Dr. John Derrick Marker, MD
- Medicare services, 2024
- 283
- Medicare patients, 2024
- 92
- Part D claims, 2024
- 555
- Hospital affiliations
- 1
- Industry payments
- $204
- Practice address
- 1516 Jefferson Hwy, New Orleans, LA 70121
- Practice phone
- Call (504) 842-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marker's professional email, personal email and mobile number
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Dr. John Derrick Marker is a hospitalist in New Orleans, Louisiana
Dr. Marker practices at Ochsner Medical Center - New Orleans in New Orleans, Louisiana, part of Ochsner Health System.
Dr. Marker's NPI, 1942477583, was assigned on May 13, 2008. Dr. Marker graduated from Tulane University School of Medicine in 2008. Dr. Marker holds Louisiana license MD.204045.
- NPI
- 1942477583NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365611126
- NPI enumeration date
- May 13, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (504) 842-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Derrick Marker practices at Ochsner Medical Center - New Orleans in New Orleans, Louisiana
Dr. Marker's primary practice is Ochsner Medical Center - New Orleans, at 1516 Jefferson Hwy, New Orleans, LA 70121 in Jefferson Parish. The practice phone is (504) 842-3000.
- Ochsner Medical Center - New Orleans1516 Jefferson Hwy, New Orleans, LA 70121 · Jefferson ParishPhone(504) 842-3000
Source: Dmand AI Affiliation Data
Dr. John Derrick Marker is affiliated with 3 sites of care and 4 medical groups
Dr. Marker's primary practice is Ochsner Medical Center - New Orleans in New Orleans, Louisiana, part of Ochsner Health System. The medical group on file is Ochsner Health. Dmand AI also links Dr. Marker to 3 more medical groups, 1 group practice or clinic and 1 home health agency, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Derrick Marker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marker practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ochsner Medical Center - New Orleans | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Ochsner Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John Derrick Marker is one of 324 hospitalists in Louisiana
Hospitalist is Dr. Marker's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Marker is licensed in Louisiana.
Specialties and state licenses
- Hospitalist, LouisianaPrimary
Hospitalists near Dr. Marker
Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Derrick Marker billed Medicare for 283 services in 2024
CMS data shows 283 Medicare services from Dr. Marker across 4 procedure codes in 2024, for 92 Medicare patients. Medicare paid $24,781 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Marker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2592024: 2839%
Dr. Marker compared with the Louisiana median for hospitalists, 2024
- Dr. Marker
- Louisiana median
- Medicare services
- 283vs 34418% below
- Medicare patients
- 92vs 15641% below
- Part D claims
- 252vs 902.8 times
Medians across 307 hospitalists in Louisiana with Dmand AI profiles that report each measure.
Dr. Marker's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Derrick Marker treated 92 Medicare patients in 2024, average age 74
CMS counts 92 Medicare patients who saw Dr. Marker in 2024. The largest group is 65 to 74, with 29 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 32% are also on Medicaid. Their average risk score is 2.54, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Marker's median patient age at 71, with 61% women.
Dr. Marker's Medicare patients by age, 2024
Dr. Marker's Medicare patients by sex, 2024
- Women5762%
- Men3538%
Chronic conditions among Dr. Marker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease50%
- Arthritis48%
- Heart failure45%
- Diabetes42%
- Mood disorders38%
- Ischemic heart disease36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women61%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Derrick Marker wrote 555 Medicare Part D claims in 2024
In 2024, Dr. Marker wrote 555 Medicare Part D claims for 165 patients. 88% of them were for generic drugs. CMS names the drug for 252 of them, across 14 drugs with 11 or more claims each, at $9,370 in total drug cost. In 2023, CMS named 275 claims across 15 drugs.
Dr. Marker's Part D claims by kind of drug, 2024
- Generic490 claims88%
- Brand-name65 claims12%
Dr. Marker's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Marker's Part D claims, 2024
- Opioids3%18 of 555 claims
- Antibiotics8%46 of 555 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2752024: 2528%
Drugs named by CMS: 14 in 2024, 15 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John Derrick Marker takes part in Medicare
Dr. Marker accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John Derrick Marker received $204 in industry payments from 2016 to 2017
CMS Open Payments shows 12 general payments to Dr. Marker from 7 drug and device companies from 2016 to 2017. Food and beverage make up the largest share, 100% of the total. Otsuka America Pharmaceutical, Inc. paid the most, $58.
General payments to Dr. Marker by program year, 2016 to 2017
Companies that paid Dr. Marker the most, 2016 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Derrick Marker graduated from Tulane University School of Medicine
Dr. Marker graduated from Tulane University School of Medicine in 2008.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John Derrick Marker's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Derrick Marker
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Derrick Marker's NPI number?
Dr. John Derrick Marker's NPI number is 1942477583. It was assigned on May 13, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. John Derrick Marker?
Dr. John Derrick Marker is a hospitalist in New Orleans, Louisiana. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. John Derrick Marker practice?
Dr. Marker practices at 1516 Jefferson Hwy, New Orleans, LA 70121. Dr. Marker's primary practice is Ochsner Medical Center - New Orleans in New Orleans, Louisiana, part of Ochsner Health System. Dmand AI also links Dr. Marker to 3 medical groups, 1 group practice or clinic and 1 home health agency.
What is Dr. John Derrick Marker's office phone number?
The practice phone on file for Dr. Marker is (504) 842-3000.
What is Dr. John Derrick Marker's medical license number?
Dr. Marker holds Louisiana license MD.204045.
Which hospitals is Dr. John Derrick Marker affiliated with?
Dr. Marker practices at Ochsner Medical Center - New Orleans in New Orleans, Louisiana.
What medical group is Dr. John Derrick Marker part of?
Dr. Marker is linked to Ochsner Health. Dmand AI links Dr. Marker to 3 more medical groups.
Does Dr. John Derrick Marker accept Medicare?
Yes. CMS data shows Dr. Marker billed Medicare for 283 services in 2024, and Dr. Marker accepts Medicare assignment.
How many Medicare patients does Dr. John Derrick Marker see?
CMS counts 92 Medicare patients who saw Dr. Marker in 2024, with an average age of 74.
What services does Dr. John Derrick Marker bill to Medicare?
In 2024, Dr. Marker's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99239) and hospital inpatient care (99232).
Show 4 more questionsShow fewer questions
Where did Dr. John Derrick Marker go to medical school?
Dr. Marker graduated from Tulane University School of Medicine in 2008.
What drugs does Dr. John Derrick Marker prescribe most?
In 2024 Medicare Part D data, Dr. Marker's most prescribed drugs by claims were Nifedipine ER, Pantoprazole Sodium and Carvedilol.
Has Dr. John Derrick Marker received payments from drug or device companies?
CMS Open Payments shows $204 in general payments to Dr. Marker from 7 companies from 2016 to 2017. The largest total came from Otsuka America Pharmaceutical, Inc.
How long has Dr. John Derrick Marker been practicing?
Dr. Marker graduated from medical school in 2008, 18 years ago.
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