Seiji Yamaguchi, MD

Medicare activity in 2024

Official CMS public-use data for Seiji Yamaguchi, 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)15 services
2. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)12 services
3. Preparation of donor kidney for transplantation (50323)11 services
4. Transplantation of donor kidney (50360)11 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 blood pressure75%
• High cholesterol68%
• Chronic kidney disease63%
• Diabetes48%
• Ischemic heart disease37%
• Arthritis28%

Hospitals where Seiji Yamaguchi works

Medicare's Facility Affiliation Data lists Seiji Yamaguchi 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.

• California Pacific Medical Center- Van Ness CampusSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050047
• UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050454

Practice locations

Addresses where Seiji Yamaguchi is enrolled with Medicare (CMS data updated October 2, 2026).

• 1100 Van Ness AveSan Francisco, CA 94109 (415) 600‑0140
• 400 Parnassus AveSan Francisco, CA 94143
• 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000
• 505 Parnassus Ave, M1490San Francisco, CA 94143 (415) 472‑1000
• 521 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000

Group practices

Medicare enrollment lists Seiji Yamaguchi as a member of these groups (CMS data updated October 2, 2026).

• Sutter Bay Medical Foundation3,829 clinicians in the group
• UCSF Medical Group Business Services1,598 clinicians in the group
• UCSF Dept of Surgery215 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in California →

Other general surgeons in San Francisco

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

• Marissa A. Boeck, MD
• Davit Shahmanyan, MD
• Janet Bellingham, MD
• Anthony Squillaro
• Matthew Y. Lin, MD
• Margaret V. Butchy, MD
• John P. Roberts, MD
• Nisha Parmeshwar, MD

All general surgeons in San Francisco →

Other clinicians in Sutter Bay Medical Foundation

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

• Sergio Alvarez, MD
• Nicholas Regennitter, MD
• Leah S. Millheiser, MD
• Pamela N. Peters, MD
• Elizabeth Swenson, MD
• Jerry Chung, 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