how sick I have been. :)

Reviewed on Jun 8, 2018

We see Dr Zimmerman in two different locations. Sometimes it seems his nursing staff do not care to help him. They really don't pay attention to the chart when we are checking in , they are just going through steps. They also never keep track of lab results that get faxed to Dr Zimmerman and he has to go hunt for them himself or call the lab to get them. They just don't seem as committed to the patients as Dr Zimmerman always is.

Reviewed on May 15, 2018

I feel truly blessed to have Dr. Zimmerman as my doctor, he is an example of world class care. I would referred him to the world.

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