Gerin F. River, MD
Emergency Medicine Physician · Oakland, CA
Gerin F. River, MD is an emergency medicine physician with a practice address in Oakland, California, and NPI 1831408921, issued on Oct 7, 2010. Check the license (California A116048, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gerin F. River
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A116048 CA
Self-reported in NPPES; status is on the state search - Practice location
- 275 W Macarthur, Oakland, CA 94611
- Phone
- (510) 752-1000
- Enumerated
- Oct 7, 2010
- Record last updated
- Jan 21, 2022
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 275 W Macarthur
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gerin F. River in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A116048Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average emergency medicine physician in 2024
75 Medicare Part D claims for 57 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Dexamethasone14 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.
Gerin F. River among 7,751 emergency medicine physician records in California
Gerin F. River, MD is one of 7,751 emergency medicine 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 2010, is newer than 58% of them.
- NPI issued2010 · 58% of these records are older, 40% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
247 emergency medicine physician records list a practice address in Oakland
They are 247 of the 18,558 NPPES records with a practice address in Oakland, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Oakland → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- David Doostan, MDOakland, CA 946111174564819
- Mark GoldinOakland, CA 946111205834751
- Anjali Gupta, MDOakland, CA 946111902837719
- Jennifer Harris, MDOakland, CA 946111003912015
- Herbert Hern, MDOakland, CA 946111154303121
- Jennifer Johnson, MDOakland, CA 946111912001157
- Zeenat Khan, MDOakland, CA 946111417048307
- Odile Leland-Arizmendi, M.D.Oakland, CA 946111548361926
Common questions
What is Gerin F. River, MD's NPI number?
Gerin F. River, MD's National Provider Identifier (NPI) is 1831408921, issued on Oct 7, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Gerin F. River, MD located?
The NPPES record lists a practice address at 275 W Macarthur, Oakland, CA, 94611. Phone: (510) 752-1000. Providers update this record themselves, so call before visiting.
How can I verify Gerin F. River, MD's license?
NPPES lists California license number A116048, 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 Gerin F. River, MD prescribe under Medicare Part D?
In 2024, Gerin F. River, MD had 75 Medicare Part D claims for 57 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.