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St. Jude Affiliated Physicians
P.O. Box 4138
Fullerton, CA 92834

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Jonathan Ou, MD
Practice closed to new patients.

Jonathan Ou, MD

(909) 594-8331
Primary Specialties
  • Internal Medicine
    (Board Certified)
Secondary Specialties
  • Pediatrics
    (Board Certified)
Medical Groups & Affiliations
  • St. Jude Affiliated Physician
  • Additional Languages Spoken
    Cantonese, Chinese, Spanish

Primary Office

2707 S. Diamond Bar Blvd.
Suite 104
Diamond Bar, CA 91765
(909) 594-8331
(909) 869-6631
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Physician Bio

As an Internal Medicine and Pediatrics physician, I believe the best foundation of good health care is evidence-based practice, continuity of care, and patient empathy. Maintaing good relations with colleagues is also of vital importance, thus emphasizing the need for frequent and clear communication.


  • Medical School:
    Keck USC School of Medicine - Los Angeles , CA
  • Internship:
    Loma Linda University - Loma Linda , CA
  • Residency:
    Loma Linda University - Loma Linda , CA
  • Board Certified in Internal Medicine
  • Board Certified in Pediatrics

Insurance ID Numbers

Aetna: *691732
Blue Cross: *0DL213
Blue Shield: 00A1131760
CIGNA: 8982226004
CIGNA Select: 8982226006
Health Net: 3206195883
Health Net Senior: n/a
SCAN: n/a
United Healthcare: *0183440070

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