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About Us

Yuill Black, M.D. and Michael R. Kletz, M.D., P.C. is an Allergy/Immunology practice consisting of two board certified allergists.  We have two offices located in Northern Virginia and one office in Washington, D.C. 

Our practice has provided adult and pediatric allergy services to the greater Washington metropolitan area for over 50 years.

We strive to provide efficient and quality care in a relaxed environment.



  • We accept most insurance plans
  • Se habla español


Meet the Physicians

Michael R. Kletz, M.D. is a Diplomate of the American Board of Allergy and Immunology, Diplomate of the American Board of Internal Medicine, Fellow of the American Academy of Allergy, Asthma, and Immunology, Fellow of the American College of Allergy, Asthma, and Immunology, and Fellow of the American College of Physicians.

Dr. Kletz completed his internship and residency in Internal Medicine at the University of Maryland - University Hospital and his fellowship in Allergy and Immunology at University of Medicine and Dentistry of New Jersey - University Hospital.

Dr. Kletz is listed in Washingtonian Magazine's Top Doctors of 2005 and 2012, Northern Virginia Magazine's Top Doctors of 2011, 2012, and 2013, U.S. News & World Report's Top Doctors of 2012, and Castle Connolly Top Doctors: Washington-Baltimore of 2012.  He is associated with numerous hospitals in the Washington, D.C. area and is an Assistant Professor of Medicine at Georgetown University Hospital.  He enjoys giving lectures to other physicians in the community regarding the diagnosis and treatment of allergic conditions.

Appaji Gondi, M.D. is a Diplomate of the American Board of Allergy and Immunology, Diplomate of the American Board of Pediatrics, and Fellow of the American Academy of Allergy, Asthma, and Immunology.

Dr. Gondi finished his internship and residency in Pediatrics at New York Medical College - Saint Vincent's Hospital and Medical Center and his fellowship in Allergy and Immunology at State University of New York Health Sciences Center - Downstate Medical Center.

Dr. Gondi is listed in Washingtonian Magazine's Top Doctors of 2010 and in Northern Virginia Magazine's Top Doctors of 2011, 2012, and 2013.  He enjoys lecturing colleagues in the field of Allergy and Immunology.