John Derrick Marker, M.D.
Hospitalist Physician · New Orleans, LA
John Derrick Marker, M.D. is a hospitalist physician with a practice address in New Orleans, Louisiana, and NPI 1942477583, issued on May 13, 2008. Check the license (Louisiana MD.204045, as entered in NPPES) on the Louisiana State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John Derrick Marker
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- MD.204045 LA
MD204045 LA
Self-reported in NPPES; status is on the state search - Practice location
- 1430 Tulane Ave SL 50, New Orleans, LA 70112
- Phone
- (504) 988-7809
- Enumerated
- May 13, 2008
- Record last updated
- Apr 3, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (504) 988-3971
- Medicare enrollment
- Enrolled (PECOS I20110811000558); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 340 in Louisiana → Look up another NPI →
Also registered at 1430 Tulane Ave SL 50
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Henry Hefler, MDGastroenterology Physician1053588699
Verify John Derrick Marker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersLouisiana State Board of Medical Examiners
Search for license MD.204045Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% more Medicare Part D claims than the average hospitalist physician in 2024
555 Medicare Part D claims for 165 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 18 claims were for opioids.
Most prescribed
- Nifedipine Er30 claims
- Pantoprazole Sodium28 claims
- Carvedilol27 claims
- Furosemide24 claims
- Prednisone22 claims
- Losartan Potassium17 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
- Belle Chasse Physician Services LLCNew Orleans, LA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Derrick Marker among 340 hospitalist physician records in Louisiana
John Derrick Marker, M.D. is one of 340 hospitalist physician records with a practice address in Louisiana. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 23% of them.
- NPI issued2008 · 23% of these records are older, 71% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2008 · median 2014 among the 271 with a school on file
- Record last updated2017 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Louisiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Louisiana
There are 340 hospitalist physician records in Louisiana.
All 340 in Louisiana → Every provider in New Orleans → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Robert Andres, M.D.New Orleans, LA 701121043653686
- Deepa Bhatnagar, M.D.New Orleans, LA 701121205039294
- Chayan Chakraborti, M.D.New Orleans, LA 701121457300535
- Heather ChauNew Orleans, LA 701121144647298
- Mariano Iberico, M.D.New Orleans, LA 701121831431238
- Jacey Jones, MDNew Orleans, LA 701121225472707
- Marlowe Maylin, MDNew Orleans, LA 701121669572558
- Geraldine Menard, MDNew Orleans, LA 701121073685616
Common questions
What is John Derrick Marker, M.D.'s NPI number?
John Derrick Marker, M.D.'s National Provider Identifier (NPI) is 1942477583, issued on May 13, 2008. An NPI identifies a provider in billing; it is not a license.
Where is John Derrick Marker, M.D. located?
The NPPES record lists a practice address at 1430 Tulane Ave SL 50, New Orleans, LA, 70112. Phone: (504) 988-7809. Providers update this record themselves, so call before visiting.
How can I verify John Derrick Marker, M.D.'s license?
NPPES lists Louisiana license number MD.204045, 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 Derrick Marker, M.D. prescribe under Medicare Part D?
In 2024, John Derrick Marker, M.D. had 555 Medicare Part D claims for 165 beneficiaries; the average among hospitalist physician prescribers was 521. 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.