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R. Towner Lapp

R. Towner Lapp, MD

Subspecializing in Internal Medicine

“Witnessing the relationship between physician and patient is the thing that inspired me to be a physician myself.“

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Office Information

About Me

R. Towner Lapp, MD, is a gastroenterologist at Avera Medical Group Gastroenterology in Sioux Falls, SD. Trust him and the rest of Avera’s gastroenterology team to help you manage your digestive health and work toward effective treatment for conditions and diseases.

Treating Patients as Family

Dr. Lapp is dedicated to providing the very best care possible. “My philosophy is to approach every patient with the same care and devotion as I would my very own family members.”

Expert Care for Complete Digestive System

Dr. Lapp treats disorders of the pancreas, bile duct system, esophagus and colon.

Some of his areas of special interest include:

  • ERCP procedures that treat disorders of the pancreas and liver
  • Endoscopic ultrasound for diagnosing disease of the digestive tract
  • Endoscopic mucosal resections
  • Colonoscopy and upper endoscopy
  • Other advanced endoscopy procedures

Active Lifestyle

Dr. Lapp enjoys spending time with his wife and two children. Other interests include running, traveling and reading.



2008 - University of South Dakota School of Medicine, Vermillion, Medical School


2011 - University of Wisconsin Hospital and Clinics, Madison, Internal Medicine


2014 - University of Nebraska Medical Center, Omaha, NE, Gastroenterology and Hepatology

2015 - University of Michigan Medical Center, Ann Arbor, MI, Advanced Endoscopy

Professional Memberships

American Medical Association


American Board of Internal Medicine

This directory contains information about the provider members of Independent Health Care Associates, Avera Health and all Avera entities, members of the Avera Medical Group, and employed select providers with Avera McKennan, Sioux Falls, SD and Avera Marshall, Marshall, MN and physicians with hospital privileges at Avera St. Luke's, Aberdeen, SD; Avera Sacred Heart, Yankton, SD; Avera Queen of Peace, Mitchell, SD; Avera St. Mary's, Pierre, SD.

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Moving Health Forward

Avera is a health ministry rooted in the Gospel. Our mission is to make a positive impact in the lives and health of persons and communities by providing quality services guided by Christian values.

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