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About St. Joseph Health

SJH provides a full range of care facilities including 16 acute care hospitals, home health agencies, hospice care, outpatient services, skilled nursing facilities, community clinics and physician groups. All of our hospital and home health entities are accredited by the Joint Commission. In our award-winning facilities, SJH maintains a "continuum of care," matched to the diverse needs of the urban centers, smaller cities and rural communities who depend on us every day.

Mark S. Sugar, MD

  • Allergy and Immunology
Additional Language Spoken
Medical Groups & Affiliations
  • Mission Hospital Affiliated Physicians
Allergy & Asthma Associates - Mission Viejo
27800 Medical Center Road
Suite 244
Mission Viejo, CA 92691
Accepting New Patients

Primary Office

Allergy & Asthma Associates - Mission Viejo
27800 Medical Center Road
Suite 244
Mission Viejo, CA 92691
Get Directions
(949) 364-2900
(949) 365-0117

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Allergy and Immunology
    Education & Training
    • Medical School
      University of Maryland- Medical School
    • Internship
      San Bernardino County Medical Center
    • Residency
      Kaiser Foundation Hospital - Fontana
    • Fellowship
      UCLA Medical Center - 1985
    Areas of Interest


  • Biography


    “My interest in the field of allergy began in the early 1980s when the awakening field of immunology provided an understanding of the causes of many allergic diseases. I had previously had several years of training in family medicine and pediatrics in the US Air Force and in the US Public Health Services, but I wanted to enhance my knowledge of the exciting new field of immunology and allergy. I completed a fellowship in this specialty at UCLA in 1985 and opened an office in private practice in Orange County thereafter. I have been active in local and state allergy societies over the years and most recently have served as president of the California Society of Allergy and Immunology (2009). For 25 years I have been an associate clinical professor at UCI teaching residents and fellows in the department of allergy-immunology.

    “My passion and inspiration have been practicing medicine and I continue to love the most important work I do, caring for patients of all ages with allergies and immune system disorders. My goals are always to understand my patients’ problems, find solutions to their often challenging allergic disorders and provide them with long-lasting relief of their symptoms so they can enjoy active, worry-free lives.”
    American Board of Allergy and Immunology American Board of Pediatrics
    Areas of Expertise
    Asthma and Allergy, Immune Deficiencies