Othon Iliopoulos, MD
Medical Oncology Physician · Boston, MA
Othon Iliopoulos, MD is a medical oncology physician with a practice address in Boston, Massachusetts, and NPI 1447352448, issued on Sep 1, 2006. Check the license (Massachusetts 76267, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Othon Iliopoulos
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 76267 MA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Blossom Street, Boston, MA 02114
- Phone
- (617) 724-3404
- Enumerated
- Sep 1, 2006
- Record last updated
- Dec 18, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (617) 726-8623
- Medicaid ID
- 0117749 MA
- Medicare enrollment
- Enrolled (PECOS I20040608000437); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 100 Blossom Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Steven McAfee, MDMedical Oncology Physician1588647945
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Verify Othon Iliopoulos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 76267Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average medical oncology physician in 2024
21 Medicare Part D claims, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $18.09
1 payment: education; the largest payer was Merck Sharp & Dohme LLC. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Othon Iliopoulos among 421 medical oncology physician records in Massachusetts
Othon Iliopoulos, 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1985 · median 2007 among the 291 with a school on file
- Record last updated2012 · 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 Othon Iliopoulos, MD's NPI number?
Othon Iliopoulos, MD's National Provider Identifier (NPI) is 1447352448, issued on Sep 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Othon Iliopoulos, MD located?
The NPPES record lists a practice address at 100 Blossom Street, Boston, MA, 02114. Phone: (617) 724-3404. Providers update this record themselves, so call before visiting.
How can I verify Othon Iliopoulos, MD's license?
NPPES lists Massachusetts license number 76267, 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 Othon Iliopoulos, MD prescribe under Medicare Part D?
In 2024, Othon Iliopoulos, MD had 21 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.