Brett Diamond, MD
Radiation Oncology Physician · Boston, MA
Brett Diamond, MD is a radiation oncology physician with a practice address in Boston, Massachusetts, and NPI 1619437340, issued on Mar 20, 2019. Check the license (Massachusetts 1017918, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Brett Diamond
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 1017918 MA
Self-reported in NPPES; status is on the state search - Practice location
- 800 Washington St, Boston, MA 02111
- Phone
- (617) 636-6161
- Enumerated
- Mar 20, 2019
- Record last updated
- Jul 3, 2024
- Medicare enrollment
- Enrolled (PECOS I20240624004137); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 241 in Massachusetts → Look up another NPI →
Also registered at 800 Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Aalberg, MD, MPHSurgery Physician1326788027
- Omer Abbak, PHARMDPharmacist1114500337
- Aya Abdelnaser, MDStudent in an Organized Health Care Education/Training Program1770425373
- Marie Elise Abi Antoun, MDObstetrics & Gynecology Physician1356042626
- Ahmad AboalfarajSurgery Physician1538517651
- Tala Abu Samaan, MDStudent in an Organized Health Care Education/Training Program1376386250
Verify Brett Diamond in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 1017918Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average radiation oncology physician in 2024
22 Medicare Part D claims, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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
- Pratt Radiation Oncology Associates IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brett Diamond among 241 radiation oncology physician records in Massachusetts
Brett Diamond, MD is one of 241 radiation oncology physician records with a practice address in Massachusetts. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 87% of them.
- NPI issued2019 · 87% of these records are older, 10% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2019 · median 2006 among the 172 with a school on file
- Record last updated2024 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Massachusetts
There are 241 radiation oncology physician records in Massachusetts.
All 241 in Massachusetts → Every provider in Boston → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Kathryn Huber, M.D., PH.D.Boston, MA 021111922211655
- Seth Kaufman, M.D.Boston, MA 021111245277441
- David Mayhew, M.D.Boston, MA 021111659630978
- John Mignano, M.DBoston, MA 021111477519643
- Matthew ThoonkuzhyBoston, MA 021111407597719
- Theodore Hong, MDBoston, MA 021141457342917
- Ellen Kornmehl, MDBoston, MA 021141740270487
- Norbert Liebsch, MD PHDBoston, MA 021141801887948
Common questions
What is Brett Diamond, MD's NPI number?
Brett Diamond, MD's National Provider Identifier (NPI) is 1619437340, issued on Mar 20, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Brett Diamond, MD located?
The NPPES record lists a practice address at 800 Washington St, Boston, MA, 02111. Phone: (617) 636-6161. Providers update this record themselves, so call before visiting.
How can I verify Brett Diamond, MD's license?
NPPES lists Massachusetts license number 1017918, 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 Brett Diamond, MD prescribe under Medicare Part D?
In 2024, Brett Diamond, MD had 22 Medicare Part D claims; the average among radiation oncology physician prescribers was 134. 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.