The Gastroenterology Clinic provides collaborative, patient-centered care to treat a variety of gastrointestinal and liver diseases, offering evaluation and treatment for symptoms involving the liver, gallbladder, esophagus, stomach, small intestine and colon.

St. Peter’s Approach to Gastroenterology

Our care team of nurses, nurse practitioners, and physicians is committed to providing excellent patient education in accordance with American Society for Gastrointestinal Endoscopy standards, so to help you understand how we can help evaluate and manage your condition.

Along with caring for patients in our clinic and in the hospital, our Gastroenterology care team provides outpatient procedures such as gastrointestinal endoscopies to check for cancer of the esophagus and colonoscopies to screen for colon cancer.

Conditions Treated

The Gastroenterology care team at St. Peter’s Health provides a wide range of in-clinic services for the treatment of:

  • Crohn’s disease
  • IBD (irritable bowel syndrome)
  • Diverticulitis
  • Diverticulosis
  • Chronic constipation
  • Chronic diarrhea
  • Cirrhosis
  • Hepatitis C
  • Colon cancer
  • Polyps
  • Barrett’s Esophagus
  • Gastrointestinal tract cancer screening

Care Team

Michael Lee, MD

Gastroenterologist Michael Lee, MD is a Board Certified Gastroenterologist who earned his Doctor of Medicine at the State University of New York in Syracuse.  He completed his residency and internship in internal medicine at Upstate Medical Center in Syracuse, and his fellowship in gastroenterology at the University of California-Davis Medical Center.

Mary Middagh, FNP

Mary Middagh, FNP is a Montana native delighted to be serving the community of Helena. She earned her Master of Science in Nursing and Human Physiology as a Family Nurse Practitioner from Gonzaga University in Spokane, Washington. She earned her Bachelor of Science in Nursing from Montana State University in Bozeman and her Bachelor of Arts in Spanish Language and Latin American Studies from the University of Montana in Missoula.

Colleen Shattuck, PA-C

Colleen M. Shattuck, PA-C completed the Physician Assistant Program at Red Rocks Community College in Lakewood, Colo., and earned her master’s degree at St. Francis University in Loretto, Penn. Colleen is board certified by the American Academy of Physician Assistants and a member of the National Commission on Certification of Physician Assistants.

Location(s) of Gastroenterology Services