NPPES file of Aug 9, 2026

Mazen Jamil El-Sayed, MD

Emergency Medical Services (Emergency Medicine) Physician · Boston, MA

Mazen Jamil El-Sayed, MD is an emergency medical services (emergency medicine) physician with a practice address in Boston, Massachusetts, and NPI 1790820504, issued on Feb 20, 2007. Check the license (Massachusetts 239542, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1790820504
Name
Mazen Jamil El-Sayed
Credential
MD
Primary taxonomy
Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
License number
239542 MA
Self-reported in NPPES; status is on the state search
Practice location
1 Boston Medical Ctr PL, Boston, MA 02118
Phone
(617) 638-8000
Enumerated
Feb 20, 2007
Record last updated
Jan 31, 2011 (not updated in 15 years: call before relying on the address or phone)
Medicaid ID
110083543A MA
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest emergency medical services (emergency medicine) physician records → All 43 in Massachusetts → Look up another NPI →

Also registered at 1 Boston Medical Ctr PL

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Rachel Achu-Lopes, M.D.Anesthesiology Physician1417376872
  2. Sapana Adhikari, M.D.Emergency Medicine Physician1902870694
  3. Tara AdyanthayaMental Health Counselor1053998419
  4. Shuchi AgarwalStudent in an Organized Health Care Education/Training Program1063701753
  5. Christina AgudeloStudent in an Organized Health Care Education/Training Program1699423772
  6. Priscilla AguilarStudent in an Organized Health Care Education/Training Program1033838792

Verify Mazen Jamil El-Sayed in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
    Search for license 239542    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Massachusetts license search

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Mazen Jamil El-Sayed among 43 emergency medical services (emergency medicine) physician records in Massachusetts

Mazen Jamil El-Sayed, MD is one of 43 emergency medical services (emergency medicine) physician records with a practice address in Massachusetts. 53% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 63% of them.

  • NPI issued2007 · 63% of these records are older, 28% newer
  • In a Medicare fileNo · 53% of these records are
  • In the CMS Doctors and Clinicians fileNo · 49% of these records are
  • Record last updated2011 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Emergency Medical Services (Emergency Medicine) Physician providers in Massachusetts

There are 43 emergency medical services (emergency medicine) physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 43 in Massachusetts → Every provider in Boston → Emergency Medical Services (Emergency Medicine) Physician nationwide →

The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes

  1. Lori Harrington, MDBoston, MA 021181295781037
  2. Eric Nilles, MDBoston, MA 021151124007109
  3. Isabel Algaze-Gonzalez, M.D.Boston, MA 021141285999060
  4. Irving Danesh, M.D.East Boston, MA 021281922083278
  5. Michael Brockman, DOWest Roxbury, MA 021321902549801
  6. Keiran Warner, M.D.West Roxbury, MA 021321104280189
  7. Edward Oneil, MDBrighton, MA 021351982807434
  8. Cheri Weaver, MDQuincy, MA 021691073763090

Common questions

What is Mazen Jamil El-Sayed, MD's NPI number?

Mazen Jamil El-Sayed, MD's National Provider Identifier (NPI) is 1790820504, issued on Feb 20, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Mazen Jamil El-Sayed, MD located?

The NPPES record lists a practice address at 1 Boston Medical Ctr PL, Boston, MA, 02118. Phone: (617) 638-8000. Providers update this record themselves, so call before visiting.

How can I verify Mazen Jamil El-Sayed, MD's license?

NPPES lists Massachusetts license number 239542, 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.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.