Gregory Baker
Internal Medicine Physician · Boston, MA
Gregory Baker is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1255726667, issued on Apr 2, 2015. Check the license (Massachusetts 274252, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Gregory Baker
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 274252 MA
Self-reported in NPPES; status is on the state search - Practice location
- 801 Massachusetts Ave, Boston, MA 02118
- Phone
- (617) 414-7399
- Enumerated
- Apr 2, 2015
- Entity
- Type 1 · individual
Also registered at 801 Massachusetts Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Najla AbdurrahmanInternal Medicine Physician1215478656
- Eftitan Akam, MDPediatrics Physician1568950483
- Marwah AlnewaisAmbulatory Care Pharmacist1932815909
- Margaret Ames, CNPNurse Practitioner1386163178
- Peter ArdenStudent in an Organized Health Care Education/Training Program1821892795
- Nabila Azad, M.D.Internal Medicine Physician1881073138
Verify Gregory 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 274252Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
73% fewer Medicare Part D claims than the average internal medicine physician in 2024
749 Medicare Part D claims for 164 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Metoprolol Succinate112 claims
- Eliquis80 claims
- Atorvastatin Calcium74 claims
- Carvedilol68 claims
- Furosemide42 claims
- Amlodipine Besylate38 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.
The practice group's Medicare quality score for 2023: 83.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $20.59
1 payment, mostly food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals Inc.. The 65,274 providers of this specialty with any payment received $2,536.66 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
2 hospital and facility affiliations
- Cardiology Physicians, LLCNewark, DE
- Christiana Care Health Services IncNewark, DE
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.
3,060 internal medicine physician records list a Boston practice address
They are 3,060 of the 41,865 NPPES records with a Boston practice address, and 7,865 internal medicine physician records in Massachusetts.
All 3,060 in Boston → All 7,865 in Massachusetts → Every provider in Boston →
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 Gregory Baker's NPI number?
Gregory Baker's National Provider Identifier (NPI) is 1255726667, issued on Apr 2, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Baker located?
The NPPES record lists a practice address at 801 Massachusetts Ave, Boston, MA, 02118. Phone: (617) 414-7399. Providers update this record themselves, so call before visiting.
How can I verify Gregory Baker's license?
NPPES lists Massachusetts license number 274252, as entered by the provider. 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 Gregory Baker prescribe under Medicare Part D?
In 2024, Gregory Baker had 749 Medicare Part D claims for 164 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
What is Gregory Baker's Medicare quality score?
The 2023 MIPS final score is 83.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.