Ben Ouyang
Medical Oncology Physician · Boston, MA
Ben Ouyang is a medical oncology physician with a practice address in Boston, Massachusetts, and NPI 1356091896, issued on Mar 27, 2022. Check the license (Massachusetts 293679, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Ben Ouyang
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 293679 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (617) 726-5820
- Enumerated
- Mar 27, 2022
- Record last updated
- May 14, 2026
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Moustafa AbdallaStudent in an Organized Health Care Education/Training Program1952046062
- Shadi Abdar Esfahani, MD, MPHDiagnostic Radiology Physician1497137590
Verify Ben Ouyang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 293679Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% fewer Medicare Part D claims than the average medical oncology physician in 2024
280 Medicare Part D claims for 41 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Naproxen18 claims
- Np Thyroid13 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.
Ben Ouyang among 421 medical oncology physician records in Massachusetts
Ben Ouyang is one of 421 medical oncology physician records with a practice address in Massachusetts. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 98% of them.
- NPI issued2022 · 98% of these records are older, 1% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2026 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Massachusetts
There are 421 medical oncology physician records in Massachusetts.
All 421 in Massachusetts → Every provider in Boston → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Eyal Attar, MDBoston, MA 021141407847965
- Lawrence Blaszkowsky, MDBoston, MA 021141225028137
- Leif Ellisen, MD PHDBoston, MA 021141225028533
- Rajesh Gandhi, MDBoston, MA 021141992795512
- Ephraim Hochberg, MDBoston, MA 021141326038407
- Richard Lee, MD PHDBoston, MA 021141871583096
- Geoffrey Liu, MDBoston, MA 021141215928452
- Marc Michaelson, MD PHDBoston, MA 021141275523490
Common questions
What is Ben Ouyang's NPI number?
Ben Ouyang's National Provider Identifier (NPI) is 1356091896, issued on Mar 27, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Ben Ouyang located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (617) 726-5820. Providers update this record themselves, so call before visiting.
How can I verify Ben Ouyang's license?
NPPES lists Massachusetts license number 293679, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ben Ouyang prescribe under Medicare Part D?
In 2024, Ben Ouyang had 280 Medicare Part D claims for 41 beneficiaries; the average among medical oncology physician prescribers was 703. 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.