Gastroenterologist talking to patient Gastroenterology blue

Kevin S. Sieja, M.D.


Ages Treated: 18+

(303) 214-9316

Quick Facts:

  • Virtual Telemedicine Available
  • Board Certified Gastroenterologist
  • Performs Colonoscopies
  • Currently Accepting New Patients
  • Most Insurance Plans Accepted

Kevin S. Sieja, M.D. Practices at the Following Locations

Denver – N Ogden St, CO 1960 N Ogden Street, Suite 220, Denver, CO 80218 (303) 214-9316 Request an appointment at this location
Denver – E 1st Ave, CO 8155 E 1st Ave, Denver, CO 80230 (720) 316-7205 Request an appointment at this location
Aurora, CO 13701 East Mississippi Ave, Suite 380, Aurora, CO 80012 (303) 214-9327 Request an appointment at this location
"$000 - $000",

About Kevin S. Sieja, M.D.

Dr. Kevin Sieja is a board-certified Gastroenterologist with Colorado Gastroenterology. He performs routine GI procedures such as upper endoscopy and colonoscopy in the diagnosis, screening and surveillance of gastrointestinal diseases and cancers. He has served as managing partner for his practice for over 10 years. He is a member of the American Gastroenterological Association and American Society of Gastrointestinal Endoscopy.


Undergraduate: University of Notre Dame

Medical School: Northwestern University

Residency & Fellowship: University of Colorado Health Sciences Center

Why did you choose to specialize in Gastroenterology?

Gastroenterology is one of the most interesting fields in medicine as it combines technologically advanced procedures with the thoughtful practice of medicine. It is an intellectually and emotionally rewarding profession. I manage conditions across the multiple organs that make up the gastrointestinal tract. I am often able via procedures to directly visualize and diagnose conditions firsthand and then prescribe appropriate medical treatment based on those findings or in some cases to address the problem during the procedure. The specialty also allows me to develop long term relationships with many patients such as those with inflammatory bowel disease and irritable bowel syndrome. Finally, with a focus on colon cancer screening and prevention through colonoscopy, I can help reduce the incidence of the second leading cause of cancer death on a daily basis.

Do you have a specialty of interest in Gastroenterology?

I treat all conditions and diseases of the gastrointestinal tract and liver.

What do you and your family enjoy doing in your spare time?

We enjoy spending time at home with our family and two dogs. And we value our time together in the outdoors on the mountains, valleys, and waters of beautiful Colorado

Awards and Accreditation:

I graduated summa cum laude from the University of Notre Dame and while in medical school at Northwestern, I became a member of the prestigious Alpha Omega Alpha Honor Medical Society. I have served as Managing Partner of the practice for over 10 years.


Board Certified in Gastroenterology

Professional Affiliations

American Gastroenterological Association

American Society for Gastrointestinal Endoscopy