Providing exceptional and compassionate care


Washington Nephrology Associates, LLP (WNA) is a partnership of physicians practicing Nephrology in the Greater Metropolitan DC and Baltimore area since 1984. The group’s history began much earlier, however, with the professional association of Larry Siegel MD, James H. Knephshield and William Criksena MD in 1965. These nephrologists established the Metropolitan Washington Renal-Dialysis Center in Bethesda, Maryland, the first outpatient dialysis center in Washington DC area, and worked with Congress on the landmark 1972 legislation that extended Medicare benefits to patients with end-stage renal disease. In the 1980s, they joined forces with several other nephrologists in the Maryland and Virginia suburbs, and Washington Nephrology Associates was officially born. Over the years, the partnership has continued to grow, and now has a strong presence in Washington, Baltimore, Bethesda, Alexandria, Takoma Park, Silver Spring, Fairfax, Woodbridge, and Annapolis. Our physicians are all board-certified or board-eligible in nephrology. A number of our nephrologists are on the faculty at the Georgetown University School of Medicine and the George Washington University School of Medicine and Health Sciences, and are active in teaching medical students and residents. Many of our physicians are listed as top nephrologists in Washingtonian Magazine, as well as other local publications.

Office Locations

Washington Nephrology has multiple offices around DMV area. Check out Our Offices

Do you take my insurance?

We accept most plans! Insurance coverage will be verified when making your first appointment. Learn More…

Learn about Transplant

If you are interested in receiving a kidney transplant, plan to discuss this matter with your doctor.   Learn More.

Looking for a dialysis unit?

Our physicians cover a large number of dialysis units in the DC metro area. Find a dialysis unit Learn More…

Kidney Care Education Classes

To learn more about kidney disease,  you can take a Kidney Care Education Class.

Diet and Kidney

There are certain food items patients with kidney disease can or cannot eat.  Learn More…

Check us out on Facebook!


Washington Nephrology Facebook group page contains a large number of recent articles covering different aspects of kidney disease, hypertension, dialysis, in addition to nutrition and general health. 

New Research Studies!

Our research center is presently accepting participants for pioneering studies in the areas of uncontrolled hypertension and diabetic kidney disease.

Meet our new providers!

Zaid Hammoodi, MD

Dr. Hammoodi did his Internal Medicine residency at The Brooklyn Hospital Center in Brooklyn, New York, then did Fellowship at Icahn School of Medicine at Mount Sinai Hospital in Manhattan. Learn More.

June Lee, FNP

June worked for 7 years as a team member and team leader in Medical Surgical Intensive Care Unit at Inova Alexandria Hospital. She received her Master’s in Nursing, specializing as a Family Nurse Practitioner, from George Washington University in 2021. Learn more.