Eric I. Marks, M.D.
Medical Oncology Physician · Boston, MA
Eric I. Marks, M.D. is a medical oncology physician with a practice address in Boston, Massachusetts, and NPI 1952729717, issued on Mar 30, 2014. Check the license (Massachusetts 282064, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Eric I. Marks
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 282064 MA
Self-reported in NPPES; status is on the state search - Practice location
- 830 Harrison Ave, 3RD FL, Boston, MA 02118
- Phone
- (617) 638-6428
- Enumerated
- Mar 30, 2014
- Record last updated
- Jun 23, 2023
- Fax
- (617) 638-5756
- Medicaid IDs
- 110160291A MA
3124947 NH - Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 830 Harrison Ave, 3RD FL
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Frances Arters, PA-CPhysician Assistant1700270444
- Tracy Joshi, DNPFamily Nurse Practitioner1629537758
- Adam Lerner, M.D.Medical Oncology Physician1063460087
- Emily Mann, MDInternal Medicine Physician1639638455
- Tashia Prince-Lacombe, NPGerontology Nurse Practitioner1487194833
- Vaishali Sanchorawala, M.D.Hematology (Internal Medicine) Physician1003886573
Verify Eric I. Marks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 282064Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average medical oncology physician in 2024
144 Medicare Part D claims for 28 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 18 claims were for opioids.
Most prescribed
- Dexamethasone33 claims
- Prochlorperazine Maleate32 claims
- Loperamide15 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.
Eric I. Marks among 421 medical oncology physician records in Massachusetts
Eric I. Marks, M.D. 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 2014, is newer than 73% of them.
- NPI issued2014 · 73% of these records are older, 24% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2023 · 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 Eric I. Marks, M.D.'s NPI number?
Eric I. Marks, M.D.'s National Provider Identifier (NPI) is 1952729717, issued on Mar 30, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Eric I. Marks, M.D. located?
The NPPES record lists a practice address at 830 Harrison Ave, 3RD FL, Boston, MA, 02118. Phone: (617) 638-6428. Providers update this record themselves, so call before visiting.
How can I verify Eric I. Marks, M.D.'s license?
NPPES lists Massachusetts license number 282064, 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 Eric I. Marks, M.D. prescribe under Medicare Part D?
In 2024, Eric I. Marks, M.D. had 144 Medicare Part D claims for 28 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.