Seon K. Tjoe, MD

Medicare activity in 2024

Official CMS public-use data for Seon K. Tjoe, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)177 services
2. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)75 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)49 services
4. Administration of influenza virus vaccine (G0008)17 services
5. Influenza vaccine, inactivated (90653)16 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High cholesterol73%
• High blood pressure63%
• Arthritis35%
• Osteoporosis25%
• Diabetes22%
• Anxiety17%

Hospitals where Seon K. Tjoe works

Medicare's Facility Affiliation Data lists Seon K. Tjoe at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Eden Medical CenterCastro Valley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050488
• Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050283

Practice locations

Addresses where Seon K. Tjoe is enrolled with Medicare (CMS data updated October 2, 2026).

• 3200 Kearney StFremont, CA 94538 (510) 490‑1222
• 4050 Dublin BlvdDublin, CA 94568 (925) 875‑6100
• 7683 Southfront RdLivermore, CA 94551 (800) 478‑8837

Group practices

Medicare enrollment lists Seon K. Tjoe as a member of this group (CMS data updated October 2, 2026).

• Sutter Bay Medical Foundation3,829 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Fremont

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

• Kanwalpreet K. Hundal, MD
• David Wang, MD
• Kashmira S. Ragi, MD
• Walter W. Cheng, MD
• Veronica I. Lagos-Jaramillo
• Vallari Shukla, MD
• Padmavathi Kudaravalli, MD
• Lakshmi Mahendran, MD

All internal medicine doctors in Fremont →

Other clinicians in Sutter Bay Medical Foundation

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

• Robert N. Joodi, MD
• Kanwalpreet K. Hundal, MD
• Ganesh Krishna, MD
• Blaise Baxter, MD
• Hanbit Choi, NP
• Gabriel J. David, 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. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians