Andrew M. Posselt, MD

Medicare activity in 2024

Official CMS public-use data for Andrew M. Posselt, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)57 services
2. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)27 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)22 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%
• Chronic kidney disease73%
• High cholesterol63%
• Diabetes63%
• Ischemic heart disease38%
• Depression36%

Hospitals where Andrew M. Posselt works

Medicare's Facility Affiliation Data lists Andrew M. Posselt 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 Andrew M. Posselt is enrolled with Medicare (CMS data updated October 2, 2026).

• 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000

Group practices

Medicare enrollment lists Andrew M. Posselt as a member of these groups (CMS data updated October 2, 2026).

• UCSF Medical Group Business Services1,598 clinicians in the group
• UCSF Dept of Surgery215 clinicians in the group

Specialties

• General Surgeryprimary
• Internal Medicinealso

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.

• Nancy L. Ascher, MD
• Emmanuel Ocham Bua
• Rochelle A. Dicker, MD
• Robert Osorio
• Garrett R. Roll, MD
• Tasce R. Bongiovanni, MD
• Althaea Z. Greenstone, MD
• Kevin R. Hiler, MD

All general surgeons in San Francisco →

Other clinicians in UCSF Medical Group Business Services

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

• Nancy L. Ascher, MD
• Max Brondfield, MD
• Michael A. Diaz, MD
• Yiyi Wang, OD
• Marya G. Zlatnik, MD
• Joseph Sabatino, 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