Zaina El-Isa, MD
Internal Medicine Physician · Oakland, CA
Zaina El-Isa, MD is an internal medicine physician with a practice address in Oakland, California, and NPI 1861623555, issued on Jul 29, 2009. Check the license (California A131838, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Zaina El-Isa
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A131838 CA
4301094067 MI
Self-reported in NPPES; status is on the state search - Practice location
- 2950 International Blvd, Oakland, CA 94601
- Phone
- (510) 535-4410
- Enumerated
- Jul 29, 2009
- Record last updated
- Dec 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150120000022); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2950 International Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Paul Acosta, RDADental Assistant1932529658
- Karina Alcala BarbosaDentist1831608876
- Sandy AlegriaCase Manager/Care Coordinator1285220228
- Christopher Balkissoon, DNP, MSN, FNP-CFamily Nurse Practitioner1598159410
- Dipti Barot, M.D.General Practice Physician1689972184
- Jennifer BarreraFamily Nurse Practitioner1730876822
Verify Zaina El-Isa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A131838Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average internal medicine physician in 2024
461 Medicare Part D claims for 135 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Fosfomycin Tromethamine57 claims
- Amoxicillin34 claims
- Cephalexin34 claims
- Doxycycline Monohydrate27 claims
- Itraconazole20 claims
- Cefadroxil17 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
- Permanente Medical Group IncSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zaina El-Isa among 17,696 internal medicine physician records in California
Zaina El-Isa, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2006 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
432 internal medicine physician records list a practice address in Oakland
They are 432 of the 18,558 NPPES records with a practice address in Oakland, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oakland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Claire Horton, MDOakland, CA 946011649374109
- Astha Kanani, M.D.Oakland, CA 946011770880163
- Bhrett Lash, MDOakland, CA 946011568489383
- Esteban Lovato, M.D.Oakland, CA 946011376610923
- Joseph Marquis, MDOakland, CA 946011598084329
- John Murphy, M.D.Oakland, CA 946011437119591
- Bruce O'Neil, M.D.Oakland, CA 946011255399580
- Mark Robb, MDOakland, CA 946011053499665
Common questions
What is Zaina El-Isa, MD's NPI number?
Zaina El-Isa, MD's National Provider Identifier (NPI) is 1861623555, issued on Jul 29, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Zaina El-Isa, MD located?
The NPPES record lists a practice address at 2950 International Blvd, Oakland, CA, 94601. Phone: (510) 535-4410. Providers update this record themselves, so call before visiting.
How can I verify Zaina El-Isa, MD's license?
NPPES lists California license number A131838, 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 Zaina El-Isa, MD prescribe under Medicare Part D?
In 2024, Zaina El-Isa, MD had 461 Medicare Part D claims for 135 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.