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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.

Experience

Education

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

Residency

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

Fellowship

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

Certifications

American Board of Internal Medicine

Reviews

We value patient feedback and are committed to providing you with information, so you can make informed decisions about your health care, physicians and other providers in your care journey. Patient ratings and comments are gathered from the post-visit experience survey. Learn more.

August 20, 2025
I really liked Dr. Lapp.
July 06, 2025
I appreciated Dr Lapp asking detailed questions and scheduling test to better understand my problem
July 04, 2025
Good
May 11, 2025
The dr was thorough, clearly articulated his diagnosis including future recommendations. The drs friendly demeanor allowed for a comfortable environment to facilitate two way communications.
April 23, 2025
Dr. Lapp was very informative and addressed my concerns.
March 27, 2025
I appreciate having Dr. Lapp take the time to listen to my concerns and questions. He did not rush the appointment or dismiss my concerns. Thank you!
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Directory Disclaimers

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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