John Lah MD
John J. Lah

John J. Lah MD


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4.6 / 5 (based on 530 Reviews) View 122 Comments

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Office Information

Hospital/Group Affiliation

PIH Health Whittier Hospital

PIH Health Physicians








University of California Medical Center (Irvine)


University of California Medical Center (Irvine)

Medical Education

New York Medical College - Valhalla

Board Certifications

Gastroenterology (Sub-Spec Cert)

Internal Medicine (General Cert)


Patient Reviews

July 16, 2021
DR. Lah was very professional,kind and caring of the situation. He was able to help me understand what needed to be done and made me feel comfortable and that everything would be fine.
July 16, 2021
Office staff friendly and responsive. I was treated well and made comfortable. Thank you.
July 14, 2021
PIH doctors are the best
July 12, 2021
This is the best doctor that I have ever had, he took care of me very well. I like you very much and I recommend it to anybody. Dr. Lah is a good doctor. From 1 to 10 I give him 100. I would like to see him again. He took care of me. Okay, that's all I got to say, bye.
July 06, 2021
The Doctor and his staff were very professional in handling my stay at outpatient surgery.
July 06, 2021
I continue to be very happy with the care provided by Dr. Lah and his staff.
June 30, 2021
June 29, 2021
The Drs and Nurses made it a very comfortable experience.
June 29, 2021
Staff was super! Very friendly & professional! Probably the most amazing experience I've ever had with any health care provider!
June 28, 2021
Professional, efficient, concern and respect shown to patient
June 22, 2021
The entire staff throughout the process of making the appointment, providing documents for the preparation, reception and pre-op, the procedure, and discharge was friendly and professional. No questions were left unanswered. Everything went smoothly. My thanks to everyone involved for an efficient experience.
June 22, 2021
Wonderful doctor and nice staff
June 21, 2021
The staff was very, very helpful, especially the doctor but especially the nurses that took care of you and explain everything that was going on. Monitoring temperature and heart rate and everything. They did an excellent job. I really liked all the caretaker's that were taking care of me and they do quickly professionally and I was in and out within a few hours. I thank you very much.
June 18, 2021
Dr Lah is extremely knowledgeable, explains everything clearly, personable, totally makes you feel important and well taken care of.
June 16, 2021
Dr Lah and his office staff is very helpful and friendly
June 15, 2021
Dr Lah is always very thorough, explains everything and takes the time to make sure I understand, which is why I know he cares.
June 14, 2021
Everyone was very friendly and professional. Made me feel comfortable.
June 14, 2021
The whole experience was well explained and the prep was so concise that no problem in following what needed to be done for the colonoscopy.
June 07, 2021
The door is one of the finest men I've ever being to, this is the second time I had to visit him, and he is first class, World Class.
June 04, 2021
Someone needs to answer the phone. I have experience been on hold for 30 minutes. And the nurse assistant, do not transfer my blood test results, the test request, to Quest. As she promised I have to go by your office to re-request. Thank you.
June 04, 2021
She was a very well, thank you so much for your help. We understand everything you say to us. We really appreciate what you did for my husband. Thank you very much. Bye.
June 02, 2021
June 02, 2021
Dr. Lah is very caring and listens to what you have to say. He explains everything thoroughly.
June 02, 2021
This was my first meeting with Dr. Lah and it was most satisfying. He explained results and listened to my concerns. I was very impressed and look forward to receiving treatment from Dr. Lah in the future. Thank you!
June 01, 2021
Professional, competent, friendly, welcoming.
May 21, 2021
I really appreciated the time Dr. Lah spent with me. He answered all of my questions and made me feel comfortable with the upcoming procedure.
May 18, 2021
Very professional and knowledgeable care. I had no concerns about my safety or well being.
May 18, 2021
It was quick and painless.
May 17, 2021
Staff are great.
May 05, 2021
Dr. Lah always talks to me so that I understand and always asks if I have any questions and if I understand. He is not rushing to get rid of me as I've experienced in the past
May 05, 2021
great doc
May 04, 2021
The nurses was very professional.
May 04, 2021
ALL staff from top to bottom, especially the nurses & technician treated me with respectful & loving care. I was extremely comfortable in a nervous-type situation.
May 04, 2021
Every staff member was friendly and professional. I was treated kindly. I was asked many times if I needed anything. Though a colonoscopy is not a pleasant experience, the staff made it very comfortable
May 04, 2021
I was disappointed in the outcome of the procedure. Dr. Lah, did not see me after the procedure was done. I haven't seen him since I first time coming into the room and which I was in. Otherwise he did okay.
May 04, 2021
PIH is the Best.
April 30, 2021
Dr Lah is a very respectful and caring physician. I trust him fully.
April 28, 2021
I trust Dr. Lah completely with my care and have recommended him to others.
April 27, 2021
I'm glad they're in my community.
April 26, 2021
I was very impressed with the the doctors and staff, everyone was kind, friendly and attentive to all my needs.
April 20, 2021
Yes, they were very professional and very helpful. I was very happy with what the test.
April 19, 2021
Colonoscopy is not a easy prep and experience not fun to go thru but all medical staff were super. Very efficient and caring.
April 19, 2021
Nursing staff is excellent!!!
April 16, 2021
I was completely satisfied with my experience at the recent visit. I left feeling very positive about my encounter.
April 14, 2021
Very Good
April 13, 2021
I never saw Dr. Lah before the procedure, so, I typed a short note to him, and some questions, I did not expect him to answer my question right away, so, he was not very happy and told me those questions are the office visit. why I gave him those? I felt sad and disappointed before procedure, but maybe I should not gave him any note. I understood all the doctors are busy, but I had many times procedure before, all the doctors will arrange to see me after procedure. So, when you questions me: did provider spend the time with you, I will say "Not AT All."
April 02, 2021
He is one of the best drs I've ever had. He takes the time to explain and answer all questions. I just can't say enough good things.
March 31, 2021
Appt with doctor was amazing. Very good experience.
March 17, 2021
I felt very safe in the office with the pandemic protocols the office has.
March 15, 2021
Staff was wonderful!
March 12, 2021
Dr Lah is very professional, thorough , and easy to understand. I am very pleased that he is my doctor.
March 09, 2021
Im very happy with all the supports before and after the procedure.
March 09, 2021
All personnel I came in contact during my procedure were great. Kind and very helpful.
March 09, 2021
Overall it was a great experience with the provider. All nurses were professional and friendly that made my visit quite "enjoyable" even for colonoscopy!
March 08, 2021
All nurses that help me were fantastic. Helpful and courteous Thank You
March 08, 2021
At the office staff and all the nurses every person I interacted with was exceptionally helpful and I can't say enough about how how well I feel they did their job.
March 08, 2021
My scheduled colonoscopy was very important to me at this stage in my life, and I felt very confident in the provider of choice in addition to a physician, and the staff that was in the room supporting the procedure. Once again it was a very, very quick experience, and very concise, as well as very positive the outcome. So, for the most part I wanted to thank you everybody on that team, as well as a staff, and the front office all way to those that took care of me in the ready room, and say yes, I've already recommended two other people that were okay for their first colonoscopy use, please be sure to schedule, you know, it's so important. Okay. Anyways, thank you.
March 03, 2021
The appointment process was extremely confusing. First scheduled for me to be available at 2:00pm but Dr Lah would not come on the telephone until after 3:00pm. So I had to wait and hour for Dr. Lah to call me? Is this because Dr. Lah's appointments are over scheduled or they over run the time? I was then called by PIH and told that Dr. Lah would not be able to be on the telephone until 5:45pm. Then it got changed to 4:30pm. Well Dr. Lah called me at 3:15pm and I was totally caught off guard doing something else, but stopped to take Dr. Lah's call. So much for the digestive health scheduling system
March 03, 2021
Dr. Lah was very clear and gave me knowledge to stay healthy. Always courteous and informative. Thank you for your service!
March 02, 2021
Great nursing staff
March 02, 2021
The office staff was very helpful and polite. The nurses are angels. Dr Lah is the best of the best
March 01, 2021
Yes, I had never met my doctor before and she seemed to be very knowledgeable and very accommodating. And I got an appointment really fast, so I'm very grateful. Thank you.
March 01, 2021
Your staff continues to provide professional & friendly service. What a great team of employees you have.
February 24, 2021
I trust and respect Dr. Lah. He took me on when the dr. I was seeing, left to advance himself. He has always answered my questions and understands where I am coming from, in regard to the future. Thank you for asking.
February 22, 2021
Overall was very pleased with the service especially the nurses. Did the interview questions very professional very compassionate. The rooms all the equipment everything seemed very up to date and clean the room overall. I just wish that Lah could have spent more time in bed, you know still very very groggy from the anesthesia, and it's just very difficult to get up at a point and and move out as quick as possible. But I understand the reason you got to vacate the beds for the next patient, but that's a little bit difficult to deal with, and overalls, that's fine. Thank you.
February 22, 2021
everyone that I encountered was professional , courteous and efficient manner which I really appreciated.
February 22, 2021
Everyone !!! starting from the time I walked into the building until the time I left everyone was kind and polite we need a lot more people like them. The staff made me feel at ease right before my medical procedure. Thank You
February 19, 2021
Dr John Lah is an outstanding physician! I would trust him with my life (which I've actually done). I've seen Dr Lah multiple times over the last few years, he seems to really know his stuff and he has excellent Dr/patient skills. Highly recommend.
February 17, 2021
I am very happy with the medicare given by Dr. Lah.
February 16, 2021
The entire staff from check in to check out were all kind, courteous, & respectful.
February 16, 2021
Procedure was completed very professionaly.
February 08, 2021
February 05, 2021
My experience was great as usual, but while in the waiting room another patient came in who had spoken with somebody over the phone who promised his medication sample would be ready upon his arrival, but it was not and he was forced to wait while on his lunch break. As someone who has been in that same situation (but not at this practice) I completely understand his frustration and would hope the staff would work better to avoid situations like this.
January 29, 2021
Dr.Lah truly listens to his patients no matter our age.??
January 27, 2021
Great Doctor and staff.
January 25, 2021
Doctor and staff were very professional, made me feel very comfortable. Thank you all for your help.
January 20, 2021
Dedicated to finding out what he can do to help make sure that all goes well with treatment for my sickness
January 07, 2021
Dr. Lah is one of the best doctors I have ever met I appreciate him and his staff so much
January 06, 2021
my, Dr Lah always returns my calls in a timely manner and I never have to wait long when I have an office visit.
December 30, 2020
Needs to work on therapeutic approach of communication.
December 23, 2020
Dr Lah is very patient and explained things to me so I could understand
December 22, 2020
I will let them know that the service was very good in my case and it was very courtious and respectful from all the staff in PIH
December 22, 2020
December 21, 2020
A very positive experience. Staff was very friendly and efficient. Facility was exceptional.
December 09, 2020
Great Dr. Want to keep me safe and not prescribe any medication that could have I'll long term affects.
December 09, 2020
I have recommend 2 people to Dr Lah so that should say a lot
December 08, 2020
December 08, 2020
Excellent service
December 07, 2020
I found everyone involved, with this procedure, from entering the office early on, till it was over and I was out the door to be very kind and attentive.
December 07, 2020
Don't charge patients for parking. You can validate their parking if you don't want to offer everyone free parking.
December 02, 2020
Very knowledgeable, friendly and professional doctor. Office staff, both front desk and back office are efficient and friendly. I feel well cared for and couldn't ask for better service.
December 01, 2020
Two thumbs up
November 30, 2020
Thank you so much
November 18, 2020
One feels confident and in good hands.
November 18, 2020
Very nice person
November 16, 2020
Positive feedback
November 11, 2020
He was very knowledgeable about me and my history.
November 09, 2020
I've had multiple procedures at PIH and this is the best facility in all aspects in the area. I feel 100% comfortable here.
November 09, 2020
I've been telling my family and friends that PIH is a great Hospital and that I had great service there
November 03, 2020
friendly and professional
November 02, 2020
The Digestive Health department, for all those whom I came into contact with, were professional and courteous. I knew what to expect and everyone fulfilled all of those expectations. The facility is well maintained and clean - again, just what I would have expected.
October 26, 2020
Bed side manners second to none awesome staff !!!!!
October 21, 2020
He is a great doctor
October 19, 2020
Go somewhere else besides PIH if you want quality service.
October 16, 2020
PIH Health has been great... I would recommend them greatly.
October 16, 2020
Dr lah listens to you and answers your questions. I would recommend him but be prepared to wait to see him.
October 15, 2020
The nurse and Dr. Lah both were very kind and listened and explained things. The front office has very little patience especially when you call on the phone to make an appointment or have a question.
October 07, 2020
I too have seen this provider so I was pleased that my husband was able to see him. He is patient, listens and then recommends a plan of action.
October 07, 2020
I feel confident in the expertise of this provider and trust the answers I get to my questions. They can usually put my mind at ease and provide pertinent information.
October 05, 2020
Dr. Lah has a perfect balance of caring and expertise. His calm and professional demeanor helped me tremendously during my diagnosis.
October 02, 2020
I value that dr knew my history before coming into my room. He showed knowledge, respect & care.
September 30, 2020
Good doctor doesn't rush through visit explains everything.
September 29, 2020
Great staff very easy to talk to & answered all of our questions.
September 28, 2020
The procedure, colonoscopy, was easy and the medical staff took the time to help relieve some of the apprehension that a patient may have. I felt that everyone was kind and very considerate.
September 23, 2020
this provider did all ok
September 21, 2020
Don't hesitate when it comes time for a colonoscopy. Early screening is key to a healthier outcome.
September 16, 2020
He reads your medical history and is well informed on the patients medical history
September 14, 2020
Overall process and experience was handled professionally and informative.
September 14, 2020
Nurses were outstanding. Experience was a breeze. Thanks Dr Lah
September 09, 2020
I would recommend Dr. Lah
August 26, 2020
Very good
August 24, 2020
How comfortable the nurses make you feel when their preparation in progress, they have a way of making you comfortable
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