John E. Marshall, MD
Rheumatology Physician · Baton Rouge, LA
John E. Marshall, MD is a rheumatology physician with a practice address in Baton Rouge, Louisiana, and NPI 1811918568, issued on Jul 21, 2006. Check the license (Louisiana 12924R, as entered in NPPES) on the Louisiana State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John E. Marshall
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 12924R LA
Self-reported in NPPES; status is on the state search - Practice location
- 7373 Perkins RD, Baton Rouge, LA 70808
- Phone
- (225) 769-4044
- Enumerated
- Jul 21, 2006
- Record last updated
- Feb 4, 2011 (not updated in 15 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 89 in Louisiana → Look up another NPI →
Also registered at 7373 Perkins RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John E. Marshall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersLouisiana State Board of Medical Examiners
Search for license 12924RCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average rheumatology physician in 2024
23 Medicare Part D claims, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D.
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.
John E. Marshall among 89 rheumatology physician records in Louisiana
John E. Marshall, MD is one of 89 rheumatology physician records with a practice address in Louisiana. 88% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 53% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2011 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Louisiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Louisiana
There are 89 rheumatology physician records in Louisiana.
All 89 in Louisiana → Every provider in Baton Rouge → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Randall Beyl, MDBaton Rouge, LA 708081356630958
- Angele Bourg, M.D.Baton Rouge, LA 708081083655237
- Ronald Ceruti, MDBaton Rouge, LA 708081316972110
- Elena Cucurull, MDBaton Rouge, LA 708081225061716
- Bobby Dupre, M.D.Baton Rouge, LA 708081164612479
- Jen Erbil, M.D.Baton Rouge, LA 708081558595256
- Harmanjot Grewal, M.D.Baton Rouge, LA 708081396904090
- Khanh Ho, M.D.Baton Rouge, LA 708081144253709
Common questions
What is John E. Marshall, MD's NPI number?
John E. Marshall, MD's National Provider Identifier (NPI) is 1811918568, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John E. Marshall, MD located?
The NPPES record lists a practice address at 7373 Perkins RD, Baton Rouge, LA, 70808. Phone: (225) 769-4044. Providers update this record themselves, so call before visiting.
How can I verify John E. Marshall, MD's license?
NPPES lists Louisiana license number 12924R, as entered by the provider. Search the Louisiana State Board of Medical Examiners at https://www.lsbme.la.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John E. Marshall, MD prescribe under Medicare Part D?
In 2024, John E. Marshall, MD had 23 Medicare Part D claims; the average among rheumatology physician prescribers was 1,978. 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.