Benjamin S. Chen, M.D.
Internal Medicine Physician · Oakland, CA
Benjamin S. Chen, M.D. is an internal medicine physician with a practice address in Oakland, California, and NPI 1760744874, issued on Jun 14, 2012. Check the license (California A 121497, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Benjamin S. Chen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A 121497 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1030 International Blvd, Oakland, CA 94606
- Phone
- (510) 238-5400
- Enumerated
- Jun 14, 2012
- Record last updated
- Feb 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20150518000475); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1030 International Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Clarisa Anguiano-RoblesCounselor1548774003
- Douglas Beazley, NPNurse Practitioner1386941029
- Leah Bushman, NPAdult Health Nurse Practitioner1871873869
- Mary Beth Canavan, CNMAdvanced Practice Midwife1326148677
- Evelyn Carson, PA-CMedical Physician Assistant1386222156
- Wendy Casasola, LVNLicensed Vocational Nurse1538302989
Verify Benjamin S. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A 121497Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average internal medicine physician in 2024
3,769 Medicare Part D claims for 294 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 108 claims were for opioids.
Most prescribed
- Atorvastatin Calcium270 claims
- Amlodipine Besylate201 claims
- Metformin Hcl156 claims
- Lisinopril119 claims
- Gabapentin103 claims
- Jardiance100 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 2 group practices
- LA Clinica DE LA Raza IncOakland, CA
- Permanente Medical Group IncOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Benjamin S. Chen among 17,696 internal medicine physician records in California
Benjamin S. Chen, M.D. 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 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2010 · median 2004 among the 11,065 with a school on file
- Record last updated2022 · 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
- Yin Aye, MDOakland, CA 946061548447675
- Benjamin Beers, M.D.Oakland, CA 946061356502660
- Christopher John Co, M.DOakland, CA 946061679704969
- Bay Dang-Vu, MDOakland, CA 946061376575639
- Robert Davis, MDOakland, CA 946061881772952
- Dipankar Ghosh, DOOakland, CA 946061508020009
- Bill Longwell, MDOakland, CA 946061821169475
- Mychi Nguyen, M.D.Oakland, CA 946061366615163
Common questions
What is Benjamin S. Chen, M.D.'s NPI number?
Benjamin S. Chen, M.D.'s National Provider Identifier (NPI) is 1760744874, issued on Jun 14, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Benjamin S. Chen, M.D. located?
The NPPES record lists a practice address at 1030 International Blvd, Oakland, CA, 94606. Phone: (510) 238-5400. Providers update this record themselves, so call before visiting.
How can I verify Benjamin S. Chen, M.D.'s license?
NPPES lists California license number A 121497, 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 Benjamin S. Chen, M.D. prescribe under Medicare Part D?
In 2024, Benjamin S. Chen, M.D. had 3,769 Medicare Part D claims for 294 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.