Tammy S. Willett, AGNP
NPI 1568694776ActiveIndividual· Nurse Practitioner, Adult Health· Flint, MI
Nurse Practitioner, Adult Health (AGNP) with Cancer and Hematology Centers of Western Mi, P.C., practicing in Flint, Michigan. Their prescriptions cost Medicare Part D more than their services did: $635,973 for 476 claims, against $48,946 paid for services in 2024. Novocure Inc. was the largest of 8 companies reporting payments in 2025, $226.55 in all, mostly food and beverage. Lists Banner Boswell Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1568694776 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | AGNP |
| Sole proprietor | No |
| NPI issued | Aug 20, 2009 |
| Last updated in NPPES | Dec 1, 2025 |
| Certified by provider | Dec 1, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Adult Health Primary | 363LA2200X | 4704199297 | MI |
| Nurse Practitioner | 363L00000X | SNP20012 | CO |
| Nurse Practitioner | 363L00000X | AP3372 | AZ |
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 - Nurse Practitioner (AZ); Practitioner - Nurse Practitioner (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 353 |
|---|---|
| Services billed | 586 across 5 procedure codes |
| Paid by Medicare | $48,946 |
Part D prescriptions in 2024
| Prescriptions (claims) | 476 · 699 30-day fills |
|---|---|
| Patients | 182 |
| Total drug cost | $635,973 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Cancer and Hematology Centers of Western Mi, P.C.Holland, MI · 110 clinicians
Hospital affiliations
- Banner Boswell Medical CenterSun City, AZ
- Banner Thunderbird Medical CenterGlendale, AZ
- Spectrum HealthGrand Rapids, MI
Industry payments (Open Payments)
- 2025$226.55 · 8 payments from 8 companies
- 2024$65.00 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novocure Inc. | $83.13 | 1 |
| Aimmune Therapeutics, Inc. | $27.34 | 1 |
| Syndax Pharmaceuticals, Inc. | $25.50 | 1 |
| Merck Sharp & Dohme LLC | $22.79 | 1 |
| Azurity Pharmaceuticals, Inc. | $18.76 | 1 |
What the 2025 payments were for
- Food and Beverage$226.55 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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