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Evan Mosier,

M.D.

Gastroenterologist; Assistant Clinical Professor, Department of Medicine

4.9 (77 Ratings)
Biography photo
Location
City of Hope Comprehensive Cancer Center - Duarte
1500 East Duarte Road
Duarte, CA 91010
Specialties
Gastroenterology
Education
Medical school:

University of Hawaii John A. Burns School of Medicine, Honolulu, HI

Residency:

2015–2018, Internal Medicine, LAC+USC Medical Center, Los Angeles, CA

Fellowship:

2018–2021, Gastroenterology, Loma Linda University, San Bernardino, CA

Academic Appointments
  • Assistant Clinical Professor, Department of Medicine
About Me

Evan Mosier, M.D., is a gastroenterologist and assistant professor in the Department of Medicine at City of Hope® Cancer Center Duarte. He is dedicated to preventing and detecting gastrointestinal cancers as early as possible and takes a compassionate, person-centered approach to care. Dr. Mosier believes patients should be active partners in their treatment and have the support they need to live a healthy, fulfilling life. 

Dr. Mosier earned his medical degree from the University of Hawaii John A. Burns School of Medicine, followed by an internal medicine residency at LAC+USC Medical Center (now Los Angeles General Medical Center) and a gastroenterology fellowship at Loma Linda University. During fellowship, he received advanced training in diagnosing and treating swallowing and digestive motility disorders. He also has expertise in manometry, pH testing and EndoFlip/EsoFlip, and is an active member of the American Neurogastroenterology and Motility Society (ANMS). 

A physician and researcher, Dr. Mosier has published in several peer-reviewed journals and was recognized as “Fellow of the Year” during his training at Loma Linda University.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, City of Hope.
Mar 25, 2026
"Very polite, and very concerned"
Mar 25, 2026
"Good"
Mar 25, 2026
"Great Dr.."
Feb 23, 2026
5.0
"Doc was specular. First one that explained the good, bad, and the ugly. Then good"
Feb 14, 2026
5.0
"The provider is extremely knowledgeable and puts one at ease. Definitely an elite experience with the provider compared to others"
Feb 14, 2026
5.0
"My wife had great experience with COH and they cured her. COH is on top of their game and therefore I have gone to them for my health check up. I'm always recommending to anyone I meet here in valley to go to COH, they are caring and compassionate."
Jan 24, 2026
4.7
"Good"
Jan 9, 2026
5.0
"Dr. Mosier was very personable and a good listener."
Jan 7, 2026
5.0
"Excellent"
Jan 7, 2026
5.0
"Excellent"
Jan 7, 2026
5.0
"Excellent"
Dec 20, 2025
5.0
"Dr. Mosier was very attentive and showed that he really cared about his patients needs and concerns. He was kind and calm and answered every questions my daughter and myself had."
Dec 6, 2025
5.0
"Excellent! Collaborative, listened to me, answered all questions to my satisfaction. Pleasant, affable, very professional, competent."
Nov 5, 2025
5.0
"Discussed the procedure and different methods and changes since my last colonoscopy"
Oct 15, 2025
5.0
"Excellent"
Oct 15, 2025
5.0
"I always recommend City of Hope to everyone I meet due to the excellent care that I receive."
Oct 15, 2025
5.0
"[...] he made me feel heard and relaxed my mind, it's hard being sick and not know why, but he assured me he would help in all ways possible."
Oct 15, 2025
5.0
"Excellent"
Oct 15, 2025
5.0
"Excellent"
Oct 15, 2025
5.0
"Excellent"
Sep 30, 2025
5.0
"Dr.Mosier was very knowledgeable about my situation and called me back when he received all my information from my previous procedure."
Sep 20, 2025
5.0
"It's a very good well explained"
Sep 20, 2025
5.0
"Yes I would recommend all Drs at COH to everone"
Sep 18, 2025
5.0
"Very knowledgable and responsive to all my questions. Excellent doctor."
Sep 13, 2025
5.0
"He was kind, professional, knowledgeable and polite."
Sep 3, 2025
5.0
"The care provider was very nice. [...]"
Sep 2, 2025
5.0
"Really nice and thorough explained all questions"
Aug 6, 2025
5.0
"Very professional and very friendly, explains every thing in very clear way for me to understand."
Aug 3, 2025
5.0
"Dr. Mosier is an excellent communicator. He educates and explains in a calm manner. He is responsive to questions."
Jul 14, 2025
5.0
"Dr Mosier is the best! He really listens and gives great advice."
Jun 27, 2025
5.0
"Dr Mosier is a very concerned doctor"
Jun 26, 2025
4.7
"I've been coming to COH since 1994. I have had excellent care and doctors"
Jun 25, 2025
4.7
"Dr Mosier is very professional, compassionate, and knowledgeable."