Rajitha Premartatne, MD, FACR
Practice: Arizona Arthritis & Rheumatology Associates
Specialty: Rheumatology
Office locations: Lake Havasu, AZ
Dr. Premaratne earned his medical degree from Riga Stradins University in Latvia before relocating to the United States for his medical training. He completed his Internal Medicine residency at St. John’s Mercy Medical Center in Saint Louis, Missouri, where he also served as junior faculty and Chief Resident. Following his residency, Dr. Premaratne completed a rheumatology fellowship at the University of Kansas Medical Center. In 2012, he moved to Lake Havasu City, Arizona, to address the need for rheumatology care in Mohave County.
Dr. Premaratne earned his medical degree from Riga Stradins University in Latvia before relocating to the United States for his medical training. He completed his Internal Medicine residency at St. John’s Mercy Medical Center in Saint Louis, Missouri, where he also served as junior faculty and Chief Resident. Following his residency, Dr. Premaratne completed a rheumatology fellowship at the University of Kansas Medical Center. In 2012, he moved to Lake Havasu City, Arizona, to address the need for rheumatology care in Mohave County.
AARA: Lake Havasu
Suite 102
Lake Havasu, AZ 86403
Dr. Premaratne earned his medical degree from Riga Stradins University in Latvia before relocating to the United States for his medical training. He completed his Internal Medicine residency at St. John’s Mercy Medical Center in Saint Louis, Missouri, where he also served as junior faculty and Chief Resident.
Following his residency, Dr. Premaratne completed a rheumatology fellowship at the University of Kansas Medical Center. In 2012, he moved to Lake Havasu City, Arizona, to address the need for rheumatology care in Mohave County. He managed his own practice until merging with Arizona Arthritis & Rheumatology Associates (AARA) in August 2026.
Dr. Premaratne has also completed specialized training in musculoskeletal ultrasound-guided injections to improve patient diagnosis and outcomes. He currently maintains admitting privileges at Havasu Regional Medical Center, where he serves on the Board of Trustees.
In his spare time, Dr. Premaratne enjoys traveling with his family and participating in outdoor activities.

Very pleased with him
Was very informative
Terrific as usual
Professional, friendly and on time appointment!
Knowledgeable and listens
Dr Raj listened to my concerns and gave me good advice for my health problems.
Actually listens and discusses options for your care.
Meeting with Dr Raj went well. Good report on blood work and he called in prescription that I needed.
Very good to get things done right away
Very Good Rheumatologist.