Dr. Katrina J. Tesmer, Neonatology

Dr. Katrina J. Tesmer, Neonatology

  • Katrina J Tesmer MD
  • Office: 714-509-4373
  • Specialty: Neonatology
  • Board Certified: Neonatal-Perinatal Medicine
  • Additional Languages: Polish

Dr. Tesmer 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.

Katrina J Tesmer MD is on staff at CHOC Hospital in Orange and CHOC Mission Hospital.


CHOC Hospital
1201 W La Veta
Orange, CA 92868

St. Jude Medical Center
101 E. Valencia Mesa Dr.
Fullerton, CA 92835

Western Medical Center
1001 N. Tustin Ave.
Santa Ana, CA 92705


  • Medical School
    Gdansk Medical Academy, Gdansk, Poland
  • Neonatology Fellowship
    Los Angeles County University of Southern California, Los Angeles, CA
  • Pediatrics Residency
    White Memorial Medical Center, Los Angeles, CA

Administrative Appointments

  • Neonatology, CHOC Specialists

Our neonatologists commonly treat the following conditions in newborns and babies: