San S. Yuan, MD

Medicare activity in 2024

Official CMS public-use data for San S. Yuan, 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. Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)23 services
2. Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)15 services
3. Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)14 services
4. Anesthesia for total hip replacement (01214)13 services
5. Anesthesia for other procedure on top of arm bone and shoulder joint (01630)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 cholesterol75%
• High blood pressure73%
• Arthritis61%
• Diabetes29%
• Chronic kidney disease28%
• Anxiety27%

Hospitals where San S. Yuan works

Medicare's Facility Affiliation Data lists San S. Yuan 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.

• John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050496
• John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050180

Practice locations

Addresses where San S. Yuan is enrolled with Medicare (CMS data updated October 2, 2026).

• 1601 Ygnacio Valley RdWalnut Creek, CA 94598 (925) 939‑3000
• 2000 Mowry AveFremont, CA 94538 (510) 797‑1111
• 2405 Shadelands Dr, Suite 200Walnut Creek, CA 94598 (925) 935‑6700
• 2540 E StConcord, CA 94520 (925) 682‑8200
• 460 N Wiget Ln, Suite AWalnut Creek, CA 94598 (925) 378‑4949

Group practices

Medicare enrollment lists San S. Yuan as a member of this group (CMS data updated October 2, 2026).

• Cep America - Anesthesia PC849 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in California →

Other anesthesiologists in Walnut Creek

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

• Norman M. Gunn, MD
• Nancy Lee, MD
• Matthew F. Giudice, MD
• Jeremy I. Pearl, MD
• James L. Mura, MD
• Steve C. Mendoza, MD
• Kerry A. Klinger, MD
• Samir Dzankic, MD

All anesthesiologists in Walnut Creek →

Other clinicians in Cep America - Anesthesia PC

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

• Yashar Ilkhchoui, MD
• William Doyle
• Abhishek Saluja
• Christopher Vazquez, CNA
• Matthew F. Giudice, MD
• Barry Young, 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