James Michael Bartz, MD
Internal Medicine Physician · Boston, MA
James Michael Bartz, MD is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1801917372, issued on Apr 3, 2007. Check the license (Massachusetts 234624, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- James Michael Bartz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 234624 MA
L-224875 MA
Self-reported in NPPES; status is on the state search - Practice location
- Massachusetts General Hospital, Boston, MA 02114
- Phone
- (617) 726-2066
- Enumerated
- Apr 3, 2007
- Record last updated
- Dec 9, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080807000402); accepts Medicare assignment
- Medical or professional school
- Emory University School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at Massachusetts General Hospital
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Michael Bartz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 234624Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
154 Medicare Part D claims for 36 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Eliquis23 claims
- Atorvastatin Calcium15 claims
- Metoprolol Succinate14 claims
- Escitalopram Oxalate11 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
- Mass General Brigham Medical Group Suburban Massachusetts IncNewton, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Michael Bartz among 6,825 internal medicine physician records in Massachusetts
James Michael Bartz, MD 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 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2005 · median 2004 among the 4,103 with a school on file
- Record last updated2009 · 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
- Jaime Chang, MDBoston, MA 021141205825197
- Jeffrey Engelman, MD PHDBoston, MA 021141538159108
- James Evans, MDBoston, MA 021141215939533
- Nicolette Fontaine, MDBoston, MA 021141841287174
- Nancy Gagliano, MDBoston, MA 021141881680767
- Patricia Gibbons, MDBoston, MA 021141619967221
- Steven Hersch, MDBoston, MA 021141174512149
- Mira Kautzky, M.D.Boston, MA 021141972505402
Common questions
What is James Michael Bartz, MD's NPI number?
James Michael Bartz, MD's National Provider Identifier (NPI) is 1801917372, issued on Apr 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is James Michael Bartz, MD located?
The NPPES record lists a practice address at Massachusetts General Hospital, Boston, MA, 02114. Phone: (617) 726-2066. Providers update this record themselves, so call before visiting.
How can I verify James Michael Bartz, MD's license?
NPPES lists Massachusetts license number 234624, 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 James Michael Bartz, MD prescribe under Medicare Part D?
In 2024, James Michael Bartz, MD had 154 Medicare Part D claims for 36 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.