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Department Cardiovascular Medicine
Primary Location Avon - Richard E. Jacobs Health Center
Type of Doctor Adults Only
Languages English
Surgeon No
Avon - Richard E. Jacobs Health Center
Primary Location

Avon - Richard E. Jacobs Health Center


Additional Locations

Cardiovascular Medicine

Fairview Hospital

18101 Lorain Avenue
Cleveland, OH 44111


Cardiovascular Medicine

Avon Hospital

33300 Cleveland Clinic Blvd
Avon, OH 44011

Specialties & Treatments

Treatment & Services

  • Cardiac Electrophysiology
  • Cardiac Electrophysiology and Pacing Section
  • Cardiovascular Medicine
  • Cardiovascular Medicine Department
  • Regional Heart and Vascular
  • Sports Cardiology Center
View all 6 Treatment & Services +


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About Lon Castle, MD

Lon Castle, MD, is a Staff Electrophysiologist with Cleveland Clinic. Dr. Castle is a fellow of the Heart Rhythm society. . He also serves as a medical consultant to the National Football League. Dr. Castle is board-certified in internal medicine and cardiovascular disease and is a Diplomate of the Board of Medical Examiners. His specialty interests focus on implanting devices that correct heart rhythm malfunctions and electrophysiologic studies and ablations of cardiac arrythmias.

A Pennsylvania native, Dr. Castle attended Temple University as an undergraduate in the School of Pharmacy, continuing on to receive his medical degree. He completed his clinical internship and residency at the Geisinger Medical Center in Danville, Pa., before joining the United States Air Force. During his military service, Dr. Castle served as Chief of Medicine at Little Rock Air Force Base in Arkansas. Upon leaving military service, Dr. Castle received a fellowship in cardiology from Cleveland Clinic, where he became Head of the Section of Cardiac Pacing and Electrophysiology. Dr. Castle was originally appointed to Cleveland Clinic in 1973. After a four-year absence, he was re-appointed to the Cleveland Clinic in 1998.

 Dr. Castle  has been widely published in such journals as American Heart Journal, Journal of Electrophysiology and Clinical Progress in Pacing and Electrophysiology. In addition to his current role as medical consultant to the National Football League, Dr. Castle has been a past medical consultant for the Cleveland Indians, Cleveland Cavaliers and the Cleveland Ballet, and he served as Associate Team Physician for the Cleveland Browns.

Dr. Castle is a Fellow in the American College of Cardiology. He is a member of the Heart and Rhythm Society, Fellow of  American College of Cardiology, the Cleveland Academy of Medicine, the Ohio State Medical Association and the Northeast Ohio Pacemaker Society.

Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - Cleveland Clinic
Cleveland, OH

Residency - Geisinger Medical Center
Danville, PA

Internship - Geisinger Medical Center
Danville, PA

Medical Education - Temple University School of Medicine
Philadelphia, PA

Undergraduate - Temple University
Philadelphia, PA United States


  • Internal Medicine
  • Internal Medicine - Cardiovascular Disease

Specialty Interests

cardiac arrhythmias, device implantation, electrophysiologic studies and ablation of arrhythmias

Research & Publications

Research & Publications

See publications for Lon Castle, 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 3/28/2023, Dr. Castle 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

265 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
5 out of 5
Explains 4.9
Listens 4.9
Courtesy, Respect & Concern 5
Patient Rating of Doctor 5

43 Patient Comments

Reviewed on May 29, 2024

I feel very blessed to have been able to see Dr. Castle as he is well respected in the area of my heart issues.

Reviewed on May 16, 2024

I always enjoy visits with Dr. Castle! He gives me full explanations to any questions I may have! Gives a lot of encouragement!

Reviewed on May 14, 2024

Dr Castle and his staff always treat me courtesy and with patience explains everything does not rush me in and out

Reviewed on May 2, 2024

Dr Castle is a very caring and a gifted Dr plus his staff are very good at the job. You should hang on to them as long as you can

Reviewed on May 1, 2024

Dr. Castle is excellent. I drive from Willoughby to Avon so he can be my cardiologist. I would drive a great distance for his care. I feel the same about Dr. Angel. They both are diligent, compassionate. They explain their plans for my care thoroughly and take the time to address my concerns, and answer my questions.

Reviewed on Apr 16, 2024

Dr Castle is exceptional. Have been with him for over 20 years. I have confidence in him. He is very knowledgeable

Reviewed on Apr 16, 2024

Dr. Castle is an excellent physician . Always listens and respects your concerns and questions.

Reviewed on Apr 15, 2024

Dr. Castle is outstanding in every way!

Reviewed on Apr 15, 2024

Dr.Castle makes you feel like a dear life long friend, l actually look forward to seeing him.

Reviewed on Apr 15, 2024

Dr. Castle is always a pleasure. He is very thorough and thoughtful.

Reviewed on Mar 28, 2024

I have seen Dr. Castle for 40 years there are no better

Reviewed on Feb 14, 2024

Great Doctor.

Reviewed on Feb 6, 2024

Dr. Castle is the best.

Reviewed on Feb 2, 2024

Physician encounter was very good

Reviewed on Jan 30, 2024

Dr. Castle is an excellent Cardiologist. Explains all tests and answers all questions in depth. Discussed all treatments and included me in the decisions.

Reviewed on Jan 17, 2024

Dr. Castle always explains everything well and the reasons for tests, diagnostics, meds. He explains what my test results reveal. I appreciate him

Reviewed on Jan 16, 2024

Dr. Castle and all of the staff are wonderful

Reviewed on Jan 5, 2024

Felt very comfortable with Dr.Castle and he answered all my questions. He put me at ease about my A-Fib.

Reviewed on Jan 2, 2024

I love Dr. Castle. He is very intelligent and pays attention to my concerns and questions

Reviewed on Dec 29, 2023

Dr Castle is excellent!

Reviewed on Dec 27, 2023

Dr. Castle goes beyond the rating of very good. Fabulous doctor.

Reviewed on Dec 13, 2023

I have seen Dr Castle for the last 44 years and there are no better, knowledge, professionalism, bedside manner, all excellent!

Reviewed on Dec 7, 2023

Dr Lon Castle is great!!! He answered all of my questions with care and compassion.

Reviewed on Dec 5, 2023

As always Dr Castle was excellent

Reviewed on Oct 30, 2023

I bless the day I found Dr. Castle.I

Reviewed on Oct 16, 2023

I felt comfortable with Dr Castle he showed me my chest X-ray and addressed my concerns and didn't make me feel rushed he is one of a kind When I left there I felt he answered all my questions

Reviewed on Sep 26, 2023

Dr. Castle is the best Cardiologist.

Reviewed on Sep 14, 2023

I feel in very good hands with Dr. Castle

Reviewed on Sep 11, 2023

Dr castle has been excellent stepping in for dr dressing.

Reviewed on Aug 31, 2023

Dr. Castle is an excellent doctor. He listens well and always involves me the decision-making process.

Reviewed on Aug 24, 2023

Dr. Castle is very courteous and explains everything very easy for a patient to understand. I'm a fairly newer patient to him and he has done an outstanding job at explaining my diagnosis and treatment to me. He is amazing at what he does!

Reviewed on Aug 23, 2023

Doctor Castle is an expert cardiologist and has been taking very good care of me for many years.

Reviewed on Jul 20, 2023

Dr. Castle interest in me as his patient was very caring. He explained everything to me and was very knowledgeable about my total medical picture. I wish there were more physicians like him. When I saw him I thought I have seen a real doctor.

Reviewed on Jul 19, 2023

Dr Castle is AWESOME!! Very caring and explains everything well and listens to you

Reviewed on Jul 19, 2023

Dr castle is the best!

Reviewed on Jul 18, 2023

Doctor Castle does a great job of explaining everything to me. Very Professional

Reviewed on Jul 7, 2023

Lon castle m.d. Is fabulous. It took quite a bit of time to get in with him but worth the wait. I'm happy that he's my doctor

Reviewed on Jul 3, 2023

Dr. Castle is simply the best!

Reviewed on Jun 29, 2023

A very good appointment. Great people, great doctor.

Reviewed on Jun 27, 2023

Dr. Castle took time and answered all questions excellent service

Reviewed on Jun 27, 2023

Dr Castle is very caring and professional one of the best doctors I had

Reviewed on Jun 27, 2023

Again everything was very professional and very caring with my doctor and his staff

Reviewed on Jun 15, 2023

Cleveland Clinic is VERY VERY LUCKY to have Dr. Castle.

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