Marcella Donovan Walker, M.D.
NPI 1003989211ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· New York, NY
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in New York, New York, trained at Johns Hopkins University School of Medicine (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $203,362 for 387 claims, against $95,491 paid for services in 2024. Amgen Inc. was the largest of 4 companies reporting payments in 2025, $134.63 in all, mostly food and beverage.
Overview
| NPI | 1003989211 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 16, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 223814 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,033 |
|---|---|
| Services billed | 1,923 across 13 procedure codes |
| Paid by Medicare | $95,491 |
Part D prescriptions in 2024
| Prescriptions (claims) | 387 · 950 30-day fills |
|---|---|
| Patients | 105 |
| Total drug cost | $203,362 |
| Generic share | 70% of claims |
Education and affiliations
| Medical school | Johns Hopkins University School of Medicine |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Trustees of Columbia University in the City of New YorkNew York, NY · 2,296 clinicians
Hospital affiliations
- Greenwich Hospital Association -Greenwich, CT
- New York-Presbyterian HospitalNew York, NY
Industry payments (Open Payments)
- 2025$134.63 · 6 payments from 4 companies
- 2024$63.36 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $65.41 | 3 |
| Ascendis Pharma Endocrinology Inc | $28.95 | 1 |
| Radius Health, Inc. | $22.87 | 1 |
| Abbvie Inc. | $17.40 | 1 |
What the 2025 payments were for
- Food and Beverage$134.63 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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