Ralph P. Diaz, MD Return to Fresno Area Businesses Directory Ralph P. Diaz, MD Claim Listing Return to Fresno Area Businesses Directory Description Details Address 7471 N Fresno St City Fresno State California ZIP Code 93720 Phone (559) 436-4500 Listing Category Allergy and Immunology - Listings Please login to claim this listing. Username*: Email*: Password*: Log in | Lost your password?