You are using an outdated browser. For the best experience, please upgrade to a newer browser.
4.9 86 Ratings | 46 Comments

Elmer Y. Chang, MD

Accepting New Patients
Check if your insurance is accepted
Doesn't Accept
Offers Video Visits
4.9 | 86 Ratings | 46 Comments
Mission Heritage Mission Viejo - Gastroenterology
27799 Medical Center Road, Suite 310
Mission Viejo, CA 92691
Medical Groups & Affiliations
Mission Heritage Medical Group
Speaks: Hokkien, Chinese - Mandarin, and English

Are you covered?

Check to see if your insurance is accepted by this provider.
Please contact your insurance provider to confirm if your health plan is accepted.

About Elmer Y. Chang

Dr. Chang is a Board Certified Gastroenterologist who specializes in the evaluation and management of disorders of the gastrointestinal tract, pancreas, bile duct, and liver.

He performs upper endoscopy and colonoscopy to screen for, diagnose, and treat a variety of gastrointestinal diseases and cancers.

He also has expertise in several advanced endoscopic techniques including endoscopic retrograde cholangiopancreatography (ERCP), a procedure that is used to manage stones, strictures, and malignant obstruction of the bile duct. He is fluent in English, Mandarin, and Taiwanese.

Dr. Chang graduated with degrees in molecular biology and economics from the Northwestern University, and received his medical degree from the Northwestern University Medical School. After finishing residency training in Internal Medicine from the Baylor College of Medicine, he completed a fellowship in gastroenterology and hepatology at the UCLA School of Medicine.

During his fellowship, Dr. Chang was recruited into the Specialty Training and Advanced Research program at UCLA, where he conducted research in gut immunity and inflammatory bowel disease. In recognition of this research, he was granted a philosophical doctorate degree from the Department of Microbiology, Immunology, and Molecular Genetics at UCLA.

He also received several awards for this work, including grants from the National Institute of Health and the Crohn's and Colitis Foundation of America.

Following his fellowship training at UCLA, Dr. Chang pursued another year of advanced endoscopic fellowship at the UCSF School of Medicine, where he developed expertise in therapeutic ERCP, endoscopic ultrasound, gastrointestinal stricture remediation, and other advanced endoscopic procedures.

Dr. Chang has published numerous abstracts and articles in the field of gut immunity, inflammatory bowel disease, and pancreaticobiliary disorders in peer-reviewed journals such as Gastroenterology, Journal of Clinical Investigation, and Journal of Immunology.

He is a member of the American Gastroenterology Association, American Society of Gastrointestinal Endoscopy, American College of Gastroenterology, and American Medical Association.

Medical School

Northwestern University School of Medicine


Baylor College of Medicine


Baylor College of Medicine


UCSF Medical Center at Parnassus


UCLA Medical Center

Board Certifications

  • American Board of Internal Medicine, Gastroenterology
Mission Heritage Mission Viejo - Gastroenterology
27799 Medical Center Road, Suite 310
Mission Viejo, CA 92691
Medical Groups & Affiliations
Mission Heritage Medical Group
Affiliated Locations

Mission Hospital, Laguna Beach
Providence Mission Hospital Mission Viejo