R. G. “Trip” Johnstone III, M.D.
Contact Information

R. G. “Trip” Johnstone III, M.D.

  • NPI Number:

Dr. Johnstone has been living in the upstate area for over 35 years. Dr. Johnstone and his wife enjoy this area and its residents which also consist of their three grown children.

“My initial interest in allergy comes from my own experience with allergies and asthma and the treatments I received growing up in various parts of the country before finally moving here in high school and eventually setting up an allergy practice 20 years ago.”

He believes patient involvement in the determination of a treatment plan is more likely to lead to a positive outcome.

“My philosophy in treating is to try to create a partnership with my patients where we identify the causes of their allergic disease, discuss possible treatment options and then come up with a custom plan of treatment that is both practical for the patient and likely to be effective.”

When not working, Dr. Johnstone enjoys being outdoors playing golf or exercising and spending time with his family.

Medical School
  • University of South Carolina School of Medicine
  • General Surgery , Spartanburg Regional Medical Center
  • Pediatrics , Greenville Memorial Hospital
  • Wake Forest University
Board Certification
  • The American Board of Allergy & Immunology
Insurances Accepted
  • Absolute Total Care
  • Aetna
  • Bon Secours St Francis - Health Partners
  • Cigna
  • Cigna HealthSpring
  • Clear Spring Health
  • Clover Health
  • Employers Health Network
  • Eon Health
  • GEHA
  • Humana Medicaid
  • MedCost
  • Molina
  • Multiplan/PHCS/Beechstreet
  • Partners Direct Health PPO Network
  • Prime Health Services
  • Regional HealthPlus
  • Select Health
  • Tricare East - Humana Military
  • United Health Care
  • Wellcare
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