Diane E. Tjornhom, MD

Practice locations

Addresses where Diane E. Tjornhom is enrolled with Medicare (CMS data updated October 2, 2026).

• 9333 Rosecrans AveBellflower, CA 90706 (562) 461‑3000
• 9449 Imperial HwyDowney, CA 90242 (562) 461‑3000

Group practices

Medicare enrollment lists Diane E. Tjornhom as a member of this group (CMS data updated October 2, 2026).

• Southern California Permanente Medical Group11,293 clinicians in the group

Specialties

• Internal Medicineprimary
• Rheumatologyalso

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Bellflower

Clinicians with the same Medicare primary specialty in Bellflower, CA — not a recommendation.

• Brian Dang, MD
• Ai P. Pham, MD
• Manuel P. Fernandez, MD
• Denise H. Park, MD
• Darren K. Shimabukuro, MD
• Jared A. Geibig, MD
• Christian Thiim, DO
• I-Hsiang Shu, MD

All internal medicine doctors in Bellflower →

Other clinicians in Southern California Permanente Medical Group

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Nancy McBride, OD
• Joanne M. Bautista, MD
• Saba Ahmad, MD
• Jimmy Apisakkul, DO
• Nimitta N. Lathiya, DO
• Brian Dang, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
3. Medicare Care Compare — official Medicare tool to look up clinicians