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    Yoon Gene MD

    4.1 (8 reviews)

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    3 years ago

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    5 years ago

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    4 years ago

    Tried calling the office 6 times over 2 days. They never picked up. Stayed on hold for 15-20 minutes each time.

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    9 years ago

    I have been going to Dr. Yoon for many years. He is an excellent physician, and has always been thorough, helpful and informative.

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    12 years ago

    Best Gastroenterologist I have ever had (I've been around a lot of them.) Good guy, knows what he's doing.

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    9 years ago

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    12 years ago

    Dr. Yoon is the best gastroenterologist in Fullerton. He is very knowlegable and has great bedside manners.

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    10 years ago

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    Upper Echelon Medical

    Upper Echelon Medical

    4.9(52 reviews)
    0.6 mi
    Established in 2021
    Locally owned & operated

    Medical doctors are inundated with an overload of patients, so of course one's needed medical care…read morefalls by the wayside. I'm 74 years and have changed doctors numerous times because I am not only a holistic health care practitioner myself but also avoid medications unnecessary for me. I agree that in dire situations medications are needed for a temporary fix. Dr. Marisse is the first doctor who I so appreciate and the time spent with me on my first evaluation visit I have never experienced with any doctor. 1 hour wow! She truly is an asset to her professional she truly cares about her patients too, I have found my forever primary care doctor who truly understands what my needs and desires are, she get an A++ in my opinion. Her office staff is also exceptional too! Very professional and helpful! I would highly advise anyone looking for a doctor that has their best interest to go for a meet and greet with Dr. Marisse Herrera, you won't be disappointed!

    I just started my membership with Dr. Marisse and her lovely staff, including Shawna and Kayla…read more They are all so wonderful. I love how quick they are. My first appointment they were all so kind and sensitive. Dr. Marisse listened to my ranting patiently, lol. I also joke a lot, and they laugh at my jokes - they are very down to earth, yet educated and professional. They made me feel welcome from the start. Dr. Marisse is very educated. Our first appointment, and she provided me more information than any doctor I had before her. I do appreciate and like how she is very thorough, especially wanting to get to the root cause of the issue and explaining alternative ways we can heal our parasympathetic nervous system. I had never heard of that before, but I did my research afterwards, and I knew she was more than just a regular doctor. The next day, they scheduled blood work, and again, they were very quick. I was in and out without any waiting. It's not something I'm used to. I do love that they have upfront pricing, unlike insurance companies that can give you surprise bills after your visit. I look forward to working with them on my health journey. I am excited to see how I can heal myself, especially with the health concerns that I've been struggling with for many years. Dr. Marisse and her team are very special! I'm very inspired, motivated, and determined to get my health on track and to take accountability for myself with their medical expertise.

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    Upper Echelon Medical
    Upper Echelon Medical
    Upper Echelon Medical

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    Daniel J Kim, MD - Dr Daniel Kim.... great guy!!

    Daniel J Kim, MD

    3.4(15 reviews)
    0.1 mi

    Avoid this doctor Kim, they are the worst, make sure to ask how much they will charge you prior to…read moredoing any check ups or treatments. For 1 day only, they charged 936 dollars, before insurance charges. My insurance was able to pay about half the price, but still it's an unreasonable amount. They denied telling me the prices, and I found out at the end the prices after my check up, and it was crazy. Make sure to triple check all the charges prior to taking any treatment. The lady on front will most likely tell you that they don't know the costs, since they need to check with your insurance first, so make sure to ask how much everything costs prior to insurance covering. It is a ridiculous amount that no one should pay for.

    I originally chose Dr. Kim as my PCP because of the rave reviews he had on Yelp and on Google…read more Unfortunately, my experiences with him were less than stellar. At my first visit with him, he rushed me through my general physical and talked *at* me rather than *to* me. I tried to talk to him about what I thought was a food allergy, and after I described what I was experiencing, he said, "if those foods are bothering you, then just don't eat them." I was kind of baffled by that. "Yes, of course," I agreed,"but I'd like to know if I'm truly allergic or not." His response was: "I can send you to an allergist, but they're really not going to be able to test for that." I suggested seeing a GI doctor; but his response was the same: "Waste of time." Oh, and he did all of that at the top of his voice in a quiet office. Thanks. I appreciate a doctor that can tell me the truth without the sugar-coating; but after getting a second opinion (which suggested I do see a GI to *confirm*), it was clear that Dr. Kim really didn't have time for me. The only upside to seeing this doctor was his outstanding office staff. PS. St. Jude Medical Ctr charges for parking in 30 minute increments, which is just plain mean.

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    Daniel J Kim, MD

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    Nitta Douglas MD

    Nitta Douglas MD

    2.4(17 reviews)
    0.1 mi

    *Always on "vacation" *Never takes the time to really know…read morewhat's going on with you *Never gives any useful advice *NEVER FOLLOWS UP I've been a patient since I was kid and growing up I never liked the way Dr. Nitta conducted his visit it's like your in and out in 5 minutes and he doesn't even do a full on check up to see how things are. The nurses at the front desk are nice and have always been nice it's just this doctor like I don't know if he knows what he's doing or if he just simply doesn't care about people and it's sad because most if not all doctors are just in it for the business and not in it to too really take your health seriously and help you find out the best treatment/cure for whatever health condition you have. I'm tired of hearing "your okay" or "you'll be fine" like I'm not okay my body doesn't feel fine I'm in pain, I'm sick and what are you doing about it?? NOTHING.

    4 stars for Dr. Nitta and 1 star for the office. If you want results, you need to basically harass…read morehis office staff, which I don't want to do. I have had an appointment 5 weeks in advance. They canceled 10 days before, so I called back, left a message, then another message with someone who said they'll call back. No call back. I called again and they said that have an opening in 6 weeks, but only a few spots; otherwise I'll have to wait much longer. This isn't the first time. Also, if you need a specialist or recommendation, it might take 2+ weeks for them to get back to you (with you calling at least 3 times to remind them). If they say they'll call you, never expect a call back. Dr. Nitta is great, always listens and does his best to help. I recommend him, but I can't jump over several hurdles to get an appointment, specialist or basic help anymore. I understand the office can be busy, but there is a difference in being busy and having an absolutely apathetic response to patients.

    St Jude Heritage Medical Group - People waiting inside since they opened

    St Jude Heritage Medical Group

    2.6(29 reviews)
    0.1 mi

    This review is for the office to donate blood .Stay away far far away this place is a joke they…read morejust keep taking people in all day long not caring how long you wait. First our paperwork said they open at 0730 and it's only walk in only no appointments So I arrived when they opened and already 25 people waiting and some had appointments I ask the gentleman at the office he said some of people make an appointment my chart but they don't tell you this when you call them. So if you walk in they just keep pushing your name back in line. After almost 2 hours I finally got in for a 3 min blood drawn . They should tell people when you check in it's going to be at least 2 hours and you will get pushed back by appointments first. It's like everyone that works in this office have and attitude and or unhappy no smiles at all maybe they shouldn't be working with people or they have been doing it so long they hate everyone. Just go somewhere else save your sanity

    Doctor Jeniffer LU is the WORST doctor i have experienced. ESPECIALLY HER PA HEATHER HSIO. She was…read morethe RUDEST doctor i have ever encountered in my life. It takes HOURS before you can get a response back from any provider. I called 8 times before having to drive to their office on my lunch hour ONLY to hear that Dr Hsio didn't want to sign my clearance for a dental procedure i was getting. IT TOOK THAT LONG TO TELL ME ONLY THAT? what kind of Doctor is that. Heather Hsio is the most unprofessional doctor ever & ACTS LIKE A CHILD. The staff and also the office manager was RUDE. never will i come back to this office again. I already changed my PCP the moment i walked out of this office.

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    St Jude Heritage Medical Group - Full office since opening

    Full office since opening

    St Jude Heritage Medical Group - Lines outside people waiting

    Lines outside people waiting

    St Jude Heritage Medical Group - Line just to check in

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    Line just to check in

    St Jude Heritage Medical Group

    St Jude Heritage Medical Group

    2.8(41 reviews)
    2.0 mi

    Plenty of patient parking…read more Clean building/office. There are different departments in this building. Lots of patient seating area in Suite 200. Easy to check-in. Have to check in 15 min before appointment. And then wait 10-15 min after your appointment is when they call you. While the assistant takes your weight and do the health history questionnaire, you have to wait more time for the doctor to come in your room. Appointment at 11:40, came there 11:15, they called me 11:55 and then waited for doctor in the room for around 12:15. Bring your own water bottle; they don't have water fountains or water for patients to drink while you wait. They don't have walk ins for lab anymore. I fasted cuz I wanted to do lab after doctors appt. Have to be appointment only now. St. Jude providence sold their lab to LabCorp.

    I really like st. Jude before, recently not su much and made me feel even stressed just to have…read moreappointments with them. This year, I changed my PCP from Jennifer Lu, MD to Angelina Sidharta MD. Since then, this becomes miserable experience with St.Jude. The 1st time, there's an opening and I scheduled appointments since my leg was in pain. That was happened on Friday and Monday I took day off since it was still in pain and Tuesday for doctor appointment. In the morning of the appointment, they called me if they need to cancel my appointment and reschedule. The been calling me since then to reschedule. How convenient for them! Today, they called me again. My husband and I have doctor appointments tomorrow and only within 24hrs they called and mentioned for my husband insurance if not assigned to Dr. Sidharta and need to reached if I don't have registrations changed notification from his insurance. I'm at work and this makes me crazy since I'm not able to work because of this whole situation. Only notified patient within 24hrs. How very convenient for them. The assistant name is Josiah, the one kept calling me. St. jude, I know you can do better.

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    St Jude Heritage Medical Group
    St Jude Heritage Medical Group
    St Jude Heritage Medical Group

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    Yoon Gene MD - physicians - Updated May 2026

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