Please join us in welcoming our newest provider – Dr. John Gancayco! Dr. Gancayco will be practicing at our Connally Oaks location.
Dr. Gancayco joins us after a distinguished 24-year career in the U.S. Air Force, where he earned the rank of Colonel. He holds a degree in Writing and Literature from Georgetown University and received his medical degree from the Uniformed Services University of the Health Sciences. Dr. Gancayco completed his internal medicine residency at Wilford Hall Medical Center and his gastroenterology fellowship at Yale New Haven Hospital.
Throughout his military career, Dr. Gancayco has had the privilege of practicing medicine worldwide. He served as Chief of Gastroenterology at Okinawa Naval Hospital, providing care for U.S. service members and their families, and treated soldiers returning from Afghanistan at Landstuhl Medical Center in Germany. He also deployed to Afghanistan in support of Operation Enduring Freedom.
A passionate educator, Dr. Gancayco served as Program Director for the gastroenterology fellowship at Brooke Army Medical Center, where he trained over 45 fellows with a perfect 10-year board first-pass rate. He has mentored hundreds of medical students and holds the rank of Associate Professor. His research and clinical expertise are demonstrated through his role as primary investigator for more than 15 Phase III clinical trials, as well as his numerous publications and contributions to medical literature, including a book chapter.
Dr. Gancayco’s leadership extends beyond clinical practice. He served as the Specialty Leader for the Air Force Surgeon General and as the American College of Gastroenterology’s Military Governor.
He specializes in all aspects of digestive health, including colon cancer screening, irritable bowel syndrome, liver disease, Crohn’s disease, and ulcerative colitis. Above all, he values the patient relationship and is committed to providing the latest advancements in gastroenterology to improve his patients’ well-being.
Dr. Gancayco and his wife Ela have called San Antonio home for the last decade, where they enjoy supporting their children in both the arts and sports. Outside of work, he enjoys barbecuing, fly fishing, running, reading, and traveling with his family.
Dr. Gancayco is scheduling new patients now – schedule an appointment today!
If you have not registered with the new gPortal yet please select the Register/Learn More button for instructions on registering.
Please note that your current /old patient portal credentials will become inactive after August 31, 2022, so update your account today to avoid any disruption in accessibility.
To pay your bill online, please choose the correct option below: select the “Clinic Locations” button if you’re paying your Physician or Clinic Statement, or select the “ASC Locations” button if you’re paying your Procedure Statement at one of our Ambulatory Surgical Centers.
Gastroenterology Consultants of San Antonio (GCSA) is a Professional Association owned by the physicians that practice within it. GCSA’s physicians are directly involved in the management of patient services. GCSA physicians have indirect ownership interest in our Histology/Pathology, Anesthesia, Infusion and Ambulatory Surgical Centers (ASC).
