Grisel Mac Williams, MD
NPI 1053396549ActiveIndividual· Internal Medicine· Hialeah, FL
Internal Medicine (MD) in Hialeah, Florida, licensed in FL, with an NPI issued in December 2005. Their prescriptions cost Medicare Part D more than their services did: $787,058 for 6,756 claims, against $35,274 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 5 companies reporting payments in 2025, $296.81 in all, mostly food and beverage.
Overview
| NPI | 1053396549 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Dec 7, 2005 |
| Last updated in NPPES | Jan 8, 2021 |
| Certified by provider | Jan 8, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | ME0045706 | FL |
| Specialist | 174400000X | ME0045706 | FL |
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 (FL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 38 |
|---|---|
| Services billed | 419 across 12 procedure codes |
| Paid by Medicare | $35,274 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,756 · 14,450 30-day fills |
|---|---|
| Patients | 343 |
| Total drug cost | $787,058 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 1980 |
|---|---|
| Medicare specialty | Internal Medicine |
Other facilities
- Mgn Healthcare ServicesHome health agency · Miami Lakes, FL
Industry payments (Open Payments)
- 2025$296.81 · 15 payments from 5 companies
- 2024$481.15 · 21 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $149.89 | 7 |
| Kowa Pharmaceuticals America, Inc. | $59.71 | 3 |
| Novo Nordisk Inc | $37.49 | 2 |
| Lilly USA, LLC | $34.66 | 2 |
| Abbott Laboratories | $15.06 | 1 |
What the 2025 payments were for
- Food and Beverage$296.81 · 15 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 253 internal medicine physicians in Hialeah · All internal medicine physicians in Florida