Welcome to Our Practice

We are now on the west side of Denver at the
Red Rocks Medical Center!

Gastroenterologist Denver, Aurora, and Golden, CO - Colorado Gastroenterology

Colorado Gastroenterology welcomes you!

Colorado Gastroenterology is one of the region’s most trusted resources for the diagnosis, prevention, and treatment of all gastrointestinal and liver diseases delivered with professional, prompt, and compassionate care.

Trusted Consultation:

One of our experienced gastroenterologists will take the time to understand your unique problem and help you develop a thoughtful, cutting-edge plan to get back to health. Our physicians are board certified with advanced training and expertise in all areas of digestive and liver diseases.  Referring doctors trust us with their most difficult problems, but also respect our commitment to cost-effective care.

Compassionate Care:

At Colorado Gastroenterology, we treat the whole person, not just a disease. We believe every patient is unique and special. Our physicians will listen to you and understand your problem, then empower you with a comprehensive plan to wellness.  We want you to make well informed decisions regarding your health, and will communicate with you until you feel prepared.

Comfortable and Convenient:

Great care means nothing if you can’t access it—getting care at Colorado Gastroenterology is easy. We strive to make our office not only efficient, accurate, and available, but also in a comfortable and caring environment. With offices across the Denver metro area, you are sure to find a convenient and accessible location where we can see you soon.

We hope that you find this website useful and invite you to contact us with your questions at any time. We look forward to working with you.

Meet the Doctors


Jennifer W. Brenner, M.D.


Jeffrey W. Frank, M.D.


Kevin M. Rufner, M.D., M.P.H.


Kevin S. Sieja, M.D.


Thomas E. Trouillot, M.D.

Learn more about the doctors here.