Joseph Jay Baker, MD, MPH
Family Medicine Physician · Boston, MA
Joseph Jay Baker, MD, MPH is a family medicine physician with a practice address in Boston, Massachusetts, and NPI 1144338138, issued on Aug 29, 2006. Check the license (Massachusetts 245637, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Joseph Jay Baker
- Credential
- MD, MPH
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 245637 MA
Self-reported in NPPES; status is on the state search - Practice location
- 1340 Boylston St, Boston, MA 02215
- Phone
- (617) 267-0900
- Enumerated
- Aug 29, 2006
- Record last updated
- Apr 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (617) 247-3460
- Medicare enrollment
- Enrolled (PECOS I20110120000833); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 2000
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,265 in Massachusetts → Look up another NPI →
Also registered at 1340 Boylston St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Pamela Adelstein, MDFamily Medicine Physician1306822416
- Emily Aduba, FNP-BCFamily Nurse Practitioner1831617315
- Adam Albano, M.D.Internal Medicine Physician1558689828
- Christopher Alonzo, M.D., MPHInternal Medicine Physician1265812226
- Isabella Anderson, MSWSocial Worker1528701315
- Sophia AxtmanFamily Nurse Practitioner1902452022
Verify Joseph Jay Baker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 245637Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% more Medicare Part D claims than the average family medicine physician in 2024
6,255 Medicare Part D claims for 284 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims. 501 claims were for opioids.
Most prescribed
- Oxycodone Hcl256 claims
- Atorvastatin Calcium237 claims
- Gabapentin222 claims
- Biktarvy192 claims
- Omeprazole146 claims
- Fluticasone Propionate137 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.
Bills Medicare through one group practice
- Fenway Community Health Center, IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph Jay Baker among 2,265 family medicine physician records in Massachusetts
Joseph Jay Baker, MD, MPH is one of 2,265 family medicine physician records with a practice address in Massachusetts. 80% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 55% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2000 · median 2006 among the 1,529 with a school on file
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in Massachusetts
There are 2,265 family medicine physician records in Massachusetts.
All 2,265 in Massachusetts → Every provider in Boston → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Pamela Adelstein, MDBoston, MA 022151306822416
- Ethan Brackett, M.D.Boston, MA 022151912970633
- David Buckle, MDBoston, MA 022151013905108
- Timothy Cavanaugh, M.D.Boston, MA 022151770503831
- Kit Chan, MDBoston, MA 022151528116571
- Jennifer Childs-Roshak, M.D.Boston, MA 022151497780779
- Karen Kelly, M.D.Boston, MA 022151821265729
- Sonia Mathew, MDBoston, MA 022151538249941
Common questions
What is Joseph Jay Baker, MD, MPH's NPI number?
Joseph Jay Baker, MD, MPH's National Provider Identifier (NPI) is 1144338138, issued on Aug 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Jay Baker, MD, MPH located?
The NPPES record lists a practice address at 1340 Boylston St, Boston, MA, 02215. Phone: (617) 267-0900. Providers update this record themselves, so call before visiting.
How can I verify Joseph Jay Baker, MD, MPH's license?
NPPES lists Massachusetts license number 245637, 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 Jay Baker, MD, MPH prescribe under Medicare Part D?
In 2024, Joseph Jay Baker, MD, MPH had 6,255 Medicare Part D claims for 284 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.