Great staff. What can I say?…read moreGetting ready for a stress treadmill test. They were able to diagnose issues with my heart and get me on the right meds. Dr Mokaberri and Dr. Sylvan (original Dr I saw) over 15 years ago.

Incredible staff and Dr. Mark Miller was attentive and compassionate to my needs. My heart was…read morehaving issues but this team took great care of me. I felt welcomed and respected. I highly recommend this cardiologist team. My first time visiting, Dr. Miller did a EKG test then immediately had me scheduled the following week for a stress test and ultrasound of my heart to make sure I was healthy and thank God my heart is good to go!

I want to thank Dr. Jay Lee at Orange County Heart Institute for all his expertise & patience. He…read morefixed my heart rhythm problem so I won't ever have to deal with it again! Even afterwards when I thought there was another issue, he was patient & explained everything so I could understand it. My husband has been going to him for more than 20 years. He is a great doctor!! Thank you Dr. Lee!! The office staff is wonderful too!! Linda (& Bill) H, Anaheim

I had a heart monitor referral from my primary doctor, who…read moresent me here. I met with a tech who set it up. A couple of days in, my chest where the electrodes were began to burn. I took one of the electrodes up and saw my skin was blistering. I called and they said bring it back. I took it back and gave it to the che kin gal. I explained what happened and she said she would tell the tech/doctor what happened and they would call me to discuss the "next step", as I still needed to get my heart issue checked out. I included my name and all contact info in the box/bag which contained the heart monitor to make sure this wouldn't fall thru the cracks. No one ever called me to discuss what happened. I decided that if they were ok with letting a possible heart issue just be ignored I'll go over to UCI. That was shameful in my opinion

I had a wonderful experience at Cardiology Specialists of Orange County recently. I went in due to…read morean elevated resting heart rate and needed to be fully cleared before an overseas trip within 2 weeks. PA Tiffany was amazing. She was very thorough with her examination, patiently listened to all my concerns, and took the time to answer all of my questions. Her nurse was also very sweet and helpful. The entire staff at Cardiology Specialists of OC was pleasant, professional, and caring. One person who truly stood out was Charito in scheduling. Getting a stress test, heart monitor setup, and follow-up appointment scheduled in less than two weeks was a major challenge, but Charito truly worked miracles. She was incredibly kind, caring, and professional throughout the entire process. She went above and beyond to make sure everything was completed right on time. I sincerely want to commend Charito for her dedication and exceptional patient care. Her extra effort made a stressful situation so much easier for me. I highly recommend Cardiology Specialists of Orange County to anyone looking for a cardiologist.

While I appreciate getting my heart monitor here, place is bad…read more It is a very old building and the signage is very poor. I stood in line at the wrong place for 10 minutes before someone asked what I was there to do and told me I was on the wrong line/area. The walls are painted a dark yellow color and need to be re-done either bright white or a nice light blue. It makes it look even more depressing. Please step it up.

I mentioned to her that I have kidney stones; She proceeded to prescribe me Amlodapine for my…read morehypertension, a calcium channel blocker, which increases the likelihood of forming kidney stones.

Today I had an appointment to see dr.li at 9:10 it went by pretty fast she was very nice and…read moreprofessional her office is very clean and the front and back are very friendly staff I would totally recommend coming here

Good luck getting an appointment. While Dr Marin is a great cardiologist, you're only as good as…read moreyour front office staff. His appointment taker Myra never answers the phone, so you'll be forced to leave a message to set an appointment. And then you fall into the abyss. Although her voice mail greeting states she'll return the call within 24 hrs, and pull be lucky if you ever hear from her again. Either she is severely underpaid, is totally overwhelmed, or hates talking to people, but you won't get a return phone call. After numerous calls and msgs and no response, it's very easy to move on and replace Dr Marin. Sadly his "Director of First Impressions" is certainly a detriment to his practice.

I have been a patient of Dr. Marin's for a couple years and still continue to have follow up…read moreappointments every six months. I feel very blessed that he is the cardiologist who happened to be on call the day I was taken to the emergency room. His quick and decisive action was great which is needed in life saving circumstances. feel like I am in the best hands for my care going further. I would highly recommend him to anyone and everyone who needs cardiac care.

Fantastic doctor, showed genuine care for my health, even helped look into things that were not the…read morereason for my visit because he was actually interested in helping me get healthy. Great office staff and assistants.

Known him for several years; and has treated me well. He certainly knows his trade, and his…read morepassion is evident. Great doctor and excellent in cardiology!

This man did his studying/training at three of the topmost institutions in this country and the…read moreworld. Stanford, Harvard and Johns Hopkins. It just doesn't get any better than THAT folks! Anyone with credentials like that has got to be brilliant and Dr Chan is indeed extremely bright. His expertise is topnotch. He is very thorough, and he explains very well in simple language and slowly. He is an excellent listener and you do not feel rushed with him. His demeanor is charming and calming. He possesses all of the qualities everyone wants their doctors to have, but frequently find lacking. I am 83 and he has been my cardiologist since I moved to Orange County 12 years ago.

Dr. Michael Chan is an outstanding medical professional. I cannot speak highly enough about the…read morecare I have received from him over the years. He placed a stent for me many years ago and I continue to see him annually for checkups. It always amazes me how he manages to make you feel like you are the only person that matters in the moment, unlike so many other doctors that don't appear to like people. He pays attention to all the details and genuinely cares that you follow through with his advice. 9 times out of 10 he is on time which I love and demonstrates respect for his patient's time, where so many doctors seem to think their time is so much more important than yours. I find his staff to be generally responsive and do a great job too. I cannot recommend him enough.

My review is for the Orange office located on 681 S. Parker Street, Suite 100, Orange CA 92868…read more The cross street is Town & Country. My interventional cardiologist Dr. Dinesh Kumar and his office staff provided great communication to me on following up on appointments and other services. Dr. Kumar is very informative when discussing your test results and welcomes feedback. He is an interventional cardiologist and worked at Columbia University in NYC. His nurse Krista has a sunshine smile and a positive aura. The office building is very atrractive etc. Copayment is due immediately upon your medical visit. Their is an great cafe called eCroissant in the back of the 721 building that opens from 7am-3:30pm from Mon to Friday. The office is open daily from 8am to 5pm except on weekends. You can find and rate Dr. Dinesh Kumar on the healthgrades website. http://www.healthgrades.com/physician/dr-dinesh-kumar-xgxcn

AWFUL SCHEDULING PATIENT COORDINATOR EXPERIENCE: On Wednesday, June 17, 2026, between approximately…read more10:30 a.m. and 11:45 a.m., I called 877-430-7337 to schedule a stress test and spoke with a representative named Karen. Unfortunately, the interaction was extremely disappointing. After being on hold for more than 45 minutes, Karen was rude, dismissive, and condescending during our conversation. Before I was able to fully address my questions regarding my appointment, she abruptly disconnected the call. Because I was concerned that my appointment had not been properly scheduled, my husband, who is the policyholder, called back shortly afterward to confirm the appointment details. He was connected with Karen again. While attempting to discuss the prior interaction and seek clarification, Karen hung up on him as well. Your phone system states that calls are recorded. Therefore, I am formally requesting that both calls that occurred between 10:30 a.m. and 11:45 a.m. on June 17, 2026, be reviewed and that appropriate corrective action be taken. When I asked to speak with a manager, Karen stated that management was in back-to-back meetings and refused to provide her last name. She repeatedly interrupted us, cut us off while we were speaking, and made no effort to resolve our concerns. Life is stressful enough, especially when dealing with medical appointments. Patients should not be subjected to disrespectful treatment when simply trying to schedule necessary healthcare services. I find it concerning that this type of behavior would be tolerated in a patient-facing role. I would appreciate confirmation that this complaint has been received, that the calls will be reviewed, and that appropriate follow-up action will be taken. Thank you for your attention to this matter. Sincerely, XXXX

Dr Tucker is the absolute best. I went to ER on an afternoon, things happen fast. The Dr put in a…read morepacemaker within 12 hours of my admission. I'll just say I lucked out by the best Doctor ever. He's beyond great in every way.

Tremendous Cardiologist, the absolute best in the business and I have been to eight different…read moreCardiologists in the past!

She may be good. However, they knew my health background. Instead of having me do the medication…read moreIV test at the Orange facility, they put me on a treadmill and put it in almost RUN mode! I had to take a day off work, leave me in limbo as she stated, "I have a lot wrong!" I did poor. "She has 80 90 year olds that could pass that same test!" I may never know. It took me almost a month to get that appointment. Hopefully, when I drop dead of a cardiac arrest, the coroner will tell the world what killed me! I feel I shouldn't have been wasting time on a treadmill. I should have been at the Orange facility with an IV drug that hastens your heartbeat, not wasting time with a test that I was expected to fail to begin with.

After a Visit with Dr Dris in May her office was supposed to make me a follow up appointment in 6…read moreMonths also she requested they make me an appointment with a Dr Giglou to address the edema I was experiencing in my lower extremities, The office was unable to make either appointment I dont know why. I have sent messages through the Patient portal called her nurse who has sent her 2 messages still no response in 3 months. I am very unhappy with the lack of interest this Doctor and PCA have with their patients