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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.

Katrina Tesmer, MD

Specialty
  • Neonatology
    (Board Certified)
Additional Language Spoken
English
Medical Groups & Affiliations
  • St. Joseph Heritage Medical Group
  • St. Joseph Hospital Affiliated Physicians
Address
455 South Main Street
Orange, CA 92868
Accepting New Patients

Primary Office

Address
455 South Main Street
Orange, CA 92868
Get Directions
Phone
(714) 509-4373
Fax
(714) 532-7800
Hours
Mon - Fri: 9 a.m. - 5 p.m.

Secondary Office

Address
CHOC Children's Specialists - 1201 La Veta Ave.
1201 West La Veta Avenue
Orange, CA 92868
Phone
(888) 770-2462
Fax
(855) 246-2329

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Neonatology
      (Board Certified)
    Education & Training
    • Medical School
      Medical Academy of Gdansk
    • Internship
      White Memorial Medical Center - 1994
    • Internship
      White Memorial Medical Center - 1994
    • Residency
      White Memorial Medical Center - 1996
    • Fellowship
      LAC/USC Women and Children's Hospital - 1999
  • Biography

    Biography

    Biography
    Katrina Tesmer, M.D. provides the full range of neonatal medical services. Dr. Tesmer serves as the Medical Director of the Neonatal Intensive Care Unit at Western Medical Center in Santa Ana. Dr. Tesmer is board certified in pediatrics and neonatal-perinatal medicine. She served her fellowship and residency through the University of Southern California and White Memorial Medical Center in Los Angeles, respectively. She graduated from the Medical School of Gdansk, Poland and completed her internship at Mlava Hospital in Poland.