Bruce M. Ewenstein, M.D.
Internal Medicine Physician · Brookline, MA
Bruce M. Ewenstein, M.D. is an internal medicine physician with a practice address in Brookline, Massachusetts, and NPI 1538202007, issued on Feb 15, 2007. Check the license (Massachusetts 52653, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Bruce M. Ewenstein
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 52653 MA
Self-reported in NPPES; status is on the state search - Practice location
- 15 Claflin Path, Brookline, MA 02445
- Phone
- (617) 731-9211
- Enumerated
- Feb 15, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Verify Bruce M. Ewenstein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 52653Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
16 Medicare Part D claims, against an average of 3,176 among the 108,855 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.
Bruce M. Ewenstein among 6,825 internal medicine physician records in Massachusetts
Bruce M. Ewenstein, 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 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2007 · 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).
57 internal medicine physician records list a practice address in Brookline
They are 57 of the 2,357 NPPES records with a practice address in Brookline, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Brookline → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rebecca Ashkenazy, M.D.Brookline, MA 024451619934403
- Ali Bahadori, MDBrookline, MA 024451376592584
- David Mark Davidson, M.D.Brookline, MA 024451457399677
- Kurt Fabrick, M.D., M.P.H.Brookline, MA 024451538113477
- Ronald Katz, M.D.Brookline, MA 024451508834011
- Christine Keegan, MDBrookline, MA 024451952364143
- Robin Mayfield, M.D.Brookline, MA 024451225098924
- Rattna Phull, MDBrookline, MA 024451629035928
Common questions
What is Bruce M. Ewenstein, M.D.'s NPI number?
Bruce M. Ewenstein, M.D.'s National Provider Identifier (NPI) is 1538202007, issued on Feb 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Bruce M. Ewenstein, M.D. located?
The NPPES record lists a practice address at 15 Claflin Path, Brookline, MA, 02445. Phone: (617) 731-9211. Providers update this record themselves, so call before visiting.
How can I verify Bruce M. Ewenstein, M.D.'s license?
NPPES lists Massachusetts license number 52653, 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 Bruce M. Ewenstein, M.D. prescribe under Medicare Part D?
In 2024, Bruce M. Ewenstein, M.D. had 16 Medicare Part D claims; 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.