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 Education - 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

312 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 4.8
Time Spent with Patient 4.9
Patient Rating of Doctor 4.8

58 Patient Comments

Reviewed on Jul 1, 2019

Dr Hammer is very good at explaining my heart condition, long term prognosis and options.

Reviewed on Jun 26, 2019

Dr. Hammer was determined to find the cause of my heart trouble. In no time at all he had my blod pressure under control and my heart pumping better. i found him to be a kind and compassionate doctor.

Reviewed on Jun 26, 2019

I wish all the doctors I deal with and have dealt with could be like doctor Hammer but I know that is impossible. He actually makes me feel like he is concerned and cares about me and my well being.

Reviewed on Jun 19, 2019

great doctor

Reviewed on Jun 14, 2019

Dr. Hammer is a joy to meet with. He's also very pleasant, informative, knowledgeable, and genuinely concerned. Plus, he really takes the time to get to know you. At the morning of our day at the Clinic, we spent some time in the bookstore at main campus. Dr. Hammer was there, and he saw us before we saw him, and he walked over to us, said hello and talked briefly, and knew what time our appointment with him was in the afternoon. He truly cares for his patients.

Reviewed on Jun 3, 2019

Even though all of the above were "Very Good", the appointment went badly when Dr. Hammer found out that the tests he had wanted done were not even scheduled. Fortunately we were staying at a friends house in Cleveland and I was able to come back the following day and avoid a two hour drive to get the test he wanted done. Furthermore, I really enjoy and appreciate Dr. Hammer's demeanor and personality, and he followed up on the botched visit in a very professional way. Dr. Hammer is "A-#1" in my book. rrc

Reviewed on May 30, 2019

Dr. Hammer is the best. He literally saved my life. I couldn't be happier with a Doctor.

Reviewed on May 30, 2019

I always speak highly of my care from Dr. Hammer and the Cleveland Clinic.

Reviewed on May 22, 2019

Dr. Hammer was very nice and comfortable to talk to. He listened and cared about what my concerns were. I will definitely see him again and refer him to others

Reviewed on May 22, 2019

Dr. Hammer is an excellent cardiologist and has a great personality in the office. He answered all of my and my wife's questions concisely. When I came to the clinic two months ago, I wasn't sure what could be done to correct my heart issues. Dr. Hammer provided me with realistic expectations and gave me peace of mind about my upcoming procedures and surgery. I wish I lived closer to the clinic.

Reviewed on May 16, 2019

Dr Hammer - the greatest cardiologist on the planet !

Reviewed on May 8, 2019

Dr. Hammer took his time talking to me and was very thoughtful on his answers. So far very impressed!

Reviewed on Mar 28, 2019

very knowledgeable in outcome analysis and as a Doctor is able to translate research and my clinical test results into actionable plans for my ultimate benefit. Felt very confident in all Dr Hammer's decisions concerning my needs for long term care of my arteries and heart.

Reviewed on Mar 28, 2019

the Cleveland Clinic heart is ranked number 1 due to its excellent staff and Dr Hammer is a great example of the quality of care provided by this hospital.

Reviewed on Mar 7, 2019

i love that Doctor Hammer up front honest and caring doctor

Reviewed on Feb 28, 2019

I had an excellent experience with Dr. Hammer.

Reviewed on Feb 28, 2019

I would highly recommend Dr. Hammer to any prospective patient.

Reviewed on Feb 28, 2019

I couldn't be happier with Dr.Hammer. I'm sure he has saved my life. He will always be thought of with the highest respect.

Reviewed on Feb 28, 2019

As I said earlier. I will recommend Dr. Hammer and the Cleveland clinic to everyone when heart health issues are discussed.

Reviewed on Feb 15, 2019

I was impressed by how much time the Dr. spent with me.

Reviewed on Feb 14, 2019

Dr. Hammer was very professional answered all my questions in great detail . Dr. Hammer was very prompt and very very reliable . Dr. Hammer is a very excellent Dr. I would recommend him to my friends and fellow workers.

Reviewed on Feb 1, 2019

Dr. Hammer was caring empathetic and showed genuine interest in helping me. He was thoroughl in his history taking and examination and listened to my concerns. He impressed me as an excellent clinician.

Reviewed on Jan 22, 2019

Dr. Hammer continues to provide great health care. He is thorough and patient in his explanations and provides a personalized experience. He is always willing to take phone calls and follows up promptly on questions/concerns. I have complete confidence in him.

Reviewed on Jan 18, 2019

Appreciated the doctors candor and honesty regarding my healthcare concerns

Reviewed on Jan 15, 2019

Dr.Hammer is a awesome. He goes above and beyond to make sure you understand what is going on with you. He has always been responsive and personable with my children and family.

Reviewed on Jan 15, 2019

Resident & Dr Hammer very thorough in handling my questions, my replies. Thought they were very considerate, to say the least!

Reviewed on Jan 14, 2019

Dr. Hammer is very accessible, via phone or text message. Always response quickly.

Reviewed on Jan 11, 2019

I have been a patient of Dr.Hammer's for about 12years. he has always provided top notch care. He seeks workable solutions for medical situations.

Reviewed on Dec 21, 2018

Dr. Hammer was very pleasant and kind. He was very interesting and informative. I felt very comfortable with his care and trusted his ability to help me.

Reviewed on Dec 18, 2018

Lab work I get the day before because it is not ready when I see the doctor. This time we had to wait for echo results. in the old days I would come in at 7AM for labs and tests and see the doctor at 9:30AM and he would have the results for all tests. Not now!!! I drive in from Ann Arbor and have the additional expense of two nights hotel rooms.

Reviewed on Dec 18, 2018

I feel very fortunate to have Dr. Donald F. Hammer, M.D. as my Cardiologist. He spends much adequate time with me during my appointments and he definitely explains everything in detail not only in conversation but also drawing certain aspects of the heart and its blood vessels that are associated with it. I cannot relate to you how satisfied I am when I am finished with my appointment because Dr. Hammer has answered all my questions. Sincerely, Gary A. Kizzen

Reviewed on Dec 18, 2018

I cannot say enough about Dr. Hammer and his staff. Every step is efficient and runs like the expressions says, "Clockwork."

Reviewed on Dec 18, 2018

From the time that I arrived for my appointment, I was greeted in a very friendly manner. I was taken in to the examination room right around the exact time that my appointment was for. I was very happy with my Cardiology appointment, the staff and Dr. Hammer.

Reviewed on Nov 9, 2018

I understand the doctor is very busy and spends the time required to help each patient. I would rather wait for Dr Hammer than see another cardiologist.

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.

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