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 professional, engaging, caring and always explains procedures. I have been seeing her for 30 years. She has done all of my colonoscopies. I admire her personally and professionally!
(3 days ago)
Apr-2026
Dr. Hertz, is very professional and is dedicated in provides such outstanding care for me as a patient. She is patient and takes her time when I have either office visits or tele visits. Dr. Hertz is very honest and straightforward in treating and diagnosing me as her patient. She always makes her patients care her number 1 priority.
(1 week ago)
Apr-2026
Always very knowledgeable & professional. Makes you feel like you are her only patient.
(1 week ago)
Apr-2026
Very knowledgeable and competent
(2 weeks ago)
Apr-2026
Love her! So knowledgeable, so thorough, and so attentive! Thank you
(2 weeks ago)
Apr-2026
Very thorough, approachable, prompt and professional. Friendly staff. A fantastic doctor who cares about her patients.
(3 weeks ago)
Apr-2026
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 month 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 month ago)
Apr-2026
Love Dr Hertz!!! Best GI Dr
(1 month 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!
(1 month ago)
Mar-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 professional, engaging, caring and always explains procedures. I have been seeing her for 30 years. She has done all of my colonoscopies. I admire her personally and professionally!
Dr. Hertz, is very professional and is dedicated in provides such outstanding care for me as a patient. She is patient and takes her time when I have either office visits or tele visits. Dr. Hertz is very honest and straightforward in treating and diagnosing me as her patient. She always makes her patients care her number 1 priority.
Always very knowledgeable & professional. Makes you feel like you are her only patient.
Very knowledgeable and competent
Love her! So knowledgeable, so thorough, and so attentive! Thank you
Very thorough, approachable, prompt and professional. Friendly staff. A fantastic doctor who cares about her patients.
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!