Department Cardiovascular Medicine
Primary Location Cleveland Clinic Main Campus
Type of Doctor Adults Only
Languages English
Surgeon No
Cleveland Clinic Main Campus
Primary Location

Cleveland Clinic Main Campus

Specialties & Treatments

Treatment & Services

  • Aorta Center
  • Cardiovascular Medicine Department
  • Clinical Cardiology Section
  • Perioperative Cardiac Management
View all 4 Treatment & Services +


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About Donald Hammer, MD

Dr. Donald Hammer is Director of Cardiology Surgical Services and a staff cardiologist in the Section of Clinical Cardiology, the Robert and Suzanne Tomsich Department of Cardiovascular Medicine, at the Sydell and Arnold Miller Family Heart & Vascular Institute. He is board certified in internal medicine and cardiology. Dr. Hammer's specialty interests are ischemic heart disease and perioperative cardiac management.

Dr. Hammer graduated summa cum laude from Case Western Reserve University (Phi Beta Kappa) with an undergraduate degree in chemistry. He received his medical degree from The Ohio State University College of Medicine, in Columbus, Ohio, where he was inducted in the Alpha Omega Alpha honor society. He completed his clinical internship and residency in internal medicine at The Ohio State University Hospitals, where he went on to receive a fellowship in cardiology.

Dr. Hammer served 10 years in the United States Naval Corps and retired as a Lieutenant Commander, U.S. Naval Medical Corps. He has had multiple academic appointments, which include Clinical Instructor in Internal Medicine at The Ohio State University Hospitals; Director of Education, Internal Medicine at the Naval Regional Medical Center at Camp Pendleton, CA; Assistant Clinical Professor of Medicine and Associate Medical Director of the Cardiac Transplantation Program at The Ohio State University Hospitals; Education Coordinator for Cardiology at Wright State University in Dayton, OH, where he was also Director of the Cardiology Fellowship Training Program; Director of the Echocardiography Laboratory and Chairman of the Cardiology Research Panel at Good Samaritan Hospital in Dayton, among others. In 1998, Dr. Hammer was appointed to the Cleveland Clinic Foundation as Director of Cardiology Surgical Services.

Dr. Hammer has long been involved in clinical studies on his specialty interests and heart related issues. His post basic research endeavors included high-energy phosphate analysis in dilated cardiomyopathy and CHF. He currently is the principal investigator on a retrospective comparison of second and third generation beta blockers and post-operative atrial fibrillation prophylaxis, and is a co-investigator on the safety and efficacy in low molecular weight heparin in selected patients post open heart surgery. Dr. Hammer has participated in many other clinical trials including the QUIET STUDY and in the GUSTO trials.

He has presented his research findings and addressed his specialty interests at many national conferences and symposia. He is the author or co-author of articles related to his work in leading publications, including Circulation, Heart, and the New England Journal of Medicine, to name a few. In addition, he has co-authored a chapter on endogenous inotrope in a medical textbook on Cardiotonic Drugs.

Dr. Hammer is Fellow in the American College of Cardiology and a member of the American Medical Association, the American Society of Echocardiography and the Medical Society of Northeastern Ohio.

Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - The Ohio State University Hospitals
Columbus, OH USA

Residency - The Ohio State University Hospitals
Internal Medicine
Columbus, OH USA

Internship - The Ohio State University Hospitals
Internal Medicine
Columbus, OH USA

Medical School - The Ohio State University College of Medicine and Public Health
Columbus, OH USA

Undergraduate - Case Western Reserve University
Cleveland, OH USA


  • Internal Medicine
  • Internal Medicine - Cardiovascular Disease

Specialty Interests

General cardiology, heart disease, aorta disease, perioperative cardiac management

Research & Publications

Research & Publications

See publications for Donald Hammer, 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 5/24/2018, Dr. Hammer 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

285 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 4.9
Courtesy, Respect & Concern 4.9
Knows Medical History 4.9
Time Spent with Patient 4.9
Patient Rating of Doctor 4.8

43 Patient Comments

Reviewed on Nov 2, 2018

doctor took time to explain what was going on

Reviewed on Oct 18, 2018

i have never met a Physician who shows so much respect to a patient. an d this is to a patient who does not follow the doctor's orders to the detriment of his health. Dr. Hammer's care! It is worth the drive, back and forth to New Jersey to be under

Reviewed on Sep 25, 2018

Enjoyed discussing my medical options with Dr. Hammer. He was very clear and knowledgeable with respect to my medical treatment. There was collaboration with my surgeon, my primary cardiologist, and anesthesiologist. The reasons for concern was clearly explained to me, and my views considered. I believe that my knowledge of my own health issues with respect to my heart was integral in assuaging any concerns that my surgical team put forth..

Reviewed on Sep 24, 2018

I find Dr. Hammer to be a highly competent and a caring physician . the info he provided, the choices he laid out were essential information . I am grateful to Dr . Hanmer for his counsel and care.

Reviewed on Sep 24, 2018

Dr. Hammer was caring , attentive , and highly informative .

Reviewed on Sep 21, 2018


Reviewed on Sep 18, 2018

Dr Hammer is always prompt and professional

Reviewed on Aug 22, 2018

I can not say enough good things about Dr. Hammer...Hands down, Best Cardiologist I have ever seen!!! Wonderful Doctor, Man... wonderful experience to meet such a person...

Reviewed on Aug 16, 2018

Dr. Hammer has always spent plenty of quality time with me, answering questions, reviewing history.His office has always been helpful, too - scheduling, addressing medication concerns.

Reviewed on Aug 15, 2018

Dr. Hammer is the best doctor at the Cleveland Clinic and there are a lot of good doctors there.

Reviewed on Aug 14, 2018

This appointment was my first with Dr Hammer, and I feel he was very knowledgeable, spent more time with me than I expected, and was very easy to talk with. I believe he is a great doctor.

Reviewed on Aug 14, 2018

I believe Dr Hammer was very thorough in comering adjustments to our medicines and he thought through our return appointments in making his decisions.

Reviewed on Aug 14, 2018

had another great experience with dr. hammer. always spends the amount of time and then some to ensure that i understand what is going on with my health.

Reviewed on Aug 14, 2018

dr hammer goes out of his way to make sure that i have the best counsel available on what i am going through with afib. clearly something i know little about.

Reviewed on Aug 9, 2018

Dr. Hammer is an excellent provider.

Reviewed on Aug 9, 2018

Dr. Hammer is an excellent provider

Reviewed on Aug 9, 2018

every year I travel 1200 miles and spend several hundred dollars on travel and hotels so that I can continue to see Dr. Hammer... he is that good!

Reviewed on Aug 9, 2018

xDr Hammer is the best. The Cleveland Clinic is the best. When I came to the clinic I had very poor quality of life. Today I had a 73 in the heat and humidity. Prior to the clinic I probably wouldn't have gone outside.

Reviewed on Aug 6, 2018

Dr Hammer was very knowledgeable of the heart. Thanks you.

Reviewed on Jul 31, 2018

Dr. Hammer is an exceptionally skilled and caring physician.

Reviewed on Jul 5, 2018

Excellent experience with Doctor Hammer. I value the ability to meet a Doctor so capable, so thorough and so commited to helping you achieve a long life. He is the best doctor that I have been associated with and I have had many Doctors in a number of practices over my lifetime.

Reviewed on Jul 5, 2018

As I have already cited Dr. Hammer is the most committed doctor I have experienced and I have had quite a few in my lifetime.. No one will spend the time and commitment as Dr. Hammer. He will take calls at home at any time if you need him.

Reviewed on Jul 5, 2018

I believe Dr.Hammer is directly involved and should get credit for extending my life.

Reviewed on Jul 5, 2018

The staff follows the leadership of Dr Hammer and is commited to exceptional service.

Reviewed on Jun 29, 2018

Dr Hammer is an excellent physician in every aspect! We feel so at ease working with him.

Reviewed on Jun 28, 2018

Dr. Hammer was about 30 minutes late, but spent an hour with us to answer all questions and review test results from earlier in the morning. He does a great job, caring and wants to spend the right amount of time. My condition is with my heart, so I want him to spend the right amount of time.

Reviewed on Jun 25, 2018

I'm from out of town and was assigned to Dr. Hammer. I never made appts. or talked to anyone on the phone.

Reviewed on Jun 20, 2018

I find Dr. Hammer's manner condescending and he tends to speak softly and mumble even after being asked to speak up. Irritating.

Reviewed on Jun 4, 2018

I come prepared to my appointments by providing the physician with a brief, typed outline of my health concerns and a list of questions I would like answered. Dr. Hammer gives no consideration to this process. He does not have the information I provided and does not listen to my concerns. He has his mind made up without consideration of my views. I rarely get any questions answered, its frustrating that I walk away from my appointment with little direction. He is very kind and very concerned about my health. However, I want to be an equal partner in my health care with him so I can treat my issues with intelligent neglect.

Reviewed on May 31, 2018

Dr. Hammer was exceptionally thorough. He He soent a good deal of time explaining my test results as well as reviewing all my medication

Reviewed on May 24, 2018

We were told that we may have to wait until Dr. Hammer completed his rounds and reviewed my records. We were so happy that he would see us on such a short notice. Wait time was completely not a concern.

Reviewed on May 24, 2018

provider was 90 minutes late

Reviewed on May 23, 2018

I was under the impression that the doctor was going to get back to me about starting on cholesterol medicine. I did not hear back from him.

Reviewed on May 18, 2018

Dr. Hammer and his staff are always courteous and take their time. They squeezed me in appropriately and made several follow up appointments. Dr. Hammer is thorough and an excellent clinician. I trust him completely. I am a physician also.

Reviewed on May 3, 2018

Dr. Hammer is simply the best. He always takes the time review test results, plan of care, and any medications that I am taking. He certainly cares about his patients. Dr. Hammer has helped me through 2 heart operations and is doing everything possible to make sure that another operation is a remote possibility.

Reviewed on Apr 26, 2018

Dr. Hammer has always taken the time to discuss my health conditions and the solutions to the various conditions with understanding of my limited medical knowledge and continues to make them understandable to me.

Reviewed on Apr 16, 2018

Dr Hammer was extraordinary in his cardiology expertise and judgement. He spent the time with me so that I could understand my cardiology problem and the alternatives for care. This is why I came to the Cleveland Clinic in the first place and it did not disappoint. I came for the extra level of expertise.

Reviewed on Jan 30, 2018

Dr Hammer is an exceptional physician. I would recommend him without qualification to my other physician colleagues. A Dr's, Dr.

Reviewed on Jan 30, 2018

well coordinated & professional

Reviewed on Jan 29, 2018

All good. Dr. Hammer is well qualified and direct, a joy to work with.

Reviewed on Jan 10, 2018

Love Dr. Hammer! So patient with me and all my questions!

Reviewed on Dec 18, 2017

Dr. Hammer is an excellent provider. He is helpful and includes me in all decisions. I would not mind having a long wait for him, although there was no wait.

Reviewed on Dec 18, 2017

Dr. Hammer is always on top of things when I arrive for an appointment. With all my issues & questions he assesses every last detail even having all his patients, he makes you seem very important. He always make sure I have an appointment follow-up before I leave the Clinic which makes it so convenient for patients not having to call for future visits.

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