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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.

Arash Mahajerin, MD

  • Pediatric Hematology Oncology
Additional Language Spoken
Medical Groups & Affiliations
  • St. Joseph Heritage Medical Group
  • St. Joseph Hospital Affiliated Physicians
CHOC Children's Specialists - Hematology Oncology
1201 West La Veta Avenue
Orange, CA 92868
Accepting New Patients

Primary Office

CHOC Children's Specialists - Hematology Oncology
1201 West La Veta Avenue
Orange, CA 92868
Get Directions
(714) 509-8636
(714) 509-4748

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Pediatric Hematology Oncology
    Education & Training
    • Internship
      Riley Hospital For Children - 2010
    • Fellowship
      Riley Hospital For Children - 2013
    • Medical School
      Michigan State University - 2007
  • Biography


    Dr. Arash Mahajerin is a dedicated physician-scientist with a focus on coagulation (bleeding and clotting) disorders in children. His main areas of research interest include the prevention of blood clots in children, utilization and cost-effectiveness of thrombophilia testing, coagulopathy of trauma, and health economics of bleeding and clotting disorders. He is a co-founder of the Children’s Hospital-Acquired Thrombosis (CHAT) Registry and is actively involved in many clinical research endeavors locally, nationally, and internationally.

    Dr. Mahajerin is board certified in Pediatrics and Pediatric Hematology/Oncology. Prior to joining CHOC Children’s, Dr. Mahajerin attended medical school at Michigan State University/College of Human Medicine. He performed his pediatric residency and conducted his fellowship training in pediatric hematology-oncology at Riley Hospital for Children/University of Indiana.