Dr. Mark Earle Powis, MD

Dr. Mark Powis specializes in gastroenterology and dermatology, bringing more than three decades of medical expertise to patient care. He earned his medical degree from the University of Illinois at Chicago College of Medicine and completed his residency training through the U.S. Department of Veterans Affairs. With 33 years of experience treating complex digestive and skin conditions, Dr. Powis has developed comprehensive skills in managing a wide range of patient needs across both specialties.

Dr. Powis practices at multiple locations throughout Lone Tree and Littleton, Colorado, with affiliations at Adventhealth Littleton and HCA HealthOne Sky Ridge. His gastroenterology expertise includes treating hemorrhoids, colon polyps, and GERD, helping patients find relief from digestive concerns. He performs specialized procedures such as kidney transplant biopsies and provides sedation services for patient comfort during medical procedures. Dr. Powis also conducts pathology tests to ensure …accurate diagnoses and effective treatment planning.