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Gateway Medical Group of San Diego  ​
was established on July 1, 1994 by Dr. Ronald Sanzone and Dr. Merritt Matthews in National City. Since that time, Gateway has expanded to two locations (National City and Chula Vista). Primary care is now offered by five Board Certified Physicians, a Physician Assistant, and a Nurse Practitioner. 
Our mission is to provide medical care of the highest standard to all people of all ages in San Diego.

Meet our Team.

Meet our Team.


Meet our Doctors.

Our Staff.

National City
Chula Vista
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