Greigstone Montgomery Yearwood, M.D.
NPI 1689631640ActiveIndividual· Internal Medicine· Woonsocket, RI
Internal Medicine (M.D.) with Prime Healthcare Services Landmark LLC, practicing in Woonsocket, Rhode Island. Their prescriptions cost Medicare Part D more than their services did: $1,033,052 for 11,726 claims, against $36,961 paid for services in 2024. Pfizer Inc. was the largest of 15 companies reporting payments in 2025, $1,058 in all, mostly food and beverage. Lists Landmark Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1689631640 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 26, 2006 |
| Last updated in NPPES | Jul 16, 2026 |
| Certified by provider | Jul 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MD07911 | RI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (RI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 169 |
|---|---|
| Services billed | 390 across 15 procedure codes |
| Paid by Medicare | $36,961 |
Part D prescriptions in 2024
| Prescriptions (claims) | 11,726 · 22,286 30-day fills |
|---|---|
| Patients | 589 |
| Total drug cost | $1,033,052 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Prime Healthcare Services Landmark LLCWoonsocket, RI · 49 clinicians
Hospital affiliations
- Landmark Medical CenterWoonsocket, RI
- The Miriam HospitalProvidence, RI
Other facilities
- Nurse on CallHome health agency · Lincoln, RI
Industry payments (Open Payments)
- 2025$1,058 · 48 payments from 15 companies
- 2024$1,053 · 52 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $285.61 | 9 |
| Astrazeneca Pharmaceuticals LP | $137.44 | 7 |
| Novo Nordisk Inc | $121.89 | 6 |
| Glaxosmithkline, LLC. | $115.84 | 6 |
| Phathom Pharmaceuticals, Inc. | $79.92 | 4 |
What the 2025 payments were for
- Food and Beverage$1,038 · 47 payments
- Education$20.22 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 37 internal medicine physicians in Woonsocket · All internal medicine physicians in Rhode Island