1035 Wellington Avenue , Grand Junction, CO 81501

To Schedule an Office Visit: 970.242.6600

WESTERN COLORADO'S LEADING GASTROENTEROLOGY GROUP

WESTERN COLORADO'S LEADING GASTROENTEROLOGY GROUP

Welcome to Grand Junction Gastroenterology.

At Grand Junction Gastroenterology, we’re a group of physicians specializing in the care of digestive and liver related conditions. Our physicians are board-certified Gastroenterologists.  We do our best to provide advice, testing, and management for outpatient and inpatient adults with symptoms related to the esophagus, stomach, liver, gallbladder, pancreas, small bowel, and colon. We also provide GI related screening and preventative care for adults without symptoms.

Physicians


Physician Assistants

Our Physicians

Brent Prosser
Brent Prosser
MD
Dr. Prosser originally hails from Cheyenne, Wyoming. After receiving his degree in biology from Creighton University in Omaha, NE, he
William Shields
William Shields
DO, FACP, FACG
Dr Shields is a native of Colorado. He attended Western State Colorado University with a degree in biology followed by
George R. Winters III
George R. Winters III
MD, FACP, FACG
Dr. Winters graduated from Cornell University and the University of Vermont, College of Medicine. He completed his Internal Medicine residency
Philip Sarges
Philip Sarges
MD
Dr. Sarges has a passion for caring for people with gastrointestinal system disorders. He’s experienced in capsule endoscopy, fecal transplant,
Ellen Dy
Ellen Dy
MD
Dr. Dy graduated from Indiana University School of Medicine and completed her Internal Medicine Residency at the Indiana University Medical
Dan Castresana
Dan Castresana
MD
Dr. Dan Castresana, M.D., who is relocating with his wife and two daughters from Georgia, is a very skilled gastroenterologist
Michael Harris
Michael Harris
DO
Dr. Michael Harris, D.O. has just completed his training in all aspects of gastroenterology and hepatology care, including ERCP, at

Physician Assistants

Hannah Pick
Hannah Pick
PA-C, MPAS
Hannah is a native of Grand Junction, Colorado. She is excited to be back in the Grand Valley with her
Katie Rabbio
Katie Rabbio
PA-C, MPAS
Katie is a Colorado native and is happy to be practicing in western Colorado. She has extensive experience working as
Leah Barjenbruch
Leah Barjenbruch
PA-C, MPAS
Leah has lived in Grand Junction for two years and has been practicing as a physician assistant for more than
Meagan Taylor
Meagan Taylor
PA-C, MPAS
Meagan is a native of Broomfield, Colorado. She received her Bachelor of Science in Journalism at the University of Colorado,

What Sets Us Apart

Team Of Board-Certified Specialists

Providing Personalized & Innovative Gastroenterological Care

Utilizing The Latest & Most Advanced Techniques

Offering Long-Term Patient Follow-Up & Direct Physician Access