Katharine B. Simmons, MD

Practice locations

Addresses where Katharine B. Simmons is enrolled with Medicare (CMS data updated October 2, 2026).

• 2500 Merced StSan Leandro, CA 94577 (510) 454‑1000

Group practices

Medicare enrollment lists Katharine B. Simmons as a member of this group (CMS data updated October 2, 2026).

• Permanente Medical Group Inc10,996 clinicians in the group

Specialties

• Obstetrics/Gynecologyprimary

Find other Obstetrics/Gynecology doctors in California →

Other OB-GYNs in San Leandro

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

• Chitra P. Akileswaran, MD
• Sarah Gan, MD
• Marie L. Lacour, MD
• Jamie M. Gonzalez, MD
• Mary D. Crisham Janik, MD
• Clara Lee, DO
• Stephanie F. Kong, MD
• Vanessa N. Olsen, MD

All OB-GYNs in San Leandro →

Other clinicians in Permanente Medical Group Inc

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

• Dana I. Rosca, MD
• Charles B. Hare, MD
• John W. Brainard, MD
• Frank K. Liou, MD
• Jaehee Kim, MD
• Cameron Jones, 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