McFarland Clinic

Larry Johnston, DO

Accepting New Patients


Primary Clinic

1215 Duff Avenue Office

1215 Duff Ave
Ames, IA 50010

Location Details on 1215 Duff Avenue Office

Patient Testimonials


Medical Interests

  • Inflammatory bowel disease
  • Colon cancer screening
  • Chronic liver disease
  • Endoscopic mucosal resection

Joined McFarland Clinic

August 2022

Education & Professional Certification


  • American Board of Internal Medicine, Internal Medicine


Oklahoma State University College of Osteopathic Medicine, Tulsa, Oklahoma

  • Doctor of Osteopathic Medicine
  • Masters of Science, Biomedical Sciences

Mount Mercy University, Cedar Rapids, Iowa

  • Bachelor of Science, Biology


Oklahoma State University Medical Center, Tulsa, Oklahoma

  • Internal Medicine Internship


Oklahoma State University Medical Center, Tulsa, Oklahoma

  • Internal Medicine Residency


Oklahoma State University Medical Center, Tulsa, Oklahoma

  • Gastroenterology Fellowship

Professional Societies

  • American College of Gastroenterology
  • American Gastroenterological Association
  • American Society of Gastrointestional Endoscopy
  • American Association for the Study of Liver Disease

Professional & Personal Interests

Leadership Roles

  • Member, McFarland Clinic Clinical Coding Committee

Hobbies and Personal Interests

Golf, hiking, spend time with family and dog, traveling, collegiate athletics


Putting Out the Fire: Prevention and Treatment of GERD

Dr. Larry Johnston discusses the prevention and treatment of Gastroesophageal Reflux Disease (GERD).

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