Jeffrey O. Greenberg, M.D.
Internal Medicine Physician · Watertown, MA
Jeffrey O. Greenberg, M.D. is an internal medicine physician with a practice address in Watertown, Massachusetts, and NPI 1134153885, issued on Jul 10, 2006. Check the license (Massachusetts 227342, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jeffrey O. Greenberg
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 227342 MA
Self-reported in NPPES; status is on the state search - Practice location
- 101 Walnut St, Watertown, MA 02472
- Phone
- (781) 291-3042
- Enumerated
- Jul 10, 2006
- Record last updated
- Nov 4, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (857) 343-8192
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 101 Walnut St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jeffrey O. Greenberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 227342Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
52 Medicare Part D claims, against an average of 3,176 among the 108,855 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: $54.33
3 payments; by number, the most common kind was food and beverage; the largest payer was Scilex Pharmaceuticals Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Jeffrey O. Greenberg among 6,825 internal medicine physician records in Massachusetts
Jeffrey O. Greenberg, 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 fileNo · 60% of these records are
- Record last updated2020 · 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).
28 internal medicine physician records list a practice address in Watertown
They are 28 of the 873 NPPES records with a practice address in Watertown, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Watertown → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mark Bauer, M.D.Watertown, MA 024721487625307
- David Cancian, MDWatertown, MA 024721962496539
- Andrew Cutler, MDWatertown, MA 024721437159720
- Paul Fergus, MDWatertown, MA 024721356336200
- Richard Galgano, D.O.Watertown, MA 024721225003569
- Paul Kasuba, MDWatertown, MA 024721851389969
- Robert Kelleher, MDWatertown, MA 024721891761714
- Joo Kim, M.D.Watertown, MA 024721497724173
Common questions
What is Jeffrey O. Greenberg, M.D.'s NPI number?
Jeffrey O. Greenberg, M.D.'s National Provider Identifier (NPI) is 1134153885, issued on Jul 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey O. Greenberg, M.D. located?
The NPPES record lists a practice address at 101 Walnut St, Watertown, MA, 02472. Phone: (781) 291-3042. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey O. Greenberg, M.D.'s license?
NPPES lists Massachusetts license number 227342, 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 Jeffrey O. Greenberg, M.D. prescribe under Medicare Part D?
In 2024, Jeffrey O. Greenberg, M.D. had 52 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.