I needed a GI badly. I had backed up poop filling me up to bursting. I entered the hospital afraid but expectant. My BP rocketed to over 200 from my panicking. The attending nurse immediately took control. Calming me as the appropriate medication was issued. Perhaps an hour later with her soothing comfort I was once again whisked to surgery. BP stable n under control, what I next remembered was awakening in recovery feeling lots better. Thanks to everyone. read more

Amazing doctors and staff ~ I felt secure and well cared for here ~ They went over and beyond to help me ~

I trust Doctor Jamal and his team from the bottom of my heart, especially because I have trust issues when it comes to medical care. When I temporarily changed doctors and needed an emergency EGT procedure, the other doctor did not handle my care well at all. In fact, I became very sick afterward and ended up hospitalized. Their team was extremely unorganized, and to make matters worse, the anesthesia technician administered the wrong amount of anesthesia, causing me to wake up in the middle of the procedure. That experience was traumatic for me, and I never went back to that team again. I fought to return to Doctor Jamal and his team, and I do not plan on ever leaving them again. read more

very happy with the doctor and the staff and all the crew thank you very much Also, thank you from from beginning to the Finish my surgery read more

If I could give negative stars I would. They sent me to a surgeon who asked for a procedure that they are not capable of doing. So I requested a different surgeon and was told by the office to where I was referred to that they do not accept my insurance. I called immediately And left a message with the girl who answered the phone because she said the person that does referrals was busy. I have since left three additional messages and responded to a text that they sent. I let them know. They did not take the insurance and needed a new referral. It has been three weeks and still no reply or new referral. This place is ridiculous. If they take care of their patients while doing medical procedures, the way they take care of their communication someone might lose their life. I've spent way too much money in copayments and now I have to go back to my regular doctor to ask for a new referral. read more

I received good care. Everyone was helpful and explained the process and texted me information and videos so I can know what to expect. I know if I have a question that I can contact them and get a response soon. Thank you read more

complete garbage service; prepare to sit there and wait 3-4 hours for surgery. in pain? good luck with that, go home. you have anxiety and ptsd? tough luck. your jaw cant open to fit this medical equipment?? lets shove it in your mouth and refuse a pediatric size. this might as well be a veterinary clinic; quality of care? prepare to be treated worse than a rapid rabies infested dog read more

See all

Dr Jamal did an ERCP and stent removal and cleaning of my bile duct. I feel 100% better, no longer experience shortness of breath or lack of energy. He gets a well deserved "atta boy". read more

PLEASE DO NOT USE THIS OFFICE. The absolute worst experience I have ever had with a doctor office. I went to the office in Lake Forest to get a colonoscopy and endoscopy. The endoscopy was my primary reason for going. The colonoscopy was just maintenance. Constant errors at every step of the process including the day of the procedure. They forgot to schedule the endoscopy thus I had to pay $1000 right there in order to get the procedure done. I mean they are so bad, that is it just has to be purposeful. Just a quick a summary: The first appointment which should have been a red flag. The assistant was 60 minutes late. I asked why the delay and she said that is just the way it is and got upset with me for valuing my time and asking. I should have just left but hey it gets worse. They scheduled my procedures for the christmas holiday. I told them I wouldnt be available and they assured me they would call me once my insurance got approved to reschedule sooner. No phone call anytime. So a week before the procedure I had to call and reschedule. I should have cancelled at that time but what a pain. So I rescheduled for March. Mind you still no follow-up from the office. The only phone calls I got was from the surgery center for confirmation. So day of procedure they forgot to schedule the endoscopy. So I had to pay right there and then. I finally met the Doctor. Finally had the procedure in March. It is now June and still no follow-up from the Doctor or office. No phone call. No email. No nothing. Now I am getting bills from Quest Diagnostics, etc. The office gave them my wrong insurance information. So now I have to deal with Quest to try to get it correct. Please, whatever you do PLEASE DO NOT USE THIS DOCTOR OR THEIR STAFF. Like I said they cannot be this bad randomly. It has to be purposeful. read more

This office is in constant crisis mode and expect a 2 hr plus wait if your visit is scheduled in the afternoon. It's so normal that all the patients sit in the waiting area making snarky comments. Avoid getting referred to this office at all costs if you have any self respect for your own time. read more

Ridiculous. This practice lives up to their 1* review. Way to go doctor!!!!!!!!!! We arrived early as instructed to fill out paperwork, continued to wait 2 hours and still no sign of doctor. A couple patients started to complain and ask when they would be seen and then, they got taken in within 15 mins, just like magic. We ended up walking out, without even seeing the doctor. After viewing all the reviews, I now know why. Bravo. read more

Zero stars for this Doctor and office!! My father in law was referred to this Doctor by his primary for stomach issues. He had about 3-4 appts with him, yet he never saw Dr. Jamal. The appts were made assuming that he would see him but he never did. Instead it was some nurse practitioner/assistant. The office even called one time and canceled the appt and rescheduled. When he went in for the appt they asked him why he missed his last appt and that he didn't have an appt that day. They didn't believe him. I don't recommend this office and this doctor to anyone. Why even be a doctor if you don't even see your patients! read more

The very best and most thorough colonoscopy and endoscopy I have ever had. Dr. Jamal is very knowledgeable and has great bedside manner. Anyone who is looking for a excellent gastrointestinal Dr, look no further. Dr. Jamal is truly the best. Thank you to Dr Jamal and his staff. read more

Very unhappy with the experience. From the start to the last appointment to go over results. This was a procedure my husband had and I am extremely unhappy with the doctor and the staff. It felt like the doctor couldn't devote his time to my husband and was not present for the follow up even though my husband requested an appointment to be set while the doctor was present. It took nearly an hour to be seen after the appointment time. I could hear the staff on the phone with others and they were rude. Just not a good overall experience. read more

First time I saw that at a doctor's office they are so unorganized . My mom's appointment was for 3.15 the doctor didn't see her until 4.50 and I talked to other patients 2 other had the appointment for 3.15 and I was shocked. They book several people for the same time. They make you do paper work which is so not in order and then doctor's assistant came to ask what made us visit them. Finally we got to see the doctor that wasn't even in person ,was online was shocking. The appointment took us 2 hrs and was not satisfactory .I totally don't recommend this place. read more

Most of the negative reviews on here are complaints about wait time and staff. I don't mind the wait for quality care. Dr Jamal and Jocelyn, his nurse were both professional and personable. They took the time to listen to my symptoms and concerns and genuinely cared. We're waiting on results from ER tests that were run before he comes up with a plan of action. The front office staff was also very friendly on the phone and in person. If you want a professional Dr who takes time with his patients I would highly recommend Dr Jamal. I bring a good book and catch up on my reading while I'm there. Thank you Oceana staff for your professionalism and genuine care. read more

I recently had a colonoscopy on 3/2/18. Followed the prep per the doctor's orders. Starting with a low fiber diet 10 days before. Stopped eating Wed morning. Only soup and jello. Same on Thurs and started drinking prep at 2 and 6. They called and said to come in at 2:30 on Fri. Now, no food or water after midnight. Needless to say I was miserable when they called me in at 3:45. Procedure was a breeze. As I'm laying in recovery, I hear the nurse tell a patient they had poor prep and would need to drink double the prep and reschedule. Yikes! The nurse now comes to me (BTW: I have yet to ever see this doctor) and tells me the same thing! I lost 6 pounds. I followed this prep to a tee. I was so upset. I did some research. I found if too much time elapses from the last prep to the procedure (now 24 hrs had gone by) your small intestine will produce a mucus that goes to the colon. Long story short, I did nothing wrong! Don't you think the doctor should know this could happen? I hope this helps others who were told they had a bad prep. They want me to reschedule...I think not! read more

I went to Urgent Care and Emergency for extreme abdominal and intestinal pain. I couldn't keep water down without throwing up. I had no appetite being I felt like I was about to explode. I had constipation for a week with no bowel movements. Urgent care said I was dehydrated and needed to go to Emergency or I would die in two days. Emergency did a CT Scan and found out I had a Bowel Obstruction in my smaller intestines and Diverticulitis in my Colon. Emergency admitted for possible surgery. I was in the hospital for four days. My Primary Care Physician referred me to Oceana Gastroenterology to see Dr. M. Mazen Jamal for an Upper Endoscopy and a Colonoscopy procedure, while I was in the hospital. Oceana worked worked with me immediately under these emergency situation. They even called me while I was in the hospital to confirmed my appointment with them. I read all reviews that were posted on Oceana Gastroenterology Associates online and got concern. However being my urgent situation I went ahead to my appointment. When I arrived to their office I entered a peaceful, relaxing and calming atmosphere. I was not disappointed at all with their office staff. They were very efficient, polite and respectful to me as a patient. I have worked at a hospital in Registration Dept. Im very familiar with gathering patients information to enter into the system. I held a position in insurance billing as well. I know how time consuming it is to enter patience demographics. The Front Desk did an outstanding job, they are very polite, efficient and kind. I then went to a medical room and met with Christina Dang, PA. She is very knowledgable on my medical condition and was able to address my concerns. Christina Dang, PA was very Professional in her Field in Medicine. She set up my appointment right away to meet with Dr M. Mazen Jamal to have the Endoscopy and Colonoscopy done. She gave me verbal and writing instructions to prep me for the Corona Summit Surgical Center. She also called my pharmacy to get the medication needed for the procedure. When I worked in the hospital I also held a position as a Scheduler for all testing done in the hospital as well as surgery scheduling. I know how time consuming that can be in coordinating procedures. Christina Dang, PA did an outstanding job! She is very knowledgeable, efficient and polite. The whole office works great as a team. Everyone has their part to contribute to patients care. Oceana Gastroenterology Associates are very professional, efficient and polite. Dr M. Mazen Jamal is highly in demand for his Specialist in the field of Endoscopy and Colonoscopy Procedures. He has a lot of patients who seek to have him do their Endoscopy and Colonoscopy. It's a great team that all work together to make the procedures successful. In regards to the bad reviews posted on here. I would say that these patients have no patience with working with those in the medical field. Anyone who has every worked in the medical field are well aware with how difficult some patients can be to please. People are people and some are just not happy people. So they complain about everything because thats who they are. Those in the medical field know not to take it personally. Some patients have zero tolerance for pain and just take out their frustration everyone. I highly recommend Oceana Gastroenterology Associates! read more

I had a procedure yesterday, performed by Dr. Jamal. I cannot say enough amazing things! I had been hospitalized at Corona Regional Medical Center on an emergency basis, and Dr. Jamal was my specialist.Even int he hospital, he was great! He stayed with me as long as I needed then, and in his office, to make sure i understood what was going on, why, and how he was going to help me get better. From the pre-procedure office visit to the procedure itself, Dr. Jamal and his staff were amazing! I was given timely reminder calls, and they took all the time I needed to get all my questions answered, even the ones I hadn't thought of when I was with the doctor. In short, they were very patient with a patient. My prep routine was the easiest and most comfortable I've ever had (and I've had 3 of these procedures, now.. I'm a veteran!), and the results of the prep were evidently excellent and complete. It allowed Dr. Jamal to "get a good look around", and reassure me int eh recovery room that my results were great, and I am cleared to have my next follow up in 10 YEARS! Nobody wants to have the sort of test that Dr. Jamal performed. But for my future needs, Dr. Jamal is my doctor of choice. He should be yours, too! read more

Dr Jamal has been my GI fo almost 10 yrs now. He was the first doctor to really listen to me. He did the necessary test and found a tumor in my colon. I was then able to do chemotherapy and get back to living my life again. DR Jamal saved my life! The staff always remembers me by my first name and I always feel so welcome. read more

Best doctor I have had. This man saved my life. I went through E.R. visit after the next for nine months, until Dr. Jamal took a look. He worked with my surgeon hands on to directly advise my issues. He visited me in the hospital several times after 13 inches of my intestines were removed. If not for this man and my surgeon, I would not be here.. This surgery was three years ago, I went for a follow up with Dr. Jamal the other day, and he remembered every move we had made to fix me.. he found no issue and I only trust his truth.. never tried to take me for money, ever false. He can be a little stiff at time times but because he's professional. GOOD MAN, EXCELLENT DOCTOR.... Thank you so much read more

I was diagnosed with diverticular disease in 2014, made an appt. with this facility, got a phone call a couple days before to confirm the appointment. I showed up, and they didn't show an appointment on file for me...but they said they'd squeeze me in. I met with the dr. and said I'd call again when I was ready to schedule the procedure. I have since developed another gastro-problem, so I got referral again. Scheduled an appointment for 5/3/2016. On 4/30/16, I received an automated message confirming the appointment. On 5/3/2016, I call to re-schedule because I had a surprise out of town guest, so the appointment person gave me TODAY, 5/16/16. This time I did NOT receive the automated call so, from my last experience with the, I figured I'd call before I drove to the appointment. As I suspected, the woman that was helping me said there was NOTHING on the calendar showing that I had an appointment. When I told her the story of me re-scheduling on 5/3, she was defensive & unprofessional, to the point where she even said, "I don't want to argue"....um...SHE was the one arguing...I was simply telling her that I HAD called on 5/3 and RESCHEDULED. She said they showed me as a "no-show" and didn't have a new date scheduled. Her defense was that "if you HAD called on 5/3, there's NO WAY we would have re-scheduled so quickly." SO...I told her that this was the 3rd time they screwed up on their scheduling and I'd find another doctor. MOst people that care about their clients, or BUSINESS, would state something at that point, please let us make it up to you, we'll get you in ASAP...SOMETHING..but NOPE, just an unprofessional "ok" with an attitude. I'm not sure How well their doctors are, but for me, if you can't get an appointment right, why would I trust you with a procedure? I truly hope Dr. Mohammad Mazen Jamal takes a better look at his scheduling department. read more

So, Dr. Jamal is a second opinion which means he's out of my network which is nothing but a hassle but well worth it. MICHELLE who is the office manager was great I just love her she helped me get through everything. JOSLYN the PA, also great she showed nothing but concern for me very kind and professional. Dr. Jamal did 2 procedures at the Corona Summit Surgical center which was a great the staff was kind and professional and I'm a big baby and they all kept me laughing to keep my mind off things and so CLEAN. Dr. Jamal was kind and got me through it. I will continue to see Dr. Jamal because he listens to you and does everything to find out what's going on. read more

OMG! This is the worst doctor ever! Dr. Jamal only has office hours on Monday afternoons and all other time the patients are seen by a physician assistant (I wonder how you charged my insurance?). We scheduled an appointment on a Monday afternoon so we could see Dr. Jamal, but he was running late for an unknown amount of time so we were forced to see a PA. We had an appointment for an endoscopy and colonoscopy at 11am and we were told that that's the earliest time that Dr. Jamal would come in to do the procedures while other doctors would start as early as 6am. These patients are required to have a 10-day pre-procedure limited diet, a 2-day pre-procedure liquid-only diet, and have nothing to eat and drink midnight prior to the procedure. The patient was so weak and almost past out. On the procedure day, Dr. Jamal didn't show up until 11:45. The patient's husband in the next bed was cussing about it. The Corona Summit schedules 3 patients and all for the same time to have the procedures which I do not understand. These are not simple office visits, and they asked the patients to check in an hour before the scheduled time. It had been two and half hours since we checked in and the procedure had not started yet. Dr. Jamal just showed up and asked if we had any questions. I replied by saying that we just want to get it done so we could go home. He said, "I want to go home , too!". But, Dr. Jamal, I bet you didn't have to have a fast like the patients did! read more

This place is a bad joke the staff is rude they even had the nerve to cancel the appointment as I pulled into the parking lot and make us wait a week for the test results the only way you can see the Dr is one day a week and sit and wait for hours in a waiting room with a rude and abusive at times staff it you wanted to be treated like an insurance card number I recommend this place you get better service and a friendlier staff if you go to the DMV if you love the one your bringing here take them someplace else the Dr does not even know why your there when he comes to the room you would think he would at least check your file before coming in but they don't very disorganized and unprofessional don't waist your time here read more

I was sent here due to pancreatitis. I have had cancer and my oncologist was concerned that this could be a return of cancer. The request was for a biopsy of the pancreas. The N.P. flat out said "we're not doing that." The N.P. requested blood work that took 3 trips to the lab for her to get the request clear enough for the lab to draw the blood. Then it was tests she wanted done. At no time did I ever see the doctor. When the appt was set to get the test results I was told "you're seeing the N.P." In the mean time I saw my oncologist and told him what was happening. He was very unhappy and called Oceana. I got a less than friendly call from Oceana informing me my oncologist had called. They had 3 months, yes 3 months to do something. I hope it's not cancer as I will probably file malpractice if it is. They have taken 3 months of my life to do nothing. My wonderful oncologist pulled some strings and I was seen at City of Hope THE NEXT DAY. This doctor is a joke. The office is garbage. Plan on sitting in their uncomfortable office at least an hour and 1/2 while the staff chats on the phone with friends. They should have a - star choice because 1 star is excessively generous. read more