Ernesto Zatarain-Rios, MD
Rheumatology Physician · Burlingame, CA
Ernesto Zatarain-Rios, MD is a rheumatology physician with a practice address in Burlingame, California, and NPI 1487720439, issued on Nov 28, 2006. Check the license (California A46442, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ernesto Zatarain-Rios
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- A46442 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1501 Trousdale Dr, Burlingame, CA 94010
- Phone
- (650) 652-8500
- Enumerated
- Nov 28, 2006
- Record last updated
- Mar 9, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200423000413); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 1501 Trousdale Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ernesto Zatarain-Rios in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A46442Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% fewer Medicare Part D claims than the average rheumatology physician in 2024
1,412 Medicare Part D claims for 238 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. 49 claims were for opioids.
Most prescribed
- Hydroxychloroquine Sulfate227 claims
- Prednisone158 claims
- Methotrexate131 claims
- Alendronate Sodium127 claims
- Humira(Cf) Pen98 claims
- Celecoxib78 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationSan Mateo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ernesto Zatarain-Rios among 926 rheumatology physician records in California
Ernesto Zatarain-Rios, MD is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1978 · median 2003 among the 641 with a school on file
- Record last updated2020 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Burlingame → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Herbert Fisher, M.D.Burlingame, CA 940101194829127
- Spencer Lowe, M.D.Burlingame, CA 940101134213572
- Zi Ying Li, M.DDaly City, CA 940151588160550
- Amy Elliott, MDLos Altos, CA 940221124243092
- Thomas Okarma, PH.D., M.D.Menlo Park, CA 940251972761492
- Cathy Riker, MDMenlo Park, CA 940251255448189
- Vibeke Strand, M.D.Portola Valley, CA 940281194882753
- Jeffrey Brown, MDMountain View, CA 940401750477758
Common questions
What is Ernesto Zatarain-Rios, MD's NPI number?
Ernesto Zatarain-Rios, MD's National Provider Identifier (NPI) is 1487720439, issued on Nov 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ernesto Zatarain-Rios, MD located?
The NPPES record lists a practice address at 1501 Trousdale Dr, Burlingame, CA, 94010. Phone: (650) 652-8500. Providers update this record themselves, so call before visiting.
How can I verify Ernesto Zatarain-Rios, MD's license?
NPPES lists California license number A46442, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ernesto Zatarain-Rios, MD prescribe under Medicare Part D?
In 2024, Ernesto Zatarain-Rios, MD had 1,412 Medicare Part D claims for 238 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.