John Marker, M.D.
NPI 1942477583 · Hospitalist Physician · New Orleans, LA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Marker, M.D. is a Hospitalist Physician provider in New Orleans, LA (NPI 1942477583).
Provider details
- NPI number
- 1942477583
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
283 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 148 | $114 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 56 | $109 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 54 | $76 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 25 | $166 |
Typical Medicare-allowed amounts for these services range $76–$166 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Nifedipinebrand: Nifedipine Er | 30 | 21 |
| Pantoprazole Sodium | 28 | 23 |
| Carvedilol | 27 | 21 |
| Furosemide | 24 | 22 |
| Prednisone | 22 | 20 |
| Losartan Potassium | 17 | 14 |
| Amlodipine Besylate | 16 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-05-13
- Last updated
- 2017-04-03
Frequently asked questions
- What is John Marker's NPI number?
- John Marker's National Provider Identifier (NPI) is 1942477583, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Marker's specialty?
- John Marker is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is John Marker located?
- John Marker's practice location on file with NPPES is 1430 Tulane Ave Sl 50, New Orleans, LA 70112.
- What is John Marker's phone number?
- The practice phone number listed in the NPPES registry for John Marker is (504) 988-7809.
- Does John Marker accept Medicare?
- John Marker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Marker's NPI active?
- Yes — John Marker's NPI (1942477583) is active in the NPPES registry as of the last update on 2017-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.