New Search 9465 Mark Ellis MD (714) 633-6363 Primary Specialties Allergy and Immunology Secondary Specialties Pediatric Allergy and Immunology Medical Groups & Affiliations St. Joseph Heritage Medical Group St. Joseph Hospital Affiliated Physicians Primary Office Address: 725 W. La Veta Ave. Suite 100 Orange, CA 92868 Phone: (714) 633-6363 Fax: (714) 633-0178 Hours: Mon - Fri: 8:30 a.m. - 5 p.m. Weekend Hours: Sat8:30AM - 12:00PM Web Page: www.sjo.org Recommend this Physician Request an Update for this Physician Get Directions The patient rating score is based on responses and comments from Press Ganey. Responses are measured on a 10 point scale, with 10 being the best score. These scores are then translated to a 5 point scale in order to display results in a 5 Star rating. Comments are also gathered from the same survey and displayed in their entirety with the exception of any language that may be considered libel, or may contain private health information, or is unrelated to the provider being reviewed. Learn more about Press Ganey star rating calculations Areas of Expertise Certified by the American Board of Allergy and Immunology as well as the American Board of Pediatrics.