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About St. Joseph Health

SJH provides a full range of care facilities including 16 acute care hospitals, home health agencies, hospice care, outpatient services, skilled nursing facilities, community clinics and physician groups. All of our hospital and home health entities are accredited by the Joint Commission. In our award-winning facilities, SJH maintains a "continuum of care," matched to the diverse needs of the urban centers, smaller cities and rural communities who depend on us every day.

Elmer Y. Chang, MD

4.9 out of 5 (74 Ratings)
Specialty
  • Gastroenterology
    (Board Certified)
Additional Language Spoken
Hokkien, Chinese - Mandarin, English
Medical Groups & Affiliations
  • Mission Heritage Medical Group
  • Mission Hospital Affiliated Physicians
Address
Mission Heritage Mission Viejo - Gastroenterology Suite 200
27871 Medical Center Road
Suite 200
Mission Viejo, CA 92691
Accepting New Patients

Primary Office

Address
Mission Heritage Mission Viejo - Gastroenterology Suite 200
27871 Medical Center Road
Suite 200
Mission Viejo, CA 92691
Get Directions
Phone
(949) 364-5090
Fax
(949) 364-5427

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Gastroenterology
      (Board Certified)
    Education & Training
    • Medical School
      Northwestern University School of Medicine
    • Internship
      Baylor College of Medicine
    • Residency
      Baylor College of Medicine
    • Fellowship
      UCSF Medical Center at Parnassus - 2008
    • Fellowship
      UCLA Medical Center - 2007
  • Biography

    Biography

    Biography

    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.

    Certifications
    American Gastroenterology Association American Society of Gastrointestinal Endoscopy American College of Gastroenterology American Medical Association
    Areas of Expertise
    Colon cancer screening Heartburn or acid reflux Peptic ulcer disease Inflammatory bowel disease
  • 8-Oct-2019
    excellent care from dr vy nguyen and dr elmer chang
    7-Oct-2019
    Great care from ALL Mission Heritage doctors!
    2-Oct-2019
    Kind & thorough & knowledgeable.
    23-Jul-2019
    Very accessible, great Doctor ~ Patient interaction, very knowledgeable and professional. I have total confidence with his health recommendations.
    22-Jul-2019
    As a senior I have problem remember everything the doctor said in the office, therefore a written summary of this office visit would have been very helpful. I had to call the doctor's office after my visit to clarify how I should take three different medications in one day in fear of interaction between them. I also had to ask for a complete list of food restrictions because it wasn't given to me in the office. I believe both the doctor and the patient are partners in improving patient's condition. Only with good communication between them could bring success. I can't understand why text or email are not allowed in this group, they are the best way to convey complicated matters.
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