Dr. Johnston is the founder of the Interventional Pain Institute in Baton Rouge, LA. He is also the founder of the Spine and Migraine Institute in Metaire, LA. Dr. Johnston provides diagnosis and pain management treatment to individuals with chronic pain from various spine pathologies. He employs a multimodal approach of therapies and disciplines to individualize pain management treatment plans. He also serves as the Medical Director of the Advanced Pain Institute Treatment Center, an ambulatory surgery center.


Prior to practicing pain management in the Baton Rouge area, Dr. Johnston held Anesthesiology positions in Massachusetts. He served as a Clinic Associate Anesthesiologist at Partners Healthcare, Brigham & Women's Hospital Department of Anesthesiology and Perioperative and Pain Management. Concurrently, he was a Staff Anesthesiologist at Norwood Hospital in Norwood, Massachusetts.

Dr. Johnston is currently the Medical Director of the Advanced Pain Institute Treatment Center in Hammond, LA. It is an ambulatory surgery center and he supervises over 70 cases per week. He is also the elected Vice President of the Young Physicians Section of the Louisiana State Medical Society. He firmly believes it is important to maintain a presence throughout Louisiana in order to make patient care a top priority.

Dr. Johnston and his wife, Shelly, reside in Baton Rouge and enjoy spending time with their four kids, Abram, Faith, Ella Kate and Samantha.

      Interventional Pain Institute:    

   Specialized Treatment of:                                                                          

  • low back pain                                                          
  • neck pain                                                                     
  • cancer pain                                                                  
  • limb pain                                                                     
  • abdominal pain                                                           
  • headaches                                                                    
  • fibromyalgia                                                                
  • joint pain
  • muscle spasticity
  • migraines

     Treatment Options Include:

  • Comprehensive medication management
  • Physical therapy
  • Injections and nerve root blocks
  • Minimally invasive procedures
  • Pain and Baclofen pump implants
  • Nerve stimulator implants

                                                             "Serving People, Treating Pain"

View Dr. Barrett Johnston's Resume


'Everyone is so friendly and helpful. They take the time with you instead of rushing you through, so it feels like they really care about you and how you are feeling. I am so very pleased with the whole group of people working there, and so very blessed to have found Dr. Johnston!!! And his wonderful staff!!!'