About Syed N. Zaidi, MD. Syed Navaid Zaidi, MD is a family medicine doctor and primary care doctor who practices at Syed N. Zaidi, MD Practice located at 2102 S Piney Point Rd in Houston, TX 77063 (Harris County). Dr. Syed N. Zaidi has 15+ years of experience in family medicine. Education. Syed N. Zaidi, MD earned a degree of a Doctor of Medicine..