Joseph Marcel-Saint-Louis Demertine, M.D.
Internal Medicine Physician · Boston, MA
Joseph Marcel-Saint-Louis Demertine, M.D. is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1427007822, issued on May 10, 2006. Check the license (Massachusetts 76898, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Joseph Marcel-Saint-Louis Demertine
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 76898 MA
233842 NY
Self-reported in NPPES; status is on the state search - Practice location
- 581 Boylston St, Boston, MA 02116
- Phone
- (617) 247-1400
- Enumerated
- May 10, 2006
- Record last updated
- Feb 22, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (617) 247-1411
- Medicaid ID
- 3203808 MA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 581 Boylston St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joseph Marcel-Saint-Louis Demertine in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 76898Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
395 Medicare Part D claims for 88 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Ibuprofen25 claims
- Clotrimazole-Betamethasone24 claims
- Lisinopril17 claims
- Atorvastatin Calcium16 claims
- Metformin Hcl14 claims
- Amoxicillin-Clavulanate Potass13 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.
Joseph Marcel-Saint-Louis Demertine among 6,825 internal medicine physician records in Massachusetts
Joseph Marcel-Saint-Louis Demertine, 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 updated2017 · 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
- James Bonanno, MDBoston, MA 021161760461115
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- Moira Cunningham, M.D.Boston, MA 021161437120995
- Federico Erebia, M.D.Boston, MA 021161588639744
- Monica Gomez, MDBoston, MA 021161174585368
- Yun Lam, M.D.Boston, MA 021161134100894
- Katherine Lantsman, M.D.Boston, MA 021161720052475
- Frederick LeeBoston, MA 021161295710473
Common questions
What is Joseph Marcel-Saint-Louis Demertine, M.D.'s NPI number?
Joseph Marcel-Saint-Louis Demertine, M.D.'s National Provider Identifier (NPI) is 1427007822, issued on May 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Marcel-Saint-Louis Demertine, M.D. located?
The NPPES record lists a practice address at 581 Boylston St, Boston, MA, 02116. Phone: (617) 247-1400. Providers update this record themselves, so call before visiting.
How can I verify Joseph Marcel-Saint-Louis Demertine, M.D.'s license?
NPPES lists Massachusetts license number 76898, 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 Joseph Marcel-Saint-Louis Demertine, M.D. prescribe under Medicare Part D?
In 2024, Joseph Marcel-Saint-Louis Demertine, M.D. had 395 Medicare Part D claims for 88 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.