McFarland Clinic

Larry Johnston, DO

Accepting New Patients


4.7 out of 5
  • 90 Patient Ratings

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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