Dr. Hallett received his graduate degree from the University of Illinois in 1987, and has
completed his internal medicine residency at Barnes Hospital, Washington University
and fellowship in gastroenterology at Barnes Hospital, Washington University. He has
been with Digestive Care Center since December 2019.
He is certified by the American Board of Internal Medicine and the American Board of
Internal Medicine – Gastroenterology. In addition to providing consultative
gastroenterology care, he specializes in upper endoscopy, colonoscopy, therapeutic
endoscopy (ERCP), and motility disorders of the esophagus and colon.
Dr. Hallett is a member of American Gastroenterological Association (AGA), and the
American Society for Gastrointestinal Endoscopy (ASGE). He is the Friends of Tenwek
Gastroenterology/Endoscopy Champion, and he leads the Surgical Endoscopy Task
Force for the Pan-African Association of Christian Surgeons.
Dr. Potteiger received his graduate degree from Philadelphia College of Osteopathic
Medicine in 1998, and has completed his internal medicine residency at Geisinger
Medical Center. He was Chief Medical Resident for internal medicine at Geisinger
Medical Center. Dr. Potteiger has completed his fellowship in gastroenterology and
nutrition at Geisinger Medical Center. He has been with Digestive Care Center since
He is certified by the American Board of Internal Medicine – Gastroenterology. In
addition to providing consultative gastroenterology care, he specializes in colonoscopy,
upper endoscopy and nutrition/weight management.
Dr. Potteiger is involved in many professional societies include: American College of
Gastroenterology, American College of Physicians and American Society for
Katie Luigs is a Board Certified Acute Care Nurse Practitioner at Digestive Care Center. She is responsible for diagnosing and treating a wide variety of digestive diseases by using lab tests, imaging and procedures to identify the source of the problem. Then she works with the patient to determine the best treatment plan. Whether a patient has a life-threatening illness or a problem that can easily be treated, Katie’s end goal is always the same – do whatever she can to help her patients feel better.
Katie grew up in Washington, and now lives in Evansville. In her spare time, she enjoys reading, traveling and trying out new restaurants.