Yen-Chung A. Lee, MD

Medicare activity in 2024

Official CMS public-use data for Yen-Chung A. Lee, 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. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)115 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)52 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)44 services
4. Repair of groin hernia using an endoscope (49650)40 services
5. Removal of gallbladder using an endoscope (47562)31 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 cholesterol75%
• Arthritis45%
• Chronic kidney disease38%
• Ischemic heart disease26%
• Diabetes25%

Hospitals where Yen-Chung A. Lee works

Medicare's Facility Affiliation Data lists Yen-Chung A. Lee 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.

• Adventist Health SonoraSonora, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050335
• Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
• 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 Yen-Chung A. Lee is enrolled with Medicare (CMS data updated October 2, 2026).

• 300 Pasteur DrStanford, CA 94305 (650) 723‑4000

Group practices

Medicare enrollment lists Yen-Chung A. Lee as a member of this group (CMS data updated October 2, 2026).

• Stanford Health Care3,122 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in California →

Other general surgeons in Stanford

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

• Ahmer Irfan, MD
• Paul M. Maggio, MD
• Brooke H. Gurland, MD
• Irene L. Wapnir, MD
• Malerie S. Pratt, MD
• Monica M. Dua, MD
• Daniel J. Delitto, MD
• Stephan Busque, MD

All general surgeons in Stanford →

Other clinicians in Stanford Health Care

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

• Nichole V. Maharaj, CNA
• Corinne E. Wertz, NP
• Chung Kwan Yen, DDS
• Jocelyn V. Hull, MD
• Sahil H. Shah, MD
• Matthew K. Schoen, 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