Marcellus Walker, MD
NPI 1003038274 · Internal Medicine Physician · Brooklyn, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcellus Walker, MD is a Internal Medicine Physician provider in Brooklyn, NY (NPI 1003038274).
Provider details
- NPI number
- 1003038274
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD039838E (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
600 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 270 | $102 |
| Detection Test By Immunoassay Technique for Severe Acute Respiratory Syndrome Coronavirus and Influenza87428 | 98 | $69 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 55 | $143 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 43 | $125 |
| Automated Urinalysis Test81003 | 32 | $2 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 129 | 107 |
| Doxycycline Monohydrate | 71 | 71 |
| Fluticasone Propionate | 58 | 50 |
| Cefdinir | 43 | 43 |
| Nirmatrelvir/Ritonavirbrand: Paxlovid | 36 | 33 |
| Azithromycin | 24 | 22 |
| Valacyclovir Hclbrand: Valacyclovir | 22 | 19 |
| Mupirocin | 21 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-03
- Last updated
- 2020-12-08
- Certified
- 2020-12-08
Frequently asked questions
- What is Marcellus Walker's NPI number?
- Marcellus Walker's National Provider Identifier (NPI) is 1003038274, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcellus Walker's specialty?
- Marcellus Walker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marcellus Walker located?
- Marcellus Walker's practice location on file with NPPES is 2094 Pitkin Ave, Brooklyn, NY 11207-3509.
- What is Marcellus Walker's phone number?
- The practice phone number listed in the NPPES registry for Marcellus Walker is (718) 240-0516.
- Does Marcellus Walker accept Medicare?
- Marcellus Walker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcellus Walker's NPI active?
- Yes — Marcellus Walker's NPI (1003038274) is active in the NPPES registry as of the last update on 2020-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.