John M. Castor, MD

Dr. John Castor was born and raised in Columbus, Ohio and received his undergraduate degree from Otterbein College. He joined Ohio Gastroenterology Group, Inc. in 2011 after completing his residency and fellowship training at Duke University. He is board certified in Gastroenterology and has earned a Masters of Health Science (MHS) degree. He serves as a Clinical Faculty Member for the Ohio State University and Ohio University Heritage College of Osteopathic Medicine. In addition to general gastroenterology, Dr. Castor has a special interest in esophageal disorders including dysmotility and GERD.

Primary Practice Location:

3400 Olentangy River Road
Columbus, OH 43202


450 Alkyre Run Drive, Suite 350
Westerville, OH 43082


Esophagogastroduodenoscopy (EGD)
EGD with Band Ligation
EGD with Bravo pH Monitoring
Fecal Microbiota Transplant (FMT)
Flexible Sigmoidoscopy
Interpretation of BRAVO
Interpretation of High Resolution Esophageal Function Test (EFT)
Interpretation of 24 hour pH-Impedance Studies

Hospital Appointments:

Riverside Methodist Hospital, Columbus, Ohio
Dublin Methodist Hospital, Dublin, Ohio
Mount Carmel Hospital East, Columbus, Ohio
Mount Carmel Hospital West, Columbus, Ohio

Board Certification:

American Board of Internal Medicine, Gastroenterology, 2011
American Board of Internal Medicine, 2008


Duke University, Durham, NC – Master of Health Science (MHS), 2010
Case Western Reserve School of Medicine, Cleveland, OH – MD, 2005
Otterbein College, Westerville, OH – BA (Life Science), Magna cum Laude, 2000
Otterbein College, Westerville, OH – BA (Business Admin), 1997

Professional Training:

Duke University Medical Center, Durham, NC – Gastroenterology Fellowship, 2008-2011
University of North Carolina, Chapel Hill, NC – Visiting Motility Fellow, February 2010
Duke University Medical Center, Durham, NC – Residency, Internal Medicine, 2005-2008