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Cass R. Smith, MD


Doctor of Medicine

St. Luke's Health Partner
St. Luke's Health Partner

These providers work together to achieve patient-centered care, using proven best practices to offer better care to you and your family.


Accepting new patients
By Referral Only

Facilities & Clinics

    • Address
      305 E. Jefferson St. Boise, ID 83712
      Mon - Thu: 8 a.m. - 4:30 p.m.
      Fri: 8 a.m. - 3 p.m.
    • Phone
      (208) 381-7122
      (208) 381-7002

  1. St. Luke's Children's Gastroenterology

    • Address
      3430 Washington Pkwy Idaho Falls, ID 83404
    • Phone
      (208) 381-7310
      (208) 381-7311

About Cass R. Smith


Cass R. Smith, MD is a pediatric gastroenterologist who sees a wide variety of pediatric patients. His areas of special interest include inflammatory bowel disease, diseases of the pancreas and liver, eosinophilic esophagitis, neurogenic bowel due to spina bifida, functional abdominal pain and constipation. He performs upper and lower endoscopy, including removal of polyps and control of bleeding, liver biopsies, removal of foreign bodies and care and maintenance of gastrostomy tubes. Dr. Smith asks for and respects input and decisions from children and their parents, supporting them in maintaining an active role in medical care.

At St. Luke's, Dr. Smith has helped lead numerous quality improvement initiatives, working to standardize pediatric gastrointestinal (GI) care. He is also committed to advancing the quality of care throughout Idaho. He travels to Idaho Falls regularly to offer clinic visits and endoscopy to patients in eastern Idaho.   

Dr. Smith completed his bachelor's degree in zoology at Brigham Young University. During medical school at the University of Nevada, Reno, he achieved special qualifications in nutrition and conducted research in natural killer and lymphokine-activated killer cell activity and antioxidants. He completed his residency in pediatrics at the combined University of Nebraska/Creighton University program and his fellowship in pediatric gastroenterology at Children’s Hospital of Wisconsin.  

In his free time, Dr. Smith enjoys spending time with his wife and children, golfing, camping, hiking and fishing. He also enjoys woodworking and regularly submits pieces for auction at the annual St. Luke's Children’s Hospital fundraiser Kid for a Night.
  • Medical School

    University of Nevada School of Medicine
  • Residency

    Creighton - Nebraska University
  • Fellowship

    Medical College of Wisconsin
  • Board Certification

    Pediatric Gastroenterology
  • Gender

  • Languages Spoken