Eugene Byun, MD
Fullerton, CA 92835
- Mission Heritage Medical Group and Affiliated Physicians
- St. Joseph Heritage Medical Group and Affiliated Physicians
- St. Jude Heritage Medical Group and Affiliated Physicians
Fullerton, CA 92835
St. Jude Heritage Fullerton - Cardiology
100 East Valencia Mesa Drive, Suite 206, Fullerton, CA 92835
Insurances Accepted
This information provides an overview of accepted insurance plan types. Coverage may vary by specific plan. Please verify your with your insurance provider before visiting us for care.
- TriWest - Tricare
- Providence Health Plan - Medicare Advantage
- United Healthcare PPO
- Blue Shield of CA HMO - Trio
- Health Net - Medicare Advantage
- US Family Health Plan - TriCare
- United Healthcare HMO
- Blue Shield of CA PPO
- Multiplan PPO
- Blue Shield of CA HMO
- Vivity by Anthem Blue Cross
- Anthem Blue Cross Medicare PPO
- Blue Shield of CA Medicare Advantage
- Health Net PPO
- Anthem Blue Cross HMO
- Anthem Blue Cross PPO
- SCAN Medicare Advantage
- Aetna Medicare Advantage HMO
- Aetna Medicare Advantage PPO
- Aetna PPO
- Anthem Blue Cross Medicare Advantage
- Cigna PPO
- Cigna HMO
- Aetna HMO
- Coventry/First Health PPO
- Health Net HMO
- HealthSmart (Interplan) PPO
- No results found
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About Eugene Byun
Dr. Eugene Byun is a cardiologist in Fullerton, California and is affiliated with St. Jude Medical Center. He received his medical degree from Indiana University School of Medicine and has been in practice for more than 20 years.
- American Board of Internal Medicine, Interventional Cardiology
- American Board of Internal Medicine, Cardiovascular Disease
100 East Valencia Mesa Drive, Suite 206
Fullerton, CA 92835
Providence St. Joseph Hospital - Orange
Providence St. Jude Medical Center
Community Reviews
At Providence, we're dedicated to providing you quality, personalized health care. We are constantly striving to optimize your experience.
As part of ensuring you have a positive experience with Providence, our online provider directory includes ratings and patient comments for select providers. More about our survey.
Dr Byun is terrific He has earned my total confidence. His team is also terrific.
Providence Patient
Very satisfied with everyone most especially Dr. Byun. Very caring and sweet to his patient.
Providence Patient
For over thirty years he has been keeping me going after I had 6 bypasses in 1991, he took over my care and has done an exceptional job.
Providence Patient
Based on my experience with St. Jude Hospital Dr. Eugene Byun is the best cardiologist at St. Jude Hospital in Fullerton. Fortunately Dr. Byun was on duty in the ER on February [Date], 2024. He saved my life when I had a heart attacked on February [Date], 2024. He spends ample time to make me and my son [Names] to understand my health situation. I am requesting Dr. Byun to accept my husband as a new patient now that Dr. Rathod told us that he is retiring effective July [Date], 2026. Additionally Dr. Rathod is also a very good cardiologist. Another best provider with St. Jude Hospital is our PCP Dr. Leo Garcia. He is a very good internal medicine and recommendable PCP. My whole family sees him as our PCP.
Providence Patient
I am very happy with my provider and all my doctors especially with my cardiologist an excellent doctor thank you
Providence Patient
Very good
Providence Patient
Dr. Byun is always kind, knowledgeable, interested and professional during all visits. I can't say enough about the good care I receive.
Providence Patient
Great Doctor
Providence Patient
Excellent Cardiac Care.
Providence Patient
Always positive experience.
Providence Patient
Dr. Byun is patient and thorough. He explained what his concerns is and why he increased the dose of my medication. Excellent doctor who looks out for me to prevent problems in the future.
Providence Patient
Dr. Byun Is a highly intelligent, compassionate, and knowledgeable cardiologist. He answered all of our questions thoughtfully and thoroughly. Six months ago, he saved my life in the ER and has continued to monitor my progress. I will always be grateful for his expertise and kindness.
Providence Patient
Dr. Byun is a good listener and explains things very well. Always seems interested in you and your questions.
Providence Patient
He is the best. I feel I am in good hands.
Providence Patient
Pleasant experience with the doctor and staff. Easy to understand.
Providence Patient
Outstanding care!
Providence Patient
Dr. Byun is a highly recommended cardiologist.I appreciate his professionalism and care for his patients.
Providence Patient
Good morning experiences
Providence Patient
Doctor Byun is a fantastic doctor I've gone to him for a long time and feel very comfortable having him treat me
Providence Patient
I can easily voice my concerns about my health and get the information I need. I feel understood and respected
Providence Patient
A professional Dr. Byun.
Providence Patient
Dr. Byun is always a doctor is trust and is always easy to understand. I highly recommend him for anyone needing a cardiologist. He is a wonderful doctor!
Providence Patient
All good.
Providence Patient
ALWAYS excellent
Providence Patient
Dr Byun is and has always been a caring provider
Providence Patient
Dr Byun is an excellent provider that is very compassionate caring and understanding. He has taken excellent care of my heart problems and concerned of my overall health. I could not ask for a better cardiologist. Thank you Dr. Byun.
Providence Patient
Dr. Byun is very patient and spends the time necessary to convey all options and information regarding ongoing care.
Providence Patient
Excellent
Providence Patient
Dr Byun is the best cardiologist I've ever seen
Providence Patient
I've always been treated with concern and kindness.
Providence Patient
I appreciate Dr. Byun!
Providence Patient
I'm very happy with Dr. Byun.
Providence Patient
Very satisfied with Dr Byun
Providence Patient
When I had my heart issues Dr Byun was the first to see me. I have had great care from him. Thank you, Dr Byun.
Providence Patient
Everything good
Providence Patient
Prompt and very concerned about condition
Providence Patient
Since starting at St. Jude in 2022, I have had the best care from every Dr I have seen. Your staff is wonderful, kind, and respectful
Providence Patient
Wonderful Dr
Providence Patient
Dr. Byun has been my cardiologist for many years. Thanking my maker he was at the hospital the day I had my heart attack. He has been my cardiologist since then. I would sincerely grieve to lose him as my doctor. Number one reason why I do not want to move from St. Jude and California. Sincerely, [name]
Providence Patient
Good
Providence Patient
He explains everything and answers questions in detail.
Providence Patient
Every thing was well done
Providence Patient
Dr Byun is a excellent Doctor!
Providence Patient
Dr. Byun is great
Providence Patient
Been going to Doctor Byun for almost 20 years. Best doctor I have ever had. I highly recommend him
Providence Patient
Has taken care of me for many years. Very thankful
Providence Patient
Dr. Byun is great, he is very caring, give me good advice and concern of my health
Providence Patient
Dr. Byun continues to give me the best care. He is thorough, knowledgable, and listens to any of my concerns or questions. He is an outstanding cardiologist.
Providence Patient
Very confident and comfortable with Dr. Byun
Providence Patient
Best Doctor explaining issues and not in a hurry
Providence Patient
Absolutely wonderful and when I was confused at what he said, my Son [name] understood everything that was medically said!
Providence Patient
Dr. Byun is absolutely the best! Always listens and gives the best advice.
Providence Patient
He is good doctor
Providence Patient
Dr Byun is very thoughtful and thorough! I wish all medical providers were like that.
Providence Patient
Dr. Byun and his team are always top flight. They listen, they are efficient and effective and courteous. Dr. Byun is hugely knowledgeable about the heart. He listens and then talks me through my concerns. I always feel reassured when I leave his office.
Providence Patient
Dr. Byun is an excellent surgeon and I have great regard for him. He is friendly open and honest man who does his best to treat and assist his patients in their recovery. One walks out of his office grateful and encouraged.
Providence Patient
I'm very satisfied with every one of the Doctors at St. Jude.
Providence Patient
He recognized an emergency situation and followed up w a stat exam and appropriate medication .
Providence Patient
Dr Byun is an extremely professional and caring cardiologist. He is very patient and kind. He explains medical issues in layman's terms and answers all my questions during my visits with him. He is a great doctor and I am so lucky that I am his patient!
Providence Patient
Every body in this place is very professional Every body answer to my questions And there ready to helpThank you
Providence Patient
Felt like my concerns were addressed by Dr. Byun.
Providence Patient
Dr. Byun is a good diagnostician , listens to my concerns and provide excellent care. He looks at the Whole Person when providing care.
Providence Patient
Dr Byun always listens attentively to what I say to him.
Providence Patient
I have interacted with Dr Byun for over twenty years and know him to be meticulousl in his care
Providence Patient
Dr. Eugene Byun is highly recommendable as one of the best physician in the Cardiology department.
Providence Patient
Dr. Byun is the ultimate professional. Friendly, courteous, respectful, competent, and I TRUST HIM!
Providence Patient
Dr Byun is the best ! I love my Cardiologist !!!!
Providence Patient
Excellent care and concern for my health
Providence Patient
It is excellent. I am very thankful for everything they have done for me. It was life-saving.
Providence Patient
Excellant
Providence Patient
Awesome Team of Doctors
Providence Patient
Always have my best interests
Providence Patient
Dr Byun is the BEST!
Providence Patient
I am always pleased with my appointments with Dr. Byun. He always answers any questions I have asked him, I rarely have to wait long for an appointment. Dr. Byun is always cheerful, helpful and always answers questions I have.i highly reccomend Dr. Byun!!
Providence Patient
I am very happy with this provider.
Providence Patient
Dr Byun is the best!!!
Providence Patient
Dr.Bynum is a great cardiologist he cares about his patients. I would refer him to my family members and friends
Providence Patient
Dr.Byun is an excellent cardiologist. He is friendly and courteous. He explains medical problems in a way that is understandable.He doesn't rush through appointments but always gives as much time as needed to examine me, answer my questions and explain changes to meds.
Providence Patient
Everyone at st Jude were very proffiional from nurses to specialist doc
Providence Patient
All positives!
Providence Patient
Dr. Byun is wonderful!! He always explains everything going on with my health. He listens to all my questions and concerns. Very lucky to have him as one of my doctors, would not change a thing.
Providence Patient
I feel blessed to have Dr. Byun as my cardiologist.
Providence Patient
Very kind & informative
Providence Patient
Health care is good.
Providence Patient
Excellent Surgeon, all went as planned. He is very polite and explains so the layman can understand
Providence Patient
I LOVE Dr. Byun! The GREATEST CARDIOLOGIST there is.. So blessed and lucky to be one of his patients!
Providence Patient
Dr. Byun is always professional, caring and supportive with my care and medical advice.
Providence Patient
Dr Byun is an excellent physician and cardiologist. When I had my follow up visit, he spent quite a bit of time with me and answered all of my questions in an easily understandable way.
Providence Patient
Been my doctor for over 27years, several surgeries and always have good experiences with his care.
Providence Patient
Dr. Byun is a very professional physician.Very knowledgeable and helpful and friendly doctor.
Providence Patient
Great Team.
Providence Patient
Always good!
Providence Patient
I don't have any thing negative to say about this doctor, or his staff. They are absolutely fantastic! In my experience with my medical needs over the last 78 years I can honestly say they are as close to perfect as they could possibly be. It has always been a positive and pleasant experience with this doctor, his staff and the entire facility. A true blessing for me in so many ways.
Providence Patient
Great dr
Providence Patient
The doctor took time to explain everything very well. This appointment was a follow up to surgical procedure. Very kind doctor.
Providence Patient
Dr. Byun is a marvelous physician and his staff was excellent.
Providence Patient
Outstanding seervice . Very thorough and positive.
Providence Patient
Dr Byun is absolutely the best cardiologist in California. Super doctor. He always explains everything and I know my heart health is in good hands.
Providence Patient
Always love seeing Dr Byun and the staff is efficient and friendly too
Providence Patient
Whenever I go to see Dr Buyun, I am treated very well by the receptionist by the staff and by Dr. Buyun
Providence Patient
Excellent care from Dr. Byum ! I greatly appreciate his expertise and care.
Providence Patient
Everything went very well an I was very satisfied with all of the care, knowledge, professionalism, an respect that I received!!
Providence Patient
Dr. Byun is very easy to talk to, very caring , concern of my health, give me good advice , very knowlegible , I am very glad to have him for my Doctor.
Providence Patient
Excellent professional care.
Providence Patient
I am very pleased with Dr. Byun and all the services he provides.
Providence Patient
I have been a patient of Dr. Byun for over 10 years and he is consistently the best. He is personable, attentive , friendly, thorough and obviously an expert in his field. I wouldn't trade him for the world. He takes the time necessary to thoroughly explain matters and ensures I understand before he proceeds. He couldn't rank any higher on my list of favorites .
Providence Patient
Dr. Byun is, simply stated, the best. He lives up to and exceeds his reputation as a superior specialist. I trust him and his staff!
Providence Patient
Very friendly and patient, answered all my questions and concerns.
Providence Patient
Always professionalFriendlyWell informedCould not be better
Providence Patient
Visit was as usual both courteous and informative.
Providence Patient
Dr. Byun has always been very easy to deal with. He has great recall of our previous appointments, always has previous information available, and is exceptional at listening to the answers to the questions he asks. He will also ask follow-up questions if he hears something that is either out of the normal or different from what was reported in the past.Extremely efficient, yet has exceptional bedside manner. I have never once felt I was just another number to him and have always felt he valued my health as a person.
Providence Patient
I am very satisfied with Dr. Byun
Providence Patient
Dr Bryan and his team provided the best possible care I can experience. Their staff wast just knowledgeable but more importantly went above and beyond to take care of me and give me the information to get in great health. DR Byun is an amazing Dr who saved my life with an emergency procedure
Providence Patient
It was a 6-month checkup and everything checked out OK.
Providence Patient
All good!
Providence Patient
Very good
Providence Patient
I have been seeing Dr Byrun for years and I will never change to another cardiologist unless I really have to. He is a very caring doctor
Providence Patient
I feel like Dr Byun is a great doctor. I have total confidence in him. His staff is great too.
Providence Patient
Excellent
Providence Patient
I have always received excellent service from what I feel is my care team. Whether it is a simple question or a serious procedure the doctor and staff has always helped me in timely manner
Providence Patient
Dr. Byun has been my cardiologist for many years. I see him annually to keep track of my heart functioning. All continues to be going along well with current medsand working on lifestyle changes.
Providence Patient
Well done
Providence Patient
Great bedside manner always spends enough time. Always seems concerned with how I am doing.
Providence Patient
Dr.Eugene Byun is the best they should have more doctors like him!
Providence Patient
Always through
Providence Patient
The service was done on time and in a very professional manner.
Providence Patient
Dr. Byun is great!
Providence Patient
Everything was as I expected
Providence Patient
Very thorough.
Providence Patient
Dr was very informative and helped me to understand my condition.
Providence Patient
Everything was good
Providence Patient
Dr Byun is a very accomplished heart doctor and seems to be very current with medical breakthroughs
Providence Patient
Dr Byun is caring and knowledgeable.
Providence Patient
Dr. Byun is always on top of my health information & makes recommendations for maintaining my health.
Providence Patient
Dr Byun provides excellent care.
Providence Patient
Excellent Doctor. I am long time patient.
Providence Patient
Excellent care
Providence Patient
Dr Byun is consistently the best for his patients!
Providence Patient
The office staff and the doctor are always polite, courteous and professional.
Providence Patient
Very positive attitude and attention
Providence Patient
Dr. Byun is such a great dr., we've always had nothing but extremely great experiences with him.
Providence Patient
I cannot say enough about Dr. Byun's excellent skills and his care for his patients. He listens attentively to the details that his patients share with him, gives feedback and always asks if we have any further questions. He is an excellent doctor. The hospital should have more surgeons like him. I am deeply grateful to be under his care.
Providence Patient
Dr. Byun has a very good bed side manner. He very easy to talk to.
Providence Patient
Dr.Byun is very professional The personal is the best
Providence Patient
I feel very comfortable with Dr. Byun and always trust his knowledge and recommendations.
Providence Patient
Excellent care and courteous treatment as always.
Providence Patient
Dr. Byun is wonderful!
Providence Patient
Thank you Dr Byun for providing high quality medical expertise.
Providence Patient
Dr was thorough and informative and kind and understanding love my care from them
Providence Patient
Dr Byun is an amazing physician; he is caring, professional and listens to questions.
Providence Patient
Thank you Dr. Byun
Providence Patient
Love my doctors
Providence Patient
I have used this care provider for over 30 years. Had cancer operation, 3 pace makers, emergency room treatments and have never been disappointed with the service I received. This facility has a lot going for it. My only complaint is having to pay for parking. There should be a section for free handicap parking.
Providence Patient
Dr. Byun is very present during my visits. Always has a response to my concerns.
Providence Patient
He is very caring, very knowledgeable, give me good advise, he is a very good doctor and I am very happy to have him for my doctor.
Providence Patient
Conditions and Procedures
- Abnormal Calcium Score
- Abnormal Coronary Angiography
- Abnormal Stress Test
- Alcohol Septal Ablation
- Anomalies Of The Coronary Artery
- Aortic Valve Disease
- Atherectomy
- Atherosclerosis
- Atherosclerosis Of The Aorta
- Atrial Septal Defect (Asd)
- Atrial Septal Defect (Asd) Closure Device Placement
- Bicuspid Aortic Valve
- Cardiac Angina
- Cardiac Rehabilitation
- Cardiogenic Shock
- Cardiomyopathy
- Carotid Artery Angioplasty
- Carotid Stent
- Chest Pain
- Chronic Total Occlusion
- Claudication
- Congestive Heart Failure (Chf)
- Coronary Angiography
- Coronary Angioplasty
- Coronary Artery Disease
- Coronary Artery Fistula
- Coronary Artery Stent Placement
- Coronary Calcium Scoring
- Directional Atherectomy
- Edwards Sapien Transcatheter Aortic Heart Valve
- Embolic Protection Devices
- Exercise Intolerance
- Extracorporeal Membrane Oxygenation
- Familial Dilated Cardiomyopathy
- Familial Hypertrophic Cardiomyopathy
- Femoral Artery Angioplasty
- Heart Biopsy
- Hypertrophic Cardiomyopathy
- Idiopathic Hypertrophic Subaortic Stenosis
- Intra Aortic Balloon Pump
- Intravascular Ultrasound
- Ischemic Cardiomyopathy
- Laser Atherectomy
- Lithotripsy
- Mechanical Circulatory Support
- Minimally Invasive Aortic Valve Replacement
- Minimally Invasive Mitral Valve Repair
- Mitral Regurgitation
- Mitral Valve Disease
- Mitral Valve Prolapse
- Mitral Valve Regurgitation
- Mitral Valve Stenosis
- Myocardial Infarction (Mi)
- Myocarditis
- Myxoma
- Optical Coherence Tomography
- Paravalvular Leak Repair
- Patent Foramen Ovale
- Patent Foramen Ovale Closure
- Percutaneous Mitral Valve Repair
- Percutaneous Valvuloplasty
- Peripheral Artery Angioplasty
- Peripheral Vascular Diseases
- Prinzmetals Angina
- Pulmonary Artery Stenosis
- Pulmonary Artery Thrombectomy
- Pulmonary Valve Disorders
- Pulmonary Valve Insufficiency
- Pulmonary Valve Stenosis
- Radial Coronary Access
- Refractory Angina
- Replacement Cardiac Valve
- Rheumatic Aortic Regurgitation
- Rheumatic Aortic Stenosis
- Rheumatic Diseases Of Pulmonary Valve
- Rheumatic Heart Disease
- Rheumatic Mitral Regurgitation
- Rheumatic Mitral Stenosis
- Right Heart Catheterization
- Right Heart Failure
- Right Ventricular Hypertrophy
- Rotational Atherectomy
- Shortness Of Breath (Sob)
- Subaortic Stenosis
- Thrombectomy
- Thrombolysis
- Transcatheter Aortic Valve Replacement (Tavr)
- Tricuspid Regurgitation
- Tricuspid Valve Disease
- Valve Stenosis
- Valvular Endocarditis
- Venous Thromboembolism
Dr, Byun and his staff are very kind , respect and care patients with professional manners . Places are very clean and neat .
Providence Patient