Andrew Khoi Nguyen

Andrew Khoi Nguyen MD

Specialties:

Gastroenterology and Internal Medicine
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4.6 / 5 (based on 316 Reviews) View 83 Comments

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562.904.4445

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Andrew Nguyen MD MBA is board-certified physician, who specializes in gastroenterology, hepatology and colon cancer prevention. After earning his doctorate at the George Washington University School of Medicine, Dr. Nguyen completed his internship and residency at UC Riverside School of Medicine and received extensive gastroenterology and hepatology training at the University of Utah Health.

Volunteerism is very important to Dr. Nguyen—it’s how he was raised. He pursued a career in medicine as an opportunity to serve his community. Dr. Nguyen is especially drawn to internal medicine and the hands-on interventions that occur in the GI specialty.

“I enjoy the complexity of various cases and endoscopic procedures,” Dr. Nguyen explains. “My patients are unique, and I listen to them to understand how to treat them as a whole person.”

Outside the clinic, Dr. Nguyen likes to spend time with his family and travel. He follows the Lakers closely and enjoys watching and playing sports of all kinds.

Office Information

Hospital/Group Affiliation

PIH Health Downey Hospital

PIH Health Whittier Hospital

PIH Health Physicians

Profile

Gender

Male

Specialties

  • Gastroenterology
  • Internal Medicine

Education

Medical School

George Washington University School of Medicine

Internship

University of California Riverside School of Medicine

Residency

University of California Riverside School of Medicine

Fellowship

University Of Utah Health

Board Certifications

  • Gastroenterology
  • Internal Medicine

Video

Patient Reviews

January 23, 2026
Very professional
January 16, 2026
Yes, I pressed the wrong keys a couple of times. It should have been fours all through. I thought one was no and two was yes, but it was definitely a four. It was a great service. I had no problems at all. Thank you.
December 22, 2025
Dr. Nguyen is very nice.
December 22, 2025
The staff were very friendly, and the doctor in particular was attentive. He explained very patiently that there is a minimal wait, but it's normal because there are patients who arrived before you, but as I said, the wait is short.
December 19, 2025
From the outpatient registration, to getting prepared by the nurses, and finally, getting the colonscopy procedure done, all the staff were on point and attentive. Outstanding work from all!
December 18, 2025
It was excellent.
December 09, 2025
I had a colonoscopy performed, yet the printout of the prep for the colonoscopy was totally different than what the doctor wanted done. For instance, it didn't say to fast for 36 hours, the printout. The printout even stated I could have a light breakfast the day of the procedure. I didn't, but I had eaten the day before at 1 p.m. So now the provider said that he needs to repeat the whole colonoscopy because the prep wasn't done correctly, which I think is very, very, very unfair because it is not very easy to drink that stuff. And had he said to fast, I would have fasted.
December 05, 2025
(Name removed), Ahn are amazing! It was actually fun talking with then!! Kudos to the entire team! This was my 4th colonoscopy, the first one at PIH and I would never go back to the three other facilities. ?????
December 02, 2025
Such friendly and professional staff
November 25, 2025
(Name removed) también.
November 21, 2025
Yes, the staff is very friendly, courteous, and attentive. I would definitely recommend the center to my family and friends. I'm very grateful and they treated me very well. Have a good day and keep up the great work! Thank you. Bye.
November 21, 2025
The service was great every one was great thank you all
November 17, 2025
I wouldn't schedule a f/up appointment with this dr.
November 14, 2025
I was treated very well. All the nurses were very, very caring and I trusted them and the anesthesiologist. Everybody was really nice to me and thank you.
November 12, 2025
Everything was mostly a great experience. The only thing that is disappointing is that insurance companies/board of directors seem to be running the patient care instead of the medical professionals. This is happening everywhere. Doctors, whether specialists or PCP's are given tight time constraints with the patients. The patient has no time to provide a background to the medical professionals as to why and how the patient arrived in the condition they are seeing the doctor in the first place. I have a lot of history that they need to know so they can make informed decisions about care. But every doc I've visited in the past 10/15 years has 11 to 20 minutes to see and evaluate the patient, get paperwork done, and move like robots all day long, with time limited fragmented histories. I think it's time for the board rooms to get out of the exam rooms and let the doctors do what they need to do.
November 12, 2025
I did have to wait for a while to be seen by the doctor, but his attention towards me made up for the time I waited. Dr Nguyen gave me quality time. Thank you Dr.
November 11, 2025
Very good care.
November 10, 2025
Had to wait 45 minutes past my appointment time to be seen.
November 03, 2025
Keep the good service going
October 31, 2025
The service was excellent everyone is very professional; I was very happy. Thank you.
October 28, 2025
Everyone was very attentive and kind, thank you.
October 22, 2025
Very nice experience, Doctor very kind, listens to your questions, I would recommend this Doctor to my friends.
October 16, 2025
Very friendly and kind caring.
October 13, 2025
Doctors follow up our health problems efficiently
October 13, 2025
Staff and doctor were very respectful and very helpful
September 23, 2025
First time meeting the surgeon was right before the procedure. I was referred by my primary, Dr. (name removed) in Cerritos. Everyone involved with me was very respectful and responsible. Thank you.
September 19, 2025
The staff was upbeat and personable. They truly made you feel safe and comfortable during your procedure.
September 16, 2025
Setting appointment was a nightmare waiting for appointment was crazy but the only positive was the staff you have at the hospital was amazing from intake to pre op to post op every single person nurses doctors and staff I would rate a 10 plus. Very friendly and seemed to enjoy what they did.
September 11, 2025
Doctor was very informative and helpful. Great doctor.
September 05, 2025
I was very comfortable with my Dr. Nguyen and Dr. (initial removed). My nurses that took very good care of my stay was (name removed), (name removed) also Tech, (name removed) CNA (name removed)... Very Professional, I highly recommend them... Made me feel safe and comfortable...
September 05, 2025
All of the staff at PIH Downey were wonderful. Dr Nguyen made me feel very comfortable with the procedure. All of the nurses and techs were fantastic.
September 04, 2025
I hope the Dr's experience was as positive as mine
August 27, 2025
I found this doctor's office to be very unorganized. I wasn't impressed at all. I waited over a year to visit this doctor. I filled out the registration online, called the day before I went to make sure everything was ready, they had all my information, and I was quickly told, oh yes, oh yes, of course. They always get it prepped before the, patient comes. When I got there, they didn't show that I was registered. And when I got in the office, they kept on asking me questions that were in my medical file. And they had not pulled my medical file like I was told that they had. I waited over a year to get in, and they were not prepared for me. They actually walked over to my regular doctor, Dr. (name removed) office, and pulled the paperwork while I was in the office. No, I would not. I don't even feel comfortable about getting the scope done with this doctor, to be honest with you.
August 25, 2025
Well, the doctor said he was going to call in a prescription for me, as did the other one, the PA or whatever positions, (name removed). And she didn't call it in either, so neither one called it in, but I've been expecting it. I called the office today. They're going to put a question out to find out about it, I guess. So anyway, that's my response. Thank you.
August 07, 2025
I love how the staff and doctors show you compassion and treat you with kindness.
August 05, 2025
Everything very professional.
August 04, 2025
Didn't like the process of scheduling my next appointment. No discussion about availability, just given a date and time and asked if it was OK.
July 30, 2025
Doctor has been able to understand my health issues. Has done good so far..
July 24, 2025
I initially called to get an appointment. They had to set it for three months out. We went ahead and set that appointment and then called back later asking if we could get on a cancellation list so that I could be seen sooner because I had been recommended to see that doctor by the emergency department. But you have to wait for three months to see the doctor when you're concerned about an issue really seems ridiculous to me. We should be able to get in within a month at least. But that's it. That's the only feedback regarding that. Thank you. Goodbye.
July 22, 2025
Great Patient Care..Thank you!
July 21, 2025
Dr. Andrew Nguyen was unprofessional and didn't show up in a timely manner. He had me waited for about 50 minutes in the room before he was able to see me. He's only spent one minute with me then walked out of the room. He didn't get a chance to review my ultrasound test result, which I had it done a month ago and asked me to wait in the room saying he needed to access ultrasound test result from another office. So I was waiting for another 15 minutes, but he never came back to see me. Then a staff came in the room and told me that I can leave, but I told her that Dr Andrew Nguyen needs to go over the ultrasound test result with me. She said the doctor is seeing another patient, so I was very disappointed and told the staff not to reschedule the appointment with this doctor again, then I left.
July 18, 2025
The nurses and the entire staff treated me with great care. Thank you very much.
July 17, 2025
The doctor was very personable.
July 16, 2025
The doctor was very knowledgeable of what is going on in my situation.
July 15, 2025
The appointment visit over all was amazing from my arrival time to checking in my nurses are wonderful my favorite over all was Nurse orchid she explained everything to me. She read my information to me because at the time I didn't have my glasses I couldn't see she made sure I made it home safely. She told me to call and when I called to let her know I made it home she felt more comfortable Dr. Nguyen very awesome. Had a great experience. Thank you.
July 14, 2025
I am satisfied with service
July 09, 2025
everyone was very nice
July 07, 2025
(Name removed) in the front was very helpful, very patient, extremely professional, pleasure to speak with her. (name removed), who took my vitals, amazing person, very helpful again, very professional, made the experience even better, because I get nervous with the blood pressure readings. Great personality, awesome office staff. Thank you.
July 03, 2025
The only thing was that I had an appointment for a certain time, and they saw me after about 45 minutes. It took them a long time to see me.
June 25, 2025
I appreciate the provider's time, but I do wish more of my daily activity restrictions had been included in my medical notes. I brought in documentation to help explain the ongoing difficulties I've had for over two years-such as only being able to stand for about 15 minutes at a time before needing to sit or lie down due to pain in my feet and abdomen. I also shared how my condition affects my reliability-for example, I can no longer consistently attend family gatherings or keep medical appointments. Including these details in my records is very important for accurately representing my condition, especially as I seek Social Security Disability support.
June 23, 2025
I had an appointment scheduled for 9:45 AM on 06/24 but I was not seen by the provider until 10:45 AM - a full hour after my scheduled time. I understand that occasional delays happen, but this level of delay, without communication or consideration for the patient's time, is unacceptable. What's especially frustrating is the double standard: patients are often required to arrive on time, and appointments may be canceled if they are more than 15 minutes late. Yet in this instance, I was expected to wait an hour without any accountability or explanation. I would appreciate more transparency around delays in the future, and a fairer policy that respects patients' time as much as providers'.
June 16, 2025
I want to see another gastroenterologist. Dr. Nguyen didn't give me another appointment. I had to ask the nurse when I would need to come back, and she brought me a note from Dr. Nguyen to see a nurse practitioner in December. Of course, I'm going to cancel that appointment.
June 04, 2025
Many thanks to PIH for maintaining excellent, professional, friendly, and trustworthy doctors. I am very grateful and again, thank you very much.
June 03, 2025
The doctor responded to a concern I had about preparing for the procedure and some medication adjustments. This was indeed greatly helpful and appreciated.
June 03, 2025
I went to the wrong hospital (word removed) Whittier by mistake, I called PIH Downey gi and explained what happened and they were able to perform colonoscopy even after arriving an hour late
June 02, 2025
Well, I think I've done everything on my own, the exchange that Doctor did has given me results. For me, it's very likely that I can recommend other people, because they've treated me very well, so for me, what I've received from them so far is perfect.
June 02, 2025
All around it was great. I got there early anticipating a crowded waiting area and extended wait But was pleasantly surprised with the efficiency and timely efforts of the office. I had expected an extended wait but was called in right on time
May 30, 2025
Thank you for having employees who speak my language and are also attentive and intelligent.
May 16, 2025
They treated me very professionally and very attentively.
May 13, 2025
It was a pleasant experience
May 12, 2025
At my last appointment, I came in as a referred patient specifically to discuss symptoms I believe are related to lactose intolerance. Still, I left feeling like that concern wasn't fully addressed. I didn't receive a precise diagnosis or a treatment plan other than taking an over-the-counter medication like Lactaid, which I already know about. I left the appointment with information for blood work and ultrasound that was completely irrelevant to my concerns. I've waited close to 2 years for a proper diagnosis or treatment and did not receive that. I wanted to get clarity about whether I'm lactose intolerant and what steps can be taken to figure it out, but I'm at the same point as I was before I started seeing multiple doctors for this. This lack of care for my concerns is unacceptable. I will be sending a message to this provider as well.
May 09, 2025
All the staff are very friendly and attentive to the patients.
May 07, 2025
I had a 4 month followup visit with Dr Nguyen. I was very pleased with my results with him. I will be having blood tests with Dr (name removed) my hematologist. Dr Nguyen will use those results to determine what I further need in my next 4 month visit. Dr Nguyen always listens. I am very pleased with Dr Nguyen.
May 07, 2025
Dr Nguyen was excellent and provided personal an very professional care
May 05, 2025
Everything is fine.
April 28, 2025
Friendly and above average office staff, first impressions were positive. Doctor was professional and polite.
April 17, 2025
Two things. One, my first answer, I actually answered it correctly. It was very easy to get an appointment. It took a long time, but not just to schedule, not they were so far on their schedule (INAUDIBLE). I also wanted to commend the staff because I got my referral and the medicine that I needed to take within just a couple of minutes after leaving the visit. That's very commendable. I have never seen that. I think I was still in the parking lot when I received notification from my pharmacy. I want to commend the staff for (INAUDIBLE).
April 17, 2025
Thank you.
April 15, 2025
The staff were very helpful and understanding of my needs
April 14, 2025
I was treated very professionally from the moment I arrived until I left, everything was very good and I am very, very happy.
April 14, 2025
very nice, friendly and sincerely. Dr. Nguyen answered all my questions and concerns.
April 09, 2025
we have a lot of respect for doctor, he appears to be very knowledgeable!
April 09, 2025
I appreciate the care and professionalism shown by the staff during my recent visit. I had waited a long time to be seen by the provider and had called daily in hopes of finding a cancellation. Fortunately, I was able to be seen months earlier than my originally scheduled appointment. However, the intake session did not provide any new information, as I had already received the same guidance previously. I now face an additional three-month wait before the next step in my care, which is disheartening given that my symptoms have continued to worsen. I believe it would be beneficial for patients to receive basic GI-related information during their general care visits, or to be directed to complete certain tests before their specialist appointment. This would help ensure that the referral process is more efficient and that patients do not face unnecessary delays in treatment. While I'm grateful for the kindness and professionalism of the staff, I am hopeful that I can secure a timely follow-up appointment so that my care can move forward. I hope PIH can hire more GI doctors in the future to help patients
April 07, 2025
So the doctor was great. He even prescribed me something that I asked for my traveling to Vietnam. He spent a lot of time with me and I was very happy and satisfied. I felt that I was heard and he listened to me with patience. I appreciate his time and I'm glad that he was my provider. Thank you.
April 01, 2025
Great team for my out patient colonoscopy procedure
March 27, 2025
Extremely polite, respectful, informative, professional, patient!, knowledgeable! Very satisfied with my initial visit and pending medical procedure!
March 25, 2025
Great team!
March 24, 2025
Dr Nguyen was so awesome,he was so friendly and helpful for me and and all my questions and gave me answers that I could understand and not medical terminology that involves my problem...we need more like him.. understanding and compassionate...
March 21, 2025
Thank you very much for your kind attention!
March 12, 2025
Very helpful.
March 11, 2025
Provider and all the staff were very professional and helpful
February 25, 2025
The entire staff was very courteous, professional and set an example of how health care should be provided
February 07, 2025
Good
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