Mary Barker, M.D.
Internal Medicine Physician · Wellesley, MA
Mary Barker, M.D. is an internal medicine physician with a practice address in Wellesley, Massachusetts, and NPI 1215908132, issued on Jan 30, 2006. Check the license on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mary Barker
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 230 Worcester St, Wellesley, MA 02481
- Phone
- (781) 431-5220
- Enumerated
- Jan 30, 2006
- Entity
- Type 1 · individual
Also registered at 230 Worcester St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Susan Adamson, NPNurse Practitioner1316916604
- Dea Angiolillo, M.D.Internal Medicine Physician1649241985
- Eukeria Asamoah, PMHNPPsychiatry Physician1801596341
- Christine Baker, LMHCMental Health Counselor1992120893
- Kalina Bergmann, PA-CInternal Medicine Physician1083549661
- Judy Berk, CNMMidwife1265522056
Verify Mary Barker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
2.8 times the Medicare Part D claims of the average internal medicine physician in 2024
7,686 Medicare Part D claims for 677 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 130 claims were for opioids.
Most prescribed
- Atorvastatin Calcium734 claims
- Losartan Potassium403 claims
- Levothyroxine Sodium396 claims
- Amlodipine Besylate329 claims
- Lisinopril275 claims
- Simvastatin250 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.
One hospital or facility affiliation
- Atrius Health IncDedham, MA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
79 internal medicine physician records list a Wellesley practice address
They are 79 of the 1,117 NPPES records with a Wellesley practice address, and 7,865 internal medicine physician records in Massachusetts.
All 79 in Wellesley → All 7,865 in Massachusetts → Every provider in Wellesley →
Other internal medicine physician records in Massachusetts
- Nawal Aamir, MDWorcester, MA1588248926
- Zainab AbbasWorcester, MA1609028000
- Nooshin Abbasi, MD MPHNewton, MA1831888353
- Lauren Abbate, MDBoston, MA1922099621
- Bassima Abdallah, MDBoston, MA1912327305
- Samah Abdallah, MDBrighton, MA1730814971
- Omar Abdel-Wahab, M.D.Boston, MA1023042777
- Salah Abdelgadir, MDBoston, MA1891280954
- Mahmoud Abdelghany, M.D.Springfield, MA1134479629
- Mohab AbdelhalimBoston, MA1871388496
Common questions
What is Mary Barker, M.D.'s NPI number?
Mary Barker, M.D.'s National Provider Identifier (NPI) is 1215908132, issued on Jan 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Barker, M.D. located?
The NPPES record lists a practice address at 230 Worcester St, Wellesley, MA, 02481. Phone: (781) 431-5220. Providers update this record themselves, so call before visiting.
How can I verify Mary Barker, M.D.'s license?
Search the Massachusetts Board of Registration in Medicine at https://www.mass.gov/orgs/board-of-registration-in-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Barker, M.D. prescribe under Medicare Part D?
In 2024, Mary Barker, M.D. had 7,686 Medicare Part D claims for 677 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.