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Department Internal Medicine and Geriatrics
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



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About Daniel Sullivan, MD

Daniel Sullivan, MD, has an interest in Preventive Care and Wellness, as well asĀ in improving the quality of life for older adults.
Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Residency - Albany Medical Center
Internal Medicine
Albany, NY

Internship - Albany Medical Center
Internal Medicine
Albany, NY

Medical Education - New York Medical College
Valhalla, NY

Undergraduate - Williams College
Williamstown, MA


  • Internal Medicine

Specialty Interests

Primary care promotion as a career, wellness

Research & Publications

Research & Publications

See publications for Daniel Sullivan, 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 1/1/2024, Dr. Sullivan 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

274 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 4.8
Courtesy, Respect & Concern 4.9
Patient Rating of Doctor 4.9

109 Patient Comments

Reviewed on Jun 14, 2024

Good experience. Felt good after talking with Dr Sullivan

Reviewed on Jun 13, 2024

Dr Sullivan and rest of the crew was excellent

Reviewed on Jun 13, 2024

I am a patient of Cleveland Clinic in London wishing to transfer to Cleveland. It took numerous attempts to get an appointment. However, once I actually met Dr Sullivan, it has become much better.

Reviewed on Jun 13, 2024

Difficult to get first point of entry, but much better once I met Dr Sullivan.

Reviewed on Jun 7, 2024

Dr. Sullivan is probably the best physician I've ever seen. He was informative, an excellent listener, and extremely attentive. I needed blood tests and an xray. He personally walked me to the blood lab to have tests done. At the end of my visit he said he would receive the results personally and get back to me.I left the hospital at 6:00 PM and by 8:48 AM the next morning, I had a message from Dr. Sullivan with an assessment of the results and our next step. Amazing, and I would recommend him to any and everyone. Excellent medical experience.

Reviewed on Jun 6, 2024

I have never felt so cared from and heard. The doctor came across as not only kind but loving. You felt like they took care of you as though you were their family!

Reviewed on Jun 6, 2024

Dr. Sullivan is excellent in all regards .

Reviewed on Jun 6, 2024

The response by Dr. Sullivan and his team to MyChart messages is excellent. Contact and scheduling with other components of the Clinic is difficult and generally not as good as it should be..

Reviewed on Jun 6, 2024

Dr.Sullivan is an excellent listener. His approach is professionally friendly. His questions are very well coordinated to the point.I have always felt confident and safe in his care.

Reviewed on May 31, 2024

Dr Sullivan is an excellent communicator and doctor

Reviewed on May 30, 2024

Dr. Dan Sullivan can best be described in the single word exceptional.

Reviewed on May 29, 2024

Dr Sullivan is wonderful.

Reviewed on May 20, 2024

Dr Sullivan is excellent and incredibly helpful.

Reviewed on May 20, 2024

Consistently great doctors.

Reviewed on May 16, 2024

I have never been to a doctor that truly listened to me and was so very thorough.

Reviewed on May 15, 2024

Dr Sullivan and Cleveland Clinic are outstanding in every way!You set the standards for health care and customer care!

Reviewed on May 15, 2024

I would recommend Dr Sullivan and Cleveland Clinic to everyone

Reviewed on May 14, 2024

Dr Sullivan is first class

Reviewed on May 10, 2024

I wish there were more than 5's. I'd give Dr Sullivan 10's. He is a most remarkable caregiver! He answered all my questions, and provided advice on issues I had concerns about. A classic example why the Cleveland clinic is rated one of the top hospitals in the world!

Reviewed on May 7, 2024

Dr. Sullivan takes the time to explain treatment reasons and outcomes expected. This is very appreciated as it helps me understand the path toward better health. I am grateful for Dr. Dan's advocacy for me.

Reviewed on May 2, 2024

Dr. Sullivan is excellent. Great communicator.

Reviewed on May 1, 2024

Dr. Sullivan is excellent

Reviewed on Apr 26, 2024

Enjoy meeting and talking with Dr Sullivan. Very receptive to what I had to say!

Reviewed on Apr 24, 2024

Dr. Sullivan took the appropriate amount of time to get to know me....and then proceeded with the medical mission of our call.

Reviewed on Apr 23, 2024

Dr Sullivan is everything I want in a doctor - easy to talk to, good listener, knowledgeable, looks at me, kind, patient, thorough, efficient. What more could I ask for. He is a treasure!

Reviewed on Apr 23, 2024

Always get such good care at the Clinic. I am especially blessed having Dr Sullivan and his wonderful staff as my caregivers.

Reviewed on Apr 19, 2024

Best doctor ever

Reviewed on Apr 19, 2024

Dr Sullivan is an amazing, caring and consummate professional

Reviewed on Apr 19, 2024

Feel fortunate to have Dr Sullivan as my pcp

Reviewed on Mar 28, 2024

The professionalism and efficiency of CC has been a joy to deal with. Although the reason for the upcoming visit involves not great stuff, all I have dealt with have been compassionate especially Dr. Sullivan.

Reviewed on Mar 27, 2024

Doctor Sullivan is a superior human being who communicates with warmth, care, and validates the patient by listening to the patient on multiple levels, emotional, intellectual, medical. His depth of medical knowledge reassures that the care he suggests is the correct path to follow. He works with patient as a partner. Warmth and great humor!!

Reviewed on Mar 27, 2024

I cannot possibly begin to extend my gratitude to Dr. Sullivan! He is super brilliant, knowledgeable, attentive, informative, and on top of being a wonderful doctor- he is kind and friendly. He really spent a long time with me; getting to know me, and learning about my complex medical history. I feel like I'm finally going to get the medical help, attention and support that I've been searching for... And that i'm the best of hands with his care!

Reviewed on Mar 27, 2024

I highly recommend Dr. Sullivan! He's one of the best doctors I've ever seen in my life and there have been a lot of doctors!

Reviewed on Mar 26, 2024

Dr Sullivan has been outstanding throughout this process. He is kind, accessible, and empathetic.

Reviewed on Mar 26, 2024

Dr. Sullivan is an true professional with exceptional "bedside manor."

Reviewed on Mar 25, 2024

Dr. Sullivan's empathic listening skill is consistently on display. His appreciation for the impacts of complications of my son's spinal chord injury accident on my own health was unexpected and welcome.

Reviewed on Mar 21, 2024

Very good outcome zDr Sullivan was very good on hearing my situation with my legs overall I was very satisfied. THANK YOU

Reviewed on Mar 21, 2024

Very impressed with Dr. Sullivan's knowledge of my medical history prior to speaking with me. He was very kind, informative, and so easy to talk to.

Reviewed on Mar 13, 2024

Dr Sullivan is kind and caring. However, the delay in care in getting an initial appointment was not acceptable until a family friend called CC. Also the consult made after the initial assessment is over four months away. This delay in care is unacceptable making the initial assessment not helpful at all for daily episodes of very concerning symptoms.

Reviewed on Mar 13, 2024

Dr. Sullivan is great, scheduling on CC appointments has been tough

Reviewed on Mar 12, 2024

Dr. Sullivan who act as my primary care managers and outstanding physician.

Reviewed on Mar 5, 2024

Dr Dan Sullivan is the Best doctor I've ever had. Felt comfortable enough to share myShort story.

Reviewed on Feb 21, 2024

Dr Sullivan was very thorough and kind. He was extremely well prepared. He asked great questions and overall I experienced very high quality care from him.

Reviewed on Feb 21, 2024

Dr. Sullivan was so wonderful at explaining everything. I feel confident that my medical issues will be resolved working with him and the rest of the doctors at the Cleveland clinic.

Reviewed on Feb 20, 2024

Dr. Sullivan has been wonderful at responding to messages, organizing appointments and communicating thru this process!

Reviewed on Feb 20, 2024

Again Zoom didn't work, talked over telephone. The Dr called me.

Reviewed on Feb 20, 2024

Dr. Sullivan was very respectful and showed genuine care for my situation

Reviewed on Feb 12, 2024

Dr Sullivan seems genuinely concerned with my issues and concerns and demonstrates a sincere desire to. Structure a treatment protocol effective in Meeting our objectives.

Reviewed on Feb 1, 2024

Doc Sullivan's office was instrumental in getting us scheduled with multiple doctors on short notice.

Reviewed on Feb 1, 2024

Doc Sullivan was very personable and helpful.

Reviewed on Jan 25, 2024

Excellent experience. Dr Sullivan listens and gives thoughtful responses. He is a problem solver !

Reviewed on Jan 25, 2024

We need more physicians like Dr Sullivan

Reviewed on Jan 24, 2024

Dr. Sullivan has the best " bedside" ( in this case " office") manner of any doctor I have ever seen, and I am soon to be 85 so have seen a few. He is attentive, charming, knowledgeable, and extremely helpful. Again, the most h satisfactory office visit with a doctor I have ever had.

Reviewed on Jan 23, 2024

Dr. Sullivan is my favorite doctor, he is kind, courteous, empathetic, and always optimistic. I sleep better after talking to him.

Reviewed on Jan 22, 2024

Dr Sullivan is our quarterback. He is so caring and listens to what you say and don't say. He cares about the whole family. Many cities we have lived in. Many hospitals. Way too many doctors trust me no one more knowledgeable, caring and kind as Dr. Sullivan.

Reviewed on Jan 22, 2024

Dr. Sullivan answered all my questions, gave good advice, and put my mind at ease about a couple concerns I had. He is by far the best general internist I have seen my entire life (78 years!). He also communicated with the other doctors I saw that week. The coordination amongst various doctors impressed me the most. I felt SO cared for.

Reviewed on Jan 16, 2024

Dr Sullivan went above and beyond to provide world class service.

Reviewed on Jan 12, 2024

Excellent doctor

Reviewed on Jan 8, 2024

Dr Sullivan the best

Reviewed on Jan 5, 2024

Dr Sullivan was Fantastic. He actually listened to my concerns

Reviewed on Jan 5, 2024

From initial contact via MyChart message to the video meeting with Dr. Sullivan, every step went smoothly, including timely and quick response.

Reviewed on Jan 5, 2024

Dr. Sullivan helped me to understand the potential importance and seriousness of my situation, what to consider regarding my follow-up X-Ray and Ultrasound, and what questions to ask to fully understand the results of the testing and next steps based on the outcomes.

Reviewed on Dec 20, 2023

Excellent doctor

Reviewed on Dec 7, 2023

I realize doctors appointments can take a while. It's a bummer to have to wait 2 more months before I can see a specialist but I realize it's a busy industry and others need care as well.

Reviewed on Dec 6, 2023

Dr. Sullivan is one of the best general practice doctors we have had. He is very professional, great listener, very polite, very respectful and extremely efficient. He makes appointments very pleasant and makes us feel he cares. Wish all doctors were like Dr. Sullivan.

Reviewed on Dec 5, 2023

Dr Sullivan was very professional, thorough and caring.

Reviewed on Nov 29, 2023

Dr. Sullivan was very affable. Communication to and from clevland is easy. I wish we could schedule sooner than April, but also in some ways, it's aitwcke it's not next september.

Reviewed on Nov 29, 2023

The appts set up pre arrival to CCF and schedule made for my visit to Cleveland Clinic were spear headed by Dr. Sullivan. HE did an excellent job anticipating both my needs and moved around an appt to better serve me as well during the visit.

Reviewed on Nov 29, 2023

Dr. Sullivan is an excellent, kind, thorough doctor. He is definitely an asset to CCF and was a godsend in my medical care and future care to come. While what is bothering my chronic issue is something we don't "today" have a cure for, the issues and information was both well explained to me and my daughter as well as gave me some things that I can do "now" to get me stronger, healthier or better fit and improve my life even before the cure is ready. I appreciated Dr. Sullivan's wit, education and delivery of information as well as his engaging personality. He is an asset to CCF and I was grateful to be under his care while at CCF. I would highly recommend Dr. Sullivan to anyone in need. He was very good to talk to both as a doctor and expert but also as a person and went beyond in making sure my care was the very best it could be.

Reviewed on Nov 29, 2023

Dr. Sullivan and Dr. Mayuga were excellent in helping me understand my current issue/s and how I can try to improve upon them while awaiting a cure for the issue that is currently giving me a run for it health wise. I was appreciative for both their collaboration and discussions with my daughter and myself. We felt I was well cared for and was also gaining some insight and answers, two things that had eluded me and my health care for two years prior to my CCF visit. It was very nice to speak with doctors who understood my health issues and could also give me some direction for today while awaiting a cure for the additional health issue and also offer their hope, expertise, kindness and direction.

Reviewed on Nov 21, 2023

Dr Sullivan was beyond excellent. He showed interest in my questions and concerns, he included and listened to my input about my care, and he thoroughly explained reasons and options for my care. Best Dr ever.

Reviewed on Nov 20, 2023

I can't write enough good things about this doctor and the staff at your hospital

Reviewed on Nov 16, 2023

Dr. Sullivan is the finest primary care doctor I have ever had. His dedication and concern for his patient's is genuine and professional.

Reviewed on Nov 14, 2023

I had a prior appointment that really upset me. Dr. Sullivan noticed right away and assured me he was going to help me no matter what.

Reviewed on Nov 10, 2023

Dr. Sullivan was the best doctor I've seen. I was incredibly scared when I saw him and didn't know what was wrong with me. He was so calm and did not rush through any part of the appointment. He even called on a Saturday to check in and personally let me know blood work results.

Reviewed on Nov 3, 2023

Dr Sullivan listened and heard my concerns and offered possible options for testing and specialists

Reviewed on Nov 2, 2023

I give him only 5 cause the chart is not going higher. Dr. Sullivan is incredible! He makes you feel accepted, heard and important. He makes sure nothing is missed and is so compassionate and patient. He made my first steps in CC unforgettable experience in a wonderful way. Thank you for everything!

Reviewed on Nov 2, 2023

Doctor was terrific.

Reviewed on Oct 30, 2023

Dan Sullivan is the best physician I have encountered.

Reviewed on Oct 24, 2023

Dr. Sullivan was highly prepared to discuss and advise my case. I have an inactive pituitary following Gamma Knife radiation to address an ACTH tumor. There are early signs that the tumor may be growing back. I'm seeing a specialist at Stanford Medical Center. And, I'm confident that Dr. Sullivan is an effective Internal Medicine person to see to my general medical needs!

Reviewed on Oct 17, 2023

Dr. Sullivan listens to your concerns. He then goes above & beyond with addressing the concerns either verbally, through testing or referring you to an appropriate specialist.

Reviewed on Oct 17, 2023

The care I have received from Dr Sullivan is hands down the best I have ever experienced in all of the above categories.

Reviewed on Oct 11, 2023

Dr. Sullivan was extremely professional and amazingly kind and knowledgeable. I am honored to be his patient.

Reviewed on Oct 9, 2023

It truly was a great experience. I felt heard which doesn't seem to happen with too many physicians

Reviewed on Oct 5, 2023

I am so happy to be accepted as a patient by Dr. Sullivan. The appointment was great, and Dr. Sullivan advised me In a manner that I had not been directed before. Feel quite optimistic, and confident with Dr. Sullivan!

Reviewed on Oct 4, 2023

Dr. Sullivan is one of the best doctors I have ever had. He took his time explaining things and answering questions for both my husband and I. I am very grateful for his kindness and his ability to put me at ease at a time when I was so very sick.

Reviewed on Oct 4, 2023

Dr. Sullivan is a mater of communication with top notch emotional intelligence

Reviewed on Oct 4, 2023

My primary physician, Dr. D Sullivan, has 'gone beyond the call of duty' to help me with my medical problems.As has his and the whole team of health professionals.Am MOST grateful.

Reviewed on Sep 27, 2023

Dr. Sullivan is a very knowledgeable and personable doctor. He is a very good listener.

Reviewed on Sep 26, 2023

Dr. Sullivan is top of the line! He was very welcoming, thorough, explained things well, and even cheered my progress. Also, very encouraging. I couldn't ask for more!

Reviewed on Sep 25, 2023

My experience throughout my visit was nothing but positive. Including my time with Dr Sullivan remotely.

Reviewed on Sep 6, 2023

Dr. Sullivan was the best doctor I have ever experienced. He was patient, very knowledgeable, and personable. I left my appointment knowing I was in good hands and I am so thankful.

Reviewed on Sep 6, 2023

Dr. Sullivan was wonderful. He was patient, knowledgable, personable. I left reassured that I was in good hands.

Reviewed on Aug 31, 2023

Dr. Sullivan is outstanding . He definitely listened and conveyed real understanding of my concerns.

Reviewed on Aug 24, 2023

Wonderful doctor

Reviewed on Aug 23, 2023

Dr. Sullivan is simply outstanding. He's patient, listens, explains and treats not only the malady but is extraordinary compassionate and respectful. Just amazing!

Reviewed on Aug 21, 2023

Dr. Sullivan was among the very best clinicians I have encountered in my many years of medical visits. I greatly appreciated his medical acumen and knowledge as well as his kindness and care. I'd love to have him as my internal medicine doctor in my home town! Absolutely top notch.

Reviewed on Aug 21, 2023

My three days of consultations organized and results reviewed and interpreted by Dr. Sullivan were more than worth my travel from out of state and hotel stay in Cleveland. Should I need second opinions and reviews in future, I will head straight for the Clinic

Reviewed on Aug 17, 2023

Great doctor, enjoyed talking with him

Reviewed on Aug 17, 2023

Dr Sullivan , comes prepared and is a good listener and communicator of plan of action

Reviewed on Aug 7, 2023

This experience was exceptional. Dr Sullivan is a one of a kind doctor. He listens, shows empathy, and is knowledgeable. There have been many doctors I have seen at this hospital and I am so fortunate to have him as my doctor.

Reviewed on Aug 7, 2023

Dr Sullivan is excellent. He listened to my current issues and contacted the team that was going to be seeing me regarding my heart follow up and my Breast issues follow up. Dr Sullivan seemed to truly care for me and saw that this time I came In a wheelchair due to severe back pain and leg pain. He had me seen by the Spine Center and Dr. MEKHAIL In pain management. Dr Sullivan said I can return to see him at the end of the week before I make the 7 hour car trip home. I was pleased that he would squeeze me Into his tight schedule at the end of all my appointments at CCF.

Reviewed on Aug 7, 2023

DR MIHALJEVIC, DR SULLIVAN and SEAN HARRISON were all fantastic in setting up all my needed appointments during the week of my heart tests. Seemed liked they truly cared for my health issues and wanted me to see the best doctors while I was at CCF.

Reviewed on Aug 2, 2023

Thank you Dr. Sullivan for all your help.

Reviewed on Aug 2, 2023

The doctor was wonderful and I had so far wonderful experience

Reviewed on Jul 17, 2023

Dr Daniel Sullivan was EXCELLENT!!

Reviewed on Jul 11, 2023

Dr. Sullivan is top notch, he provides excellent care. He is considerate, informative and responsive.

Reviewed on Jul 10, 2023

Allison with Dr. Sullivan is the most amazing person. She is always so kind and very helpful. She is also very patient and efficient.

Reviewed on Jul 10, 2023

Dr. Sullivan is the most amazing general practice physician I have seen. He is genuinely concerned and very attentive. He listens and he is never in rush. He is easy to talk with and explains everything in understand terms. He truly is the best there is

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