Margaret Mary Hayes, MD
Critical Care Medicine (Internal Medicine) Physician · Boston, MA
Margaret Mary Hayes, MD is a critical care medicine (internal medicine) physician with a practice address in Boston, Massachusetts, and NPI 1659545960, issued on Apr 17, 2008. Check the license (Massachusetts 263393, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Margaret Mary Hayes
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- 263393 MA
Self-reported in NPPES; status is on the state search - Practice location
- 330 Brookline Ave, Boston, MA 02215
- Phone
- (617) 667-5864
- Enumerated
- Apr 17, 2008
- Record last updated
- Aug 24, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (617) 667-4849
- Medicaid ID
- 056121500 MD
- Medicare enrollment
- Enrolled (PECOS I20150918002005); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 157 in Massachusetts → Look up another NPI →
Also registered at 330 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Margaret Mary Hayes in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 263393Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Harvard Medical Faculty Phys AT Beth Israel Deaconess Med Ctr IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Mary Hayes among 157 critical care medicine (internal medicine) physician records in Massachusetts
Margaret Mary Hayes, MD is one of 157 critical care medicine (internal medicine) physician records with a practice address in Massachusetts. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 52% of them.
- NPI issued2008 · 52% of these records are older, 40% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2008 · median 2005 among the 116 with a school on file
- Record last updated2016 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in Massachusetts
There are 157 critical care medicine (internal medicine) physician records in Massachusetts.
All 157 in Massachusetts → Every provider in Boston → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Elias Baedorf Kassis, M.D.Boston, MA 022151225358799
- Leo Celi, M.D. M.P.H. M.S.Boston, MA 022151629257878
- Michael Cho, MDBoston, MA 022151750363990
- Peter Clardy, M.D.Boston, MA 022151629000237
- David Delaney, M.D.Boston, MA 022151194760819
- Michael Donnino, MDBoston, MA 022151174624357
- Angela Frank, M.D.Boston, MA 022151720176654
- Debby Ngo, M.D.Boston, MA 022151295981009
Common questions
What is Margaret Mary Hayes, MD's NPI number?
Margaret Mary Hayes, MD's National Provider Identifier (NPI) is 1659545960, issued on Apr 17, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Mary Hayes, MD located?
The NPPES record lists a practice address at 330 Brookline Ave, Boston, MA, 02215. Phone: (617) 667-5864. Providers update this record themselves, so call before visiting.
How can I verify Margaret Mary Hayes, MD's license?
NPPES lists Massachusetts license number 263393, 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. 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.