Geoffrey R. Oxnard, MD
Medical Oncology Physician · Boston, MA
Geoffrey R. Oxnard, MD is a medical oncology physician with a practice address in Boston, Massachusetts, and NPI 1033300157, issued on Aug 5, 2007. Check the license (Massachusetts 230804, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Geoffrey R. Oxnard
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 230804 MA
Self-reported in NPPES; status is on the state search - Practice location
- 830 Harrison Avenue, 3RD FL, Boston, MA 02118
- Phone
- (617) 638-6428
- Enumerated
- Aug 5, 2007
- Record last updated
- May 20, 2026
- Fax
- (617) 638-5756
- Medicaid IDs
- 110088222A MA
3129357 NH - Medicare enrollment
- Enrolled (PECOS I20110510000510); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 830 Harrison Avenue, 3RD FL
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Hussein Assi, M.DMedical Oncology Physician1235544362
- Britney Bell, MDHematology & Oncology Physician1265938732
- Natasha Burke, N.P.Gerontology Nurse Practitioner1700325503
- Yenong Cao, MDHematology & Oncology Physician1063972016
Verify Geoffrey R. Oxnard in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 230804Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average medical oncology physician in 2024
86 Medicare Part D claims, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims. 14 claims were for opioids.
Most prescribed
- Tagrisso12 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
- Evans Medical Foundation IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geoffrey R. Oxnard among 421 medical oncology physician records in Massachusetts
Geoffrey R. Oxnard, MD 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 49% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2003 · median 2007 among the 291 with a school on file
- 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
- Adeboye Adewoye, M.D.Boston, MA 021181316920838
- Karen Antman, M.D.Boston, MA 021181528195401
- Marjory Charlot, M.D.Boston, MA 021181871609644
- Peter Everett, M.D.Boston, MA 021181144495375
- Amy Fallon, MDBoston, MA 021181346223450
- Gretchen Gignac, MDBoston, MA 021181821288960
- Kevan Hartshorn, M.D.Boston, MA 021181700862745
- Naomi Ko, M.D.Boston, MA 021181043360928
Common questions
What is Geoffrey R. Oxnard, MD's NPI number?
Geoffrey R. Oxnard, MD's National Provider Identifier (NPI) is 1033300157, issued on Aug 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Geoffrey R. Oxnard, MD located?
The NPPES record lists a practice address at 830 Harrison Avenue, 3RD FL, Boston, MA, 02118. Phone: (617) 638-6428. Providers update this record themselves, so call before visiting.
How can I verify Geoffrey R. Oxnard, MD's license?
NPPES lists Massachusetts license number 230804, 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 Geoffrey R. Oxnard, MD prescribe under Medicare Part D?
In 2024, Geoffrey R. Oxnard, MD had 86 Medicare Part D claims; 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.