Aaron P. Fieker, DO

Dr. Aaron Fieker joined Gastroenterology Specialists, Inc. in 2025. He is board certified in gastroenterology and is a member of the American Society for Gastrointestinal Endoscopy, the American College of Gastroenterology, the American Gastroenterology Association, the American Osteopathic Association, and the American Medical Association.

Prior to joining GSI, Dr. Fieker was a gastroenterologist at Ascension St. John and Saint Francis Health System.

Board Certification:
American Board of Internal Medicine, Gastroenterology — 2012
American Board of Internal Medicine, Internal Medicine — 2008

Education:
Oklahoma State College of Osteopathic Medicine – Medical School — 2005
Baylor University, Waco, TX – BS — 2000

Professional Training:
University of Oklahoma College of Medicine – Gastroenterology Chief Fellow — 2012
University of Oklahoma College of Medicine – Fellowship — 2012
University of Tennessee Health Science Center College of Medicine – Internship & Residency — 2008