Katy K. Tsai, MD

Medicare activity in 2024

Official CMS public-use data for Katy K. Tsai, 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 high level of medical decision making, if using time, 40 minutes or more (99215)319 services
2. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)124 services
3. New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)47 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)33 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 cholesterol69%
• High blood pressure68%
• Arthritis39%
• Ischemic heart disease26%
• Chronic kidney disease25%
• Anxiety22%

Hospitals where Katy K. Tsai works

Medicare's Facility Affiliation Data lists Katy K. Tsai 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.

• 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 Katy K. Tsai is enrolled with Medicare (CMS data updated October 2, 2026).

• 2330 Post StSan Francisco, CA 94115 (415) 476‑4029
• 400 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000

Group practices

Medicare enrollment lists Katy K. Tsai as a member of these groups (CMS data updated October 2, 2026).

• University of California San Francisco1,839 clinicians in the group
• UCSF Medical Group Business Services1,598 clinicians in the group

Specialties

• Internal Medicineprimary
• Hematology/Oncologyalso

Find other Internal Medicine doctors in California →

Other internal medicine doctors in San Francisco

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

• Victor Kwok, MD
• David A. Elson, MD
• Lisa G. Chui, MD
• Philip F. Nakashima, MD
• Shawn Hassler, MD
• Christina Yoon, MD
• Kirsten Kangelaris, MD
• Jeremy M. Weiser, MD

All internal medicine doctors in San Francisco →

Other clinicians in University of California San Francisco

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

• Alfred Chung, MD
• Rosalind M. Delisser, NP
• Whitney L. Romero, NP
• Daniel L. Bui, MD
• Sergio C. Lanata, MD
• Liang D. Ge, 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