Department Endocrinology, Diabetes and Metabolism
Primary Location Twinsburg Family Health & Surgery Center
Type of Doctor Adults Only
Languages English
Surgeon No
Twinsburg Family Health & Surgery Center
Primary Location

Twinsburg Family Health & Surgery Center


Additional Locations

Specialties & Treatments

Treatment & Services

  • Blood Tests
  • Bone Density Testing
  • Fine Needle Aspiration
  • General Endocrinology
  • Radioactive Iodine Treatment
  • Thyroid Aspiration
  • Thyroid Ultrasound
  • Thyroid Ultrasound And Biopsy
View all 8 Treatment & Services +

Specialty in Diseases & Conditions

  • Acromegaly
  • Adrenal disorders
  • Adrenal insufficiency
  • Androgen Deficiency (Low Testosterone)
  • Androgen Excess
  • Beta-cell disorders
  • Bone Disorders
  • Calcium Disorders
  • Carcinoid Syndrome
  • Cushing's Syndrome
  • Diabetes
  • Diabetes - Management
  • Diabetes, Gestational
  • Empty sella
  • Endocrine Complications of Pregnancy
  • Endocrine Disorders
  • Fasting hypoglycemia
  • Flushing Syndromes
  • Galactorrhea
  • Goiter
  • Growth hormone deficiency
  • Growth hormone excess
  • Gynecomastia
  • Hair Loss in Women
  • High Cholesterol
  • Hirsutism
  • Hyperaldosteronism
  • Hyperandrogenism
  • Hypercalcemia
  • Hyperparathyroidism
  • Hyperprolactinemia
  • Hyperthyroidism
  • Hypertriglyceridemia
  • Hypocalcemia
  • Hypogonadism
  • Hypoparathyroidism
  • Hypophysitis
  • Hypopituitarism
  • Hypothyroidism
  • Klinefelter Syndrome
  • Male Infertility Testing
  • Metabolic Bone Disease
  • Metabolic Diseases
  • Metabolic Syndrome
  • Osteopenia
  • Osteoporosis
  • Panhypopituitarism
  • Parathyroid Disease Description
  • Pheochromocytoma
  • Pituitary Cysts
  • Pituitary Disorders
  • Pituitary stalk lesions
  • Pituitary Tumors
  • Polycystic Ovary Syndrome
  • Primary Hyperaldosteronism
  • Prolactin Excess States
  • Prolactinoma
  • Pseudohypoparathyroidism
  • Reactive hypoglycemia
  • Secondary Hyperparathyroidism
  • Tertiary hyperparathyroidism
  • Thyroid and pregnancy
  • Thyroid Cancer
  • Thyroid Disease
  • Thyroid Nodule
  • Vitamin D Deficiency
View all 66 Specialties +


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About Guy Mulligan, MD

Dr. Guy Mulligan has been appointed as Associate Staff in Endocrinology, Diabetes and Metabolism as of July 2010.  Dr. Mulligan graduated from medical school at the University of Toledo, Ohio in 2005.  He completed his medical residency at the University of Michigan, Ann Arbor, Michigan, in 2008.  He completed his fellowship training in endocrinology at the Cleveland Clinic, Cleveland, Ohio in 2010.  He participated in clinical research during his endocrinology fellowship in the areas of vitamin D therapy and inferior petrosal sinus sampling in the diagnosis of ACTH-dependent Cushing's syndrome.  He enjoys evaluating and treating a wide variety of problems within the field of endocrinology, diabetes and metabolism.
Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - Cleveland Clinic
Cleveland, OH USA

Residency - University of Michigan Health System
Internal Medicine
Ann Arbor, MI USA

Medical School - University of Toledo College of Medicine
Toledo, OH USA

Undergraduate - College of Wooster
Wooster, OH USA


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

Specialty Interests

Type 2 diabetes mellitus, insulin resistance/pre-diabetes/PCOS, hyperthyroidism, thyroid nodules, primary hyperparathyroidism, hypothyroidism in pregnancy, male hypogonadism, pituitary adenoma, hyperprolactinemia, osteoporosis

Research & Publications

Research & Publications

See publications for Guy Mulligan, 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 11/25/2016, Dr. Mulligan 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

307 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 4.9
Listens 5
Courtesy, Respect & Concern 5
Knows Medical History 4.8
Time Spent with Patient 5
Patient Rating of Doctor 4.8

21 Patient Comments

Reviewed on Jul 6, 2017

Very caring, concerned about you in the hole scheme of illnesses and medications.

Reviewed on Jun 8, 2017

Dr. Mulligan has an exceptional bedside manner and was more than willing to take the time to discuss my concerns in detail. thank you Dr. Mulligan

Reviewed on May 24, 2017


Reviewed on May 24, 2017


Reviewed on May 16, 2017

Dr Mulligan always asks for input and together we develop a treatment plan. He always goes over the instructions and provides a written copy of the instruction, in large print which is very helpful. He's great.

Reviewed on Apr 26, 2017


Reviewed on Mar 2, 2017

Dr. Mulligan is a great communicator. He provides understandable answers to my questions, listens thoughtfully to my concerns, and engages me in developing a plan for ongoing care.

Reviewed on Feb 2, 2017

Best Dr's visit ever very helpful and understanding, really concerned about trying to figure out my problems and going above and beyond my expectations

Reviewed on Jan 30, 2017

but I am a clinical dietitian, and Dr. Mulligan treats me as another professional. I suspect, however, he would be good at explaining things to a non-health care person.

Reviewed on Dec 23, 2016

I had to wait a while for Dr Mulligan, but he was unhurried and spent time talking to me about the reasons I was there and showed me online what the problems were.

Reviewed on Dec 22, 2016

Dr. Mulligan has, by far, exceeded my expections as an endocrinologist . He spends a good amount of time going over my test results, on how I have been feeling and any concerns or questions I have. Dr. Mulligan genuinely cares about his patients and spends as much time as needed to cover everything! I also really appreciate the fact that he allows me to be a part of my treatment. Over the past 8 years I have seen 3 other Endo's and he has been the most knowledgeable and professional.

Reviewed on Dec 22, 2016

Dr Mulligan is one of the most compassionate, caring and knowledgeable Drs I have ever been in contact with. I would recommend him to anyone who needed an Endocrinologist.

Reviewed on Nov 17, 2016

Dr was very concerned that I understood instructions and if I had any questions that he could help with answers.

Reviewed on Nov 16, 2016

wonderful doctor

Reviewed on Nov 15, 2016

Dr. Mulligan is an excellent, caring doctor. My condition is complicated and, unlike certain other CCF physicians I have visited over the past several years, he is open-minded, patient and willing to look into new methods of treatment. Dr. Mulligan treats me with respect and sincerely tries to understand my medical issues and concerns. He is everything a physician should be.

Reviewed on Nov 4, 2016

Doctor was considerate of the cost of any changes to my medicines he suggested making; very important to a retiree.

Reviewed on Oct 24, 2016

Always very considerate..

Reviewed on Oct 5, 2016

I was overall very pleased with my visit with Dr. Mulligan as well with the Cleveland Clinic facility. So pleased that I even referred a family member to Dr. Mulligan.

Reviewed on Sep 23, 2016

I can say that they have very helpful to me.

Reviewed on Sep 13, 2016

Dr. Mulligan is a wonderful, caring and compassionate Doctor. He explains things well, listens to my concerns and tries very hard to help.

Reviewed on Sep 8, 2016

I have always felt completely involved in my health care as a patient of Dr. Mulligan. That's why I keep him as my doctor.

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