Mount Sinai DoctorsTreats Adults
Accepting New Patients
Ji Yoon Yoon, MBBCh
Gastroenterology
About Me
Dr. Ji Yoon Yoon joined Mount Sinai Doctors as a Gastroenterologist in 2025. She earned her undergraduate degree (BA, Medical Sciences) and medical degree (BM BCh) at the University of Oxford (United Kingdom) and moved to the US to complete an Internal Medicine residency at the Cleveland Clinic Foundation. Dr. Yoon then completed her Gastroenterology training at the Icahn School of Medicine at Mount Sinai, where she also served as Chief Fellow. Dr. Yoon additionally completed a Master’s in Clinical Research (MSCR) and a Research Fellowship in Cancer Prevention and Control in Priority Populations (NIH T32) at the Icahn School of Medicine at Mount Sinai. Dr. Yoon is board certified by the American Board of Internal Medicine in both Internal Medicine and Gastroenterology.
Dr. Yoon specializes in a wide range of gastrointestinal conditions, both acute and chronic. Her research interests focus on gastrointestinal cancers, including gastric cancer, esophageal cancer, pre-cancerous lesions, and H. pylori. Her research is supported by the American Cancer Society Clinician Scientist Development Grant.
In her professional community, Dr. Yoon is a member of the American Gastroenterological Association and the American College of Gastroenterology. She is Assistant Professor of Medicine in the Dr. Henry D. Janowitz Division of Gastroenterology at the Icahn School of Medicine at Mount Sinai.
Dr. Yoon is originally from Seoul, South Korea, and is a native Korean speaker.
Language
Position
Hospital Affiliations
- Mount Sinai Morningside
- Mount Sinai Beth Israel
- Mount Sinai Brooklyn
- Mount Sinai Queens
- The Mount Sinai Hospital
- Mount Sinai West
About Me
Dr. Ji Yoon Yoon joined Mount Sinai Doctors as a Gastroenterologist in 2025. She earned her undergraduate degree (BA, Medical Sciences) and medical degree (BM BCh) at the University of Oxford (United Kingdom) and moved to the US to complete an Internal Medicine residency at the Cleveland Clinic Foundation. Dr. Yoon then completed her Gastroenterology training at the Icahn School of Medicine at Mount Sinai, where she also served as Chief Fellow. Dr. Yoon additionally completed a Master’s in Clinical Research (MSCR) and a Research Fellowship in Cancer Prevention and Control in Priority Populations (NIH T32) at the Icahn School of Medicine at Mount Sinai. Dr. Yoon is board certified by the American Board of Internal Medicine in both Internal Medicine and Gastroenterology.
Dr. Yoon specializes in a wide range of gastrointestinal conditions, both acute and chronic. Her research interests focus on gastrointestinal cancers, including gastric cancer, esophageal cancer, pre-cancerous lesions, and H. pylori. Her research is supported by the American Cancer Society Clinician Scientist Development Grant.
In her professional community, Dr. Yoon is a member of the American Gastroenterological Association and the American College of Gastroenterology. She is Assistant Professor of Medicine in the Dr. Henry D. Janowitz Division of Gastroenterology at the Icahn School of Medicine at Mount Sinai.
Dr. Yoon is originally from Seoul, South Korea, and is a native Korean speaker.
Language
Position
Hospital Affiliations
- Mount Sinai Morningside
- Mount Sinai Beth Israel
- Mount Sinai Brooklyn
- Mount Sinai Queens
- The Mount Sinai Hospital
- Mount Sinai West
Clinical Focus
- Abnormal Liver Enzymes
- Acid Reflux / Heartburn
- Barrett's Esophagus
- Bile Duct Diseases
- Black Stool / Melena
- Blood in Stool
- Celiac Disease
- Chronic Pancreatitis
- Clostridium Difficile Colitis
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Education
MBBCH, University of Oxford
Internship, Internal Medicine
Guys and St. Thomas Hospital NHS Trust
Residency, Internal Medicine
Cleveland Clinic
Fellowship, Gastroenterology
Icahn School of Medicine At Mount Sinai
Certifications
American Board of Internal Medicine
Locations
Insurance Information
Accepted insurance may vary by the doctor’s office location. Please contact the office directly to obtain the most up-to-date insurance information.
Patients with Cigna Medicare Advantage or Humana Medicare Advantage insurance: Please read this important message before booking to find out if out-of-network costs may apply to your next visit.
- Mount Sinai Doctors - Crescent Street30-14 Crescent Street, 3rd Floor, Astoria, NY, 11102
Physicians who provide services at hospitals and facilities in the Mount Sinai Health System might not participate in the same health plans as those Mount Sinai hospitals and facilities (even if the physicians are employed or contracted by those hospitals or facilities).
Information regarding insurance participation and billing by this physician may be found on this page, and can also be obtained by contacting this provider directly. Because physicians insurance participation can change, the insurance information on this page may not always be up-to-date. Please contact this physician directly to obtain the most up-to-date insurance information.
Insurance and health plan networks that the various Mount Sinai Health System hospitals and facilities participate in can be found on the Mount Sinai Health System website.
Industry Relationships
Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device, biotechnology companies, and other outside entities to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their outside financial relationships.
Dr. Yoon has not yet completed reporting of Industry relationships.
Mount Sinai's faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.
Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device, biotechnology companies, and other outside entities to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their outside financial relationships.
Dr. Yoon has not yet completed reporting of Industry relationships.
Mount Sinai's faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.