Gregg L. Tolliver, MD

Medicare activity in 2024

Official CMS public-use data for Gregg L. Tolliver, 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)562 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)167 services
3. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)162 services
4. New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)30 services
5. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)21 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%
• Arthritis53%
• Chronic kidney disease48%
• Ischemic heart disease44%
• Depression39%

Hospitals where Gregg L. Tolliver works

Medicare's Facility Affiliation Data lists Gregg L. Tolliver 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.

• Marinhealth Medical CenterGreenbrae, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050360
• Novato Community HospitalNovato, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050131

Practice locations

Addresses where Gregg L. Tolliver is enrolled with Medicare (CMS data updated October 2, 2026).

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

Group practices

Medicare enrollment lists Gregg L. Tolliver as a member of this group (CMS data updated October 2, 2026).

• Regents Univ of California UCSF283 clinicians in the group

Specialties

• Infectious Diseaseprimary

Find other Infectious Disease doctors in California →

Other infectious disease doctors in San Francisco

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

• Deborah S. Yokoe, MD
• Andrew D. Kerkhoff, MD
• Sophia Y. Lewis, MD
• Melicent C. Peck, MD
• Erin J. Delacruz, MD
• Liza Valdivia, MD
• Monica Fung
• Kyla D. Sherwood, MD

All infectious disease doctors in San Francisco →

Other clinicians in Regents Univ of California UCSF

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

• Alexander J. Abeyta, PT
• Pankaj Malhotra, MD
• Justin Krogue, MD
• Stephan O. Venables, PT
• Merrill R. Nisam, MD
• Heather Carlberg, 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