Ernesto Zatarain Rios, MD

Medicare activity in 2024

Official CMS public-use data for Ernesto Zatarain Rios, 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. Injection, methylprednisolone acetate, 1 mg (J1010)871 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)343 services
3. 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)81 services
4. Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)56 services
5. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)42 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 cholesterol72%
• Arthritis72%
• Osteoporosis69%
• High blood pressure64%
• Ischemic heart disease23%
• Diabetes22%

Hospitals where Ernesto Zatarain Rios works

Medicare's Facility Affiliation Data lists Ernesto Zatarain Rios 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.

• Peninsula Medical CenterBurlingame, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050007

Practice locations

Addresses where Ernesto Zatarain Rios is enrolled with Medicare (CMS data updated October 2, 2026).

• 123 S San Mateo DrSan Mateo, CA 94401 (650) 343‑4200
• 1501 Trousdale DrBurlingame, CA 94010 (650) 696‑5400
• 1501 Trousdale Dr, Suite 215Burlingame, CA 94010 (415) 600‑6400
• 1720 El Camino RealBurlingame, CA 94010
• 795 El Camino RealPalo Alto, CA 94301 (415) 600‑1020

Group practices

Medicare enrollment lists Ernesto Zatarain Rios as a member of this group (CMS data updated October 2, 2026).

• Sutter Bay Medical Foundation3,829 clinicians in the group

Specialties

• Rheumatologyprimary

Find other Rheumatology doctors in California →

Other rheumatologists in San Mateo

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

• Jennifer Burkham, MD
• Spencer T. Lowe, MD
• Bryan Gescuk
• Michael P. Stevens, MD
• Robert Su, MD
• Lakshmi Myneni, MD
• Paul Shiu, DO
• Katherine Wu, MD

All rheumatologists in San Mateo →

Other clinicians in Sutter Bay Medical Foundation

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

• Katharine N. O'Malley, MD
• Meredith L. Kan, MD
• Poonam Manwani, MD
• Sonya S. Patel, DO
• Robert N. Sinha, MD
• Alison H. Nguyen, 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