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Katherine D. Williamson, MD
Practice accepting new patients.

Katherine D. Williamson, MD

(949) 388-1798
Primary Specialties
  • Pediatrics
    (Board Certified)
Medical Groups & Affiliations
  • Mission Hospital Affiliated Physicians

Primary Office

777 Corporate Dr.
Suite 250
Ladera Ranch, CA 92694
(949) 388-1798
(949) 388-6495
Mon - Fri: 8:30 a.m. - 5 p.m.
Web Page:
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Physician Bio

Dr. Roberts is inspired every day by the relationships she develops with children and their families. She believes that children are the center of every family, and being a pediatrician is much more than treating their physical health. “It is important to me to be a positive role model and an advocate for my patients. I strive to be an active team player in a child’s life and I relish the opportunity to be a part of parents’ teams to help guide children to adulthood and help them realize their potential.”


  • Medical School:
    University of California- San Francisco- School of Medicine - San Francisco, CA
  • Internship:
    Children's Hospital of Orange County
  • Residency:
    Children's Hospital of Orange County
  • Board Certified in Pediatrics

Insurance ID Numbers

Aetna: *832441
Blue Cross: *0XL119
Blue Shield: 0A1129850
CIGNA: 6910016006
CIGNA Select (SJH): 6910016009
Health Net: 3207174743
United Healthcare: *0183520089

*Provider ID is the same for both HMO and Medicare Advantage Plans