Eric N. Diamond, M.D.
Internal Medicine Physician · Westwood, MA
Eric N. Diamond, M.D. is an internal medicine physician with a practice address in Westwood, Massachusetts, and NPI 1285607861, issued on Feb 13, 2006. Check the license (Massachusetts 54336, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Eric N. Diamond
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 54336 MA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Brigham Way, Westwood, MA 02090
- Phone
- (781) 471-2200
- Enumerated
- Feb 13, 2006
- Record last updated
- Nov 5, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicaid ID
- 3188507 MA
- Medicare enrollment
- Enrolled (PECOS I20050404000009); accepts Medicare assignment
- Medical or professional school
- Rowan University School Of Osteopathic Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 100 Brigham Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katharine Berthiaume, CNPPrimary Care Nurse Practitioner1518694355
- Emily Brown, FNP-BCFamily Nurse Practitioner1467921064
- Samantha Oslowski, MSN, RN, AGNPPrimary Care Nurse Practitioner1174412506
- Christine Wood, NPAdult Health Nurse Practitioner1720455934
Verify Eric N. 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 54336Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% more Medicare Part D claims than the average internal medicine physician in 2024
5,432 Medicare Part D claims for 500 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 82 claims were for opioids.
Most prescribed
- Atorvastatin Calcium566 claims
- Amlodipine Besylate393 claims
- Lisinopril299 claims
- Hydrochlorothiazide275 claims
- Rosuvastatin Calcium227 claims
- Losartan Potassium212 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
- Mass General Brigham Community Physicians IncWestwood, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eric N. Diamond among 6,825 internal medicine physician records in Massachusetts
Eric N. Diamond, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1983 · median 2004 among the 4,103 with a school on file
- Record last updated2018 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Westwood
They are 3 of the 521 NPPES records with a practice address in Westwood, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Westwood → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles McInnis, M.D.Westwood, MA 020901346343969
- Donna Michelson, MDWestwood, MA 020901194712729
- Deepthi Desilva, MDWrentham, MA 020931184682759
- Iqubal Dhaliwal, M.D.Wrentham, MA 020931770694556
- Neal Friedman, MDWrentham, MA 020931194712257
- Marc Manigat, M.D.Wrentham, MA 020931629028659
- Donald Gedarovich, MDWalpole, MA 020811194811505
- Robert Kelliher, MDWalpole, MA 020811962495010
Common questions
What is Eric N. Diamond, M.D.'s NPI number?
Eric N. Diamond, M.D.'s National Provider Identifier (NPI) is 1285607861, issued on Feb 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Eric N. Diamond, M.D. located?
The NPPES record lists a practice address at 100 Brigham Way, Westwood, MA, 02090. Phone: (781) 471-2200. Providers update this record themselves, so call before visiting.
How can I verify Eric N. Diamond, M.D.'s license?
NPPES lists Massachusetts license number 54336, 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 N. Diamond, M.D. prescribe under Medicare Part D?
In 2024, Eric N. Diamond, M.D. had 5,432 Medicare Part D claims for 500 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.