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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 Imaging
  • Cardiovascular Imaging Section
  • Cardiovascular Medicine
  • Cardiovascular Medicine Department
  • General Cardiology
  • Heart Imaging
  • Hypertrophic Cardiomyopathy Center
  • Non-Invasive Diagnostic Testing
  • Pericardial Diseases Center
  • Stress Testing
View all 11 Treatment & Services +

Specialty in Diseases & Conditions

  • Amyloidosis
  • Aneurysms
  • Angina
  • Aorta Disease
  • Aortic Aneurysms
  • Aortic Occlusion (blockage)
  • Aortic Regurgitation
  • Aortic Stenosis
  • Atherosclerosis (vascular)
  • Atrial Septal Defects
  • Cardiovascular Disease
  • Cardiovascular Risk Prevention
  • Congenital Valve Disease
  • Coronary Artery Disease
  • Ehlers-Danlos Syndrome
  • Endocarditis
  • Heart Attack
  • Heart Disease
  • Heart Murmur
  • Heart Related Illnesses
  • Heart Valve Disease
  • Heart Valve Infections
  • High Cholesterol
  • Hypertension - High Blood Pressure
  • Hypertrophic Cardiomyopathy
  • Marfan Syndrome
  • Mitral Valve Prolapse
  • Mitral Valve Regurgitation
  • Mitral Valve Stenosis
  • Myxomas
  • Pericardial Cyst
  • Pericardial Disease
  • Pericardial Effusion
  • Pericarditis
  • Pulmonary Valve Disease
  • Pulmonary Valve Stenosis
  • Restrictive Cardiomyopathy
  • Rheumatic Heart Disease
  • Thoracic Aortic Aneurysm
  • Tricuspid Valve Disease
View all 40 Specialties +


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About Maran Thamilarasan, MD

Maran Thamilarasan, MD, is a staff cardiologist in the Section of Cardiovascular Imaging, the Robert and Suzanne Tomsich Department of Cardiovascular Medicine, at the Sydell and Arnold Miller Family Heart, Vascular & Thoracic Institute. Board-certified as a Diplomate in cardiovascular disease, Dr. Thamilarasan also is certified Diplomate by the National Board of Medical Examiners. He is also certified by the National Board of Echocardiography. He has focused his specialty interests on echocardiography, valvular heart disease, hypertrophic cardiomyopathy, diseases of the aorta and coronary artery disease.

A native of India, Dr. Thamilarasan grew up in the United States. He did his undergraduate work in biomedical sciences and political science at the University of Michigan at Ann Arbor, graduating with Highest Distinction and inducted into Phi Beta Kappa. As an undergraduate, Dr. Thamilarasan received the James B. Angell Scholar Award and the Regents-Alumni Scholarship Award. He continued on at the University of Michigan to receive his medical degree, graduating cum laude. He was inducted into the Alpha Omega Alpha Medical Honor Society, and received the American Society of Clinical Pathologist's Award.

Dr. Thamilarasan did his internship and residency in internal medicine at the University of Michigan Medical Center. Cleveland Clinic awarded him a fellowship in cardiology followed by an advanced fellowship in cardiac imaging. He has been with the Cleveland Clinic since 1995.

He has authored or co-authored chapters in medical textbooks on mitral valve disease, thrombolytic therapy and transesophageal echocardiography, among others. He has published articles and abstracts on his specialty interests in peer-reviewed publications such as Circulation, American Heart Journal, and the American Journal of Cardiology. He has presented his clinical experiences and abstracts at courses sponsored by the American College of Cardiology and the American Society of Echocardiography.

Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - Cleveland Clinic
Advanced Cardiac Imaging
Cleveland, OH USA

Fellowship - Cleveland Clinic
Cleveland, OH USA

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

Medical Education - University of Michigan Medical School
Ann Arbor, MI USA

Additional Training

  • Master's of Science, clinical research design and statistical analysis, University of Michigan, 2005


  • Internal Medicine - Cardiovascular Disease

Specialty Interests

Heart Valve Disease, Hypertrophic Cardiomyopathy, Marfan Syndrome, Pericardial Disease, Pericarditis, Thoracic Aortic Aneurysm, Cardiovascular Imaging, Echocardiogram, Non-Invasive Diagnostic Testing

Research & Publications

Research & Publications

See publications for Maran Thamilarasan, 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 3/29/2021, Dr. Thamilarasan 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

281 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 4.5
Courtesy, Respect & Concern 5
Patient Rating of Doctor 5

80 Patient Comments

Reviewed on May 25, 2021

Barbara, Jen, and Dr. Thamilarasan and his staff are outstanding

Reviewed on May 21, 2021

Very Bad!!! Was not told anything about having a covid test before I was allowed to take my yearly stress echo!!!!! So I came all the way from Louisiana, spent a lot of money and two days of my life not to get a full check up! Also I did not get my yearly blood test results that I expected. I do appreciate deeply the time I spent with the Doctor!!

Reviewed on May 18, 2021

He by far is the best physician I have ever had.

Reviewed on May 14, 2021

I appreciate the excellent care and advice DR. Thamilarasan has given me over the years. He continues to have a sincere interest in my well being. He has a calming presence and when I ask questions clarifies the information I'm seeking. Thank you to him!

Reviewed on May 14, 2021

Ah, I really dislike the term "Provider" He's a great DOCTOR!

Reviewed on May 11, 2021

Dr. T is amazing!

Reviewed on Apr 30, 2021

I am so blessed to have Dr. Thamilarasan as my cardiologist. He is very kind, friendly, spends enough time to answer the questions I have. He provides exceptional care!!!

Reviewed on Apr 27, 2021

I was so happy to see Dr Thamilarison. I reach out to him for everything that comes up and I follow his orders above any heart drs I have in Louisville. He is the man.

Reviewed on Apr 9, 2021

Dr easy to understand and caring

Reviewed on Mar 30, 2021

Very very pleased with my entire appointment and test! Dr.. Tham was great!!

Reviewed on Mar 19, 2021

My experience with Dr Thamilarasan was one of the best clinical experiences to date. The staff in the echo lab and exercise testing lab were also excellent.

Reviewed on Mar 19, 2021

Dr. Thamilarasan always takes the time to explain things and to listen to me. I feel that I am under very good care with him.

Reviewed on Mar 16, 2021

Care provider listened the question/worries and explained in detail and provided the proposed treatment. Surely I will recommend this care provider to friends and family.

Reviewed on Mar 16, 2021

The doctor was excellent!

Reviewed on Mar 16, 2021

Doctor took his time & explained options

Reviewed on Feb 26, 2021

Dr. Thamilarasan was the perfect doctor for me. His kindness, patience & temperament put me at ease. He took time to answer my questions and explain about my condition in great detail.

Reviewed on Feb 26, 2021

I very much appreciated a short notice appointment that included important tests as well as Dr. Thamilarasan's thoroughness.

Reviewed on Feb 26, 2021

Dr. Thamilarasan clearly explains both conditions and treatment options. I have a high degree of trust in him as well as the support teaim that provides him with test information so quickly and efficiently.

Reviewed on Feb 12, 2021

very Happy with Dr Thamilarasan care

Reviewed on Jan 29, 2021

I travel from Erie PA. with cooperation from your schedulers I am able to see two Doctors, ECCO, EKG and have a device check. Very efficient way to accomplish all of this. This is not the first time either many times in the past.

Reviewed on Jan 29, 2021

Dr. Thamilarasan is a wonderful doctor! I am very thankful that he's one of my health care providers.

Reviewed on Jan 29, 2021

Dr. Thamilarason is excellent. Staff around him caring and knowledgeable. MRI folks were really good too!

Reviewed on Jan 26, 2021

Dr. Thamilasrasan was very pleasant to talk to and answered any questions I had very well so I understood. I have never had an unpleasant experience at the Cleveland clinic. It is the most efficient medical facility I have ever been to.

Reviewed on Jan 22, 2021

good appointment, felt very comfortable asking questions to Dr Thamilarasan

Reviewed on Jan 19, 2021

Dr was so kind and took his time to listen.

Reviewed on Jan 12, 2021

my doctor is an exceptional physician

Reviewed on Dec 29, 2020

I recommend Dr. Thamilarisan to ask if my family and friends who have heart problems. In my opinion, he is the best cardiologist I've ever seen.

Reviewed on Dec 22, 2020

This was my 1st time with Dr. Thamilarasan. He was so kind and made me feel very comfortable. I felt confident that he was extremely knowledgeable about my condition.

Reviewed on Dec 22, 2020

Doctor Thamalarasan is one of the very kindest doctors we have yet to meet. A knowledgeable professional who was able to answer questions, explore thoroughly issues and responded in lightening fast time.

Reviewed on Dec 4, 2020

came with a list of questions, every question answered and explained. One issue was concerning to me the doctor took time to explain and calmed my thoughts.

Reviewed on Nov 24, 2020

The doctor answered every question we had and spent plenty of time with us explaining everything. We never felt rushed.

Reviewed on Nov 20, 2020

This is the best Dr. ..very caring and listens and responds to all my questions ...

Reviewed on Nov 13, 2020

Doctor very knowledgeable and caring.

Reviewed on Nov 13, 2020

I have the best Dr.

Reviewed on Nov 13, 2020

very friendly and efficient staff and doctor

Reviewed on Oct 27, 2020

Dr. Thamilarison is so much knowledge about this type of surgery and keeps abreast of this technology so well that he is the doctor that puts together the team for my valve replacement operation that he thinks may take place next year. What I love most about him is that he explains everything to me with no prompting from me. He is a true professional that cares about his patients.

Reviewed on Oct 23, 2020

extremely happy with the doctor. i feel as though I am in the best care possible

Reviewed on Oct 20, 2020

Dr Thamilarison is very through and methodical. We talked through each of my issues. He reviewed the course of action with me twice to be sure I understood and agreed how to address everything. I felt so relieved when I left!

Reviewed on Oct 20, 2020

it often takes several months to get an appointment, but well worth it. I love the Cleveland clinic Main campus. The most knowledgeable and compassionate physicians

Reviewed on Oct 20, 2020

Dr. Thamilarasan MD is a wonderful doctor to ask doctor and he makes me feel very comfortable.

Reviewed on Oct 16, 2020

I was disappointed by the explanation of my problem and the treatment options. I am still suffering. I'm hoping the physician contacts me with some more information after checking my labs. I came to the Cleveland clinic for help with my cardiology problem but they didn't seem to understand the etiology.

Reviewed on Oct 2, 2020

Dr. Thamilarasan is always friendly & professional. He did a great job of explaining & actually showing me on a model the particular heart problem I have.

Reviewed on Oct 2, 2020

Dr. was very kind and knowledgeable

Reviewed on Oct 2, 2020

Dr. L_____ was my doctor I've seen for years. It was hard getting into him. I found out, finally he retired. He WILL BE MISSED!

Reviewed on Oct 2, 2020

*Dr. Thamilarasan is now my doctor for HCM & he is excellent.

Reviewed on Sep 22, 2020

I was very happy with Dr Tham, he took time, he listened and was very good at explaining and was happy to answer any questions. This was my first experience with him and I walked away very happy and confident that I would be well taken care of!

Reviewed on Sep 22, 2020

Dr. Thamilarasan is a fantastic doctor. He is one of the main reasons I continue to come to the Cleveland Clinic for my heart check ups.

Reviewed on Sep 22, 2020

dr. T was very through. I had lots of questions about my condition and he answered them all.

Reviewed on Sep 15, 2020

I like this doctor

Reviewed on Sep 11, 2020

Dr. Thamilarason was fantastic. He listened, very sincere and I felt that he treated me like family. He is a unique, great asset to Cleveland Clinic.

Reviewed on Sep 8, 2020

In addition to being a very competent doctor, Dr. Thamilarason is a very kind and gentle man. He takes the time to explain everything and answer questions. He makes me feel very comfortable during my visit.

Reviewed on Sep 8, 2020

Dr. Thamilarasan was very kind and extremely helpful. He listened to my concerns and questions.

Reviewed on Sep 4, 2020

Both my wife and I are Dr Thamilarasan's patients. we really appreciate the fact that when you call his office someone ACTUALLY answers the phone!! This is very important. we can't stand when you get a message " we will call you back in 36 hrs". This has never happened with the Clinic.Dr Thamilarasan has been very good about getting back to us!

Reviewed on Sep 4, 2020

Dr.Thamilarasan is a wonderful doctor whom I trust completely.

Reviewed on Sep 4, 2020

Dr. Thamilarasan is a wonderful doctor. I trust him completely.

Reviewed on Sep 1, 2020

Dr Thamilarasan is very good, sharp, answers all questions directly, I am very satisfied, and after 12 years with Dr Lever- I was nervous about getting a new Dr.

Reviewed on Aug 28, 2020

I am amazed at how organized everything works. I can only say positive things about staff and my doctor. He is very caring and showed his concern.

Reviewed on Aug 28, 2020

My doctor was absolutely the best!!! Both times I have seen him, he was fantastic, showed concern, worked with my providers here in PA, discussed plan of action and made things happen. ..

Reviewed on Aug 21, 2020

was very impressed with Dr.

Reviewed on Aug 18, 2020

I have been going to this Doctor for thirteen years. I've never had any problems. Always a pleasant experience

Reviewed on Aug 18, 2020

I look forward to my annual visit with this doctor. He is a great caring individual.

Reviewed on Aug 18, 2020

For the past 12 years I have been a patient and Dr. Thamilarasan has been a highly competent and trustworthy cardiologist. I trust his analysis and recommendations for treatment.

Reviewed on Aug 11, 2020

doctor answered every question I had. great dr!

Reviewed on Aug 11, 2020

I have great respect for Dr. Thamilarasan he has been my primary cardiologist for many years. He is understanding, thoughtful, and honest. He has always demonstrated great dialog with me as a patient while taking the time to offer advise. The Cleveland Clinic should be proud to have him as one of their top notch Cardiologists.

Reviewed on Jul 31, 2020

He's great--an absolutely first-class doctor!

Reviewed on Jul 24, 2020

Wonderful Dr listens and is very proactive

Reviewed on Jul 21, 2020

This very knowledgeable cardiologist reviewed my medical history for a scheduled Septal Myectomy with Dr Smedira on July 24th.

Reviewed on Jul 17, 2020

Dr. Thamilarasan is the absolute best! he does it ALL at a very high level!

Reviewed on Jul 17, 2020

Dr. Thamilarasan is the best doctor I've ever had! he is caring, respectful and understanding. Truly the best!

Reviewed on Jul 14, 2020

excellent doctor

Reviewed on Jul 14, 2020

I would definitely recommend the Dr. i have had many doctors and he is number one with me. .

Reviewed on Jul 10, 2020

*Dr. Tham is always calm & patiently answers all of my questions. He is reassuring, thorough & professional & respectful.

Reviewed on Jul 10, 2020

Dr. Thamularison is always excellent in his care and guidance with a honest and caring approach.

Reviewed on Jul 7, 2020

Dr. Tharmalarson, is amazing. He answered questions I had not thought too ask. He presented in a way that was reassuring and eased my anxiety.Truly one of the good ones. I am truly grateful of the Cleveland Clinic.

Reviewed on Jun 23, 2020

Dr T is fantastic.

Reviewed on Jun 19, 2020

Dr Thamilarsan is an excellent doctor. He genuinely cares about his patients. He is caring and very helpful. He answers any questions respectfully even if it is a dumb question. He also includes your spouse in the conversations. He spends the necessary time and does not rush his patients.

Reviewed on Jun 19, 2020

Dr Thamilarasan is an exceptional Physician, he took quality time to answer all my questions in their entirety. Very compassionate, pleasant personality. Thanks to him and his staffs dedication to duty.

Reviewed on Jun 19, 2020

Fantastic way to consult with my provider, Dr Thamilarasan who is exceptional in every way.

Reviewed on Jun 16, 2020

I loved how they set everything up for one day then the dr adjusted according to your needs that day.

Reviewed on Jun 16, 2020

Dr T is a very caring, mild mannered physician whom I trust to handle my health issues.

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