Lisa Hertz, M.D., earned her Doctor of Medicine from Harvard Medical School and then completed her internship and residency in Internal Medicine and fellowship in Gastroenterology at UCLA. Dr. Hertz is board certified in both Internal Medicine and Gastroenterology.
Lisa Hertz, M.D., earned her Doctor of Medicine from Harvard Medical School and then completed her internship and residency in Internal Medicine and fellowship in Gastroenterology at UCLA. Dr. Hertz is board certified in both Internal Medicine and Gastroenterology.
The reviews listed below were collected independently of Unio Specialty Care through rater8. Each review represents an authentic and verified patient experience.
Dr Hertz is an excellent doctor. I've been under her care for many yrs.
I drive 90 miles to see her because I trust her opion and her care.
(1 week ago)
Apr-2026
Dr. Hertz is very professional and detailed in her care. She is extremely thorough, and asks good questions. She takes the time to discuss other medical conditions that I may have prior to determining any course of action, procedures, or medication changes necessary.
Very present and easy to talk to.
Thank you, Dr Hertz!
(1 week ago)
Apr-2026
Love Dr Hertz!!! Best GI Dr
(2 weeks ago)
Mar-2026
She’s the best—so well respected by EVERYONE—fellow doctors and patients alike. I’m very grateful to be her patient!
(2 weeks ago)
Mar-2026
She is a great gastroenterologist, thorough with a great bedsides manner
(2 weeks ago)
Mar-2026
Excellent listener and diagnostician.
(3 weeks ago)
Mar-2026
Dr. Hertz is wonderful and caring, she is an amazing doctor.
(3 weeks ago)
Mar-2026
Excellent Doctor. Takes the time to explain diagnosis.
(3 weeks ago)
Mar-2026
Thorough, professional, clear explanation of what's going on. Very lucky to have her in my life.
(1 month ago)
Mar-2026
I’ve been a patient of Dr. Hertz for a very long time She has always helped diagnose and give me good advice on my medical needs . She has always been able to help!
(1 month ago)
Feb-2026
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GI-Los Alamitos
4772 Katella Ave Suite 200 Los Alamitos, CA 90720
Lisa Hertz, M.D., earned her Doctor of Medicine from Harvard Medical School and then completed her internship and residency in Internal Medicine and fellowship in Gastroenterology at UCLA. Dr. Hertz is board certified in both Internal Medicine and Gastroenterology. She has been in private practice in the Long Beach/Los Alamitos area since 1989 and has extensive experience in treating a wide range of gastrointestinal illnesses with a focus on promoting thorough and complete healing through personal, intuitive and research-based care. Special areas of interest include inflammatory bowel disease (Ulcerative Colitis and Crohn’s disease) as well as colon cancer screening.
Dr. Hertz is currently a member of the Southern California Society of Gastroenterology, the Crohn’s and Colitis Foundation and the Long Beach branch of the American Medical Women’s Association. She has served as Chair of Gastroenterology at St. Mary’s Medical Center and currently sits on the medical executive committee at the Memorial Outpatient Surgery Center of Long Beach.
In addition to practicing medicine, she is a devoted mother to her two daughters Ali and Chloe, as well as her four legged children Ruby, Peanut and Betsy. She enjoys working in her garden at home and being an advocate for environmental and animal rights issues.
Dr Hertz is an excellent doctor. I've been under her care for many yrs. I drive 90 miles to see her because I trust her opion and her care.
Dr. Hertz is very professional and detailed in her care. She is extremely thorough, and asks good questions. She takes the time to discuss other medical conditions that I may have prior to determining any course of action, procedures, or medication changes necessary. Very present and easy to talk to. Thank you, Dr Hertz!
Love Dr Hertz!!! Best GI Dr
She’s the best—so well respected by EVERYONE—fellow doctors and patients alike. I’m very grateful to be her patient!
She is a great gastroenterologist, thorough with a great bedsides manner
Excellent listener and diagnostician.
Dr. Hertz is wonderful and caring, she is an amazing doctor.
Excellent Doctor. Takes the time to explain diagnosis.
Thorough, professional, clear explanation of what's going on. Very lucky to have her in my life.
I’ve been a patient of Dr. Hertz for a very long time She has always helped diagnose and give me good advice on my medical needs . She has always been able to help!