Justin L. Ren, MD

Medicare activity in 2024

Official CMS public-use data for Justin L. Ren, 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. 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)14 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)12 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 cholesterol56%
• High blood pressure49%
• Arthritis33%
• Depression28%

Hospitals where Justin L. Ren works

Medicare's Facility Affiliation Data lists Justin L. Ren 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 Justin L. Ren is enrolled with Medicare (CMS data updated October 2, 2026).

• 185 Berry StSan Francisco, CA 94107 (415) 476‑1000
• 225 California DrBurlingame, CA 94010 (650) 341‑9131
• 3100 San Pablo AveBerkeley, CA 94702 (510) 985‑5020
• 400 Parnassus AveSan Francisco, CA 94143

Group practices

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

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

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in San Francisco

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

• Pinchieh Chiang, DO
• Saul Tapia Ruiz, MD
• Norman G. Hearst, MD
• Lawrence G. Shore, MD
• Joanna J. Eveland, MD
• Martin H. Escandon, MD
• Emily Fink, MD
• Juan Carlos Lozano, MD

All family doctors in San Francisco →

Other clinicians in UCSF Medical Group Business Services

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

• O'Rese Knight, MD
• Alyssa Nylander, MD
• Marie E. Rinaldi, NP
• Tracy A. Ward, NP
• Blake E. Taylor, MD
• Aaron J. Clark, 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