Mayssam El Najjar
Internal Medicine Physician · Boston, MA
Mayssam El Najjar is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1821764622, issued on Aug 20, 2021. Check the license (Massachusetts 289754, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mayssam El Najjar
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 289754 MA
Self-reported in NPPES; status is on the state search - Practice location
- 736 Cambridge St, Boston, MA 02135
- Phone
- (617) 789-3000
- Enumerated
- Aug 20, 2021
- Record last updated
- Jun 25, 2025
- Medicaid ID
- 236 MA
- Entity
- Type 1 · individual
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Verify Mayssam El Najjar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 289754Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
116 Medicare Part D claims for 34 beneficiaries, 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.
Mayssam El Najjar among 6,825 internal medicine physician records in Massachusetts
Mayssam El Najjar 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 2021, is newer than 89% of them.
- NPI issued2021 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2025 · 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).
2,320 internal medicine physician records list a practice address in Boston
They are 2,320 of the 41,865 NPPES records with a practice address in Boston, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Sheila Macdonnell, M.D.Brighton, MA 021351245227958
- Ida Minevich, MDBrighton, MA 021351891780367
Common questions
What is Mayssam El Najjar's NPI number?
Mayssam El Najjar's National Provider Identifier (NPI) is 1821764622, issued on Aug 20, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mayssam El Najjar located?
The NPPES record lists a practice address at 736 Cambridge St, Boston, MA, 02135. Phone: (617) 789-3000. Providers update this record themselves, so call before visiting.
How can I verify Mayssam El Najjar's license?
NPPES lists Massachusetts license number 289754, 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 Mayssam El Najjar prescribe under Medicare Part D?
In 2024, Mayssam El Najjar had 116 Medicare Part D claims for 34 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.