John J. Lah, MD | United Gastroenterologists
John J. Lah, MD | United Gastroenterologists is a Gastroenterologist practice in Los Alamitos, CA. Rated 4.8 from 199 public reviews. Phone and website are listed.
Address
3851 Katella Ave Ste 205, Los Alamitos, CA 90720
Los Alamitos, CA 90720
Phone
(562) 430-4449Website
Visit listed websiteListing updates
Request a correction or opt-outListed hours
- Monday
- 9AM–5PM
- Tuesday
- 9AM–5PM
- Wednesday
- 9AM–5AM
- Thursday
- 9AM–5PM
- Friday
- 9AM–5PM
- Saturday
- Closed
- Sunday
- Closed
Credentials, affiliations, and coverage
Sources
- google-maps-octoparse · checked Aug 30, 2026
- google-maps-octoparse-cloud-recovery · checked Aug 12, 2026
Federal data is attributed to its source and does not imply CMS endorsement.
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Newest reviews
Sue Arnheiter
Office was friendly, efficient and a pleasure. Dr. Lah was also very informative, easy to communicate with, thorough, and helpful.
Toni Teasley
Dr lah is a very good doctor. He explains everything to me before and after my test. I’m so glad I found him.I highly recommend him.
Lisa Ferrer
The front desk was not terribly friendly, but Dr. Lah was friendly yet efficient and the back desk staff was very friendly and helpful.
Michael Mendelsohn
Dr Lah pays attention to what I tell him and tailors my treatment to my specific needs.
Nancy K
Dr Lah is very personable and caring physician
Lakay Page
This was my first visit with Dr. Lah. I was impressed with his willingness to speak frankly and clearly about my upcoming procedures. He has a direct approach which I like. I am looking forward to experience greater appreciation of Dr. Lah's expertise as further treatment unveils. 10 out of 10 so far.
John Robertson
I was in and out of my appointment in about 10 minutes! Dr. Lah and staff are the best.
Joel Ellis
Just follow up talk to Dr
Alexander Harris
No written review was provided.
Angie
The staff was efficient and nice. I loved the Doctor he informed very well. Thank you
