Maxim L. Ritzenberg, MD

Medicare activity in 2024

Official CMS public-use data for Maxim L. Ritzenberg, 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. Emergency department visit with high level of medical decision making (99285)52 services
2. Emergency department visit with moderate level of medical decision making (99284)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 pressure74%
• High cholesterol53%
• Diabetes39%
• Arthritis39%
• Chronic kidney disease38%
• Heart failure38%

Hospitals where Maxim L. Ritzenberg works

Medicare's Facility Affiliation Data lists Maxim L. Ritzenberg 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.

• Zuckerberg San Francisco General Hospital & Trauma CenterSan Francisco, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050228

Practice locations

Addresses where Maxim L. Ritzenberg is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 12; the Medicare profile lists all.

• 1310 El Camino Real, Suite I JSan Bruno, CA 94066 (650) 270‑2395
• 199 W Portal AveSan Francisco, CA 94127 (415) 821‑8798
• 2288 Market StSan Francisco, CA 94114 (415) 964‑4855
• 2395 Lombard StSan Francisco, CA 94123 (415) 796‑2242
• 2895 Diamond StSan Francisco, CA 94131 (415) 964‑4866

Group practices

Medicare enrollment lists Maxim L. Ritzenberg as a member of these groups (CMS data updated October 2, 2026).

• County of Santa Clara1,022 clinicians in the group
• UCSF Health Medical Foundation66 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in San Bruno

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

• David A. Rossi, MD
• John W. Elliott, MD
• Kurt H. Kunzel, MD
• Karen L. Feeney, MD
• Vikram S. Mahal, MD
• John A. Horning, MD
• Steven K. Polevoi, MD
• Peter C. Wroe, MD

All emergency medicine doctors in San Bruno →

Other clinicians in County of Santa Clara

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

• Tracey S. Hong, MD
• Jonathan L. Le, MD
• Abha B. Kumar
• Esequiel Rodriguez Jr., MD
• Ramesh K. Gopi, MD
• David Lin, 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