Our Story

We are a group of seven nephrologists practicing mainly in Olympia, Washington. Our referral area extends to the five counties of Southwest Washington. Our practice is limited to the west by the Pacific Ocean, to the north by the Tacoma area and to the south, by Vancouver-Longview, WA and Portland metropolitan areas.

We are the only Nephrology group in the area which was founded in 1973. Our group is well considered by the local medical communities for our excellent quality of care ever since.

Our most senior associate, Dr. Vo Nguyen (University of Michigan, Ann Arbor) started in 1992. Our second associate, Dr. Seth Thaler (University of Colorado, Denver) joined the program in 1998. Our third associate, Dr. Niranjan Sivakumar (U. Nevada School of Medicine) joined in 2016. Our fourth associate is Tsering Dhondup, MBBS, MPH (Maulana Azad Medical College New Delhi, India). Our fifth associate, Dr. Thuan Nguyen, MD (AUC School of Medicine St. Maarten) joined our practice in 2019. Our sixth associate, Dr. Hetal Shah (University of Missouri, Kansas City) joined in 2022. Our seventh and most recent associate, Dr. Hanan Batarseh (Oregon Health & Science University) joined in 2022. Our dietician is Mary Jennings, RD.

Our practice is mainly Nephrology, including renal consultation, pre-ESRD care, dialysis and transplant follow up. We provide services at 7 area Hemodialysis units. Providence St. Peter Hospital is located directly across the street from our office.

Our total dialysis population is currently about 400 patients and continues to increase annually. Our hemodialysis program is considered by the Pacific Northwest Renal Network (covering the 5 NW states and based in Seattle) to be the best practice in vascular access (84% fistula rate for the whole program vs. 31% for the US average) with lower morbidity. The Aberdeen unit averaging 92% AVF rate, 8% catheter, has probably one of the best vascular access programs in the country.

Memorial Nephrology’s physicians provide for all aspects of the prevention and treatment of kidney disease, including but not limited to:

  • Acute Kidney Failure
  • Chronic Kidney Failure
  • Acute and Chronic Glomerulonephritis
  • Diabetic Kidney Disease
  • Polycystic Kidney Disease
  • Anemia Associated with Kidney Disease
  • Management of Inpatient Dialysis Treatments
  • Management of Outpatient Dialysis Treatments
  • Management of Kidney Transplant Patients
  • Management of Peritoneal Dialysis Patients
  • Kidney Transplant Preparation
  • Nutritional Information and Support


  • Ph: (360) 413-8121

  • Toll free: 1 (866) 616-2289

  • Fax: (360) 413-8865

  • 3525 Ensign Rd NE, Ste K
    Olympia, WA 98506


Monday – Friday 8:30 – 5:00
Saturday Closed
Sunday Closed