John W. Hamersma, M.D.
NPI 1033108329ActiveIndividual· Family Medicine· Wyoming, MI
Family Medicine (M.D.) in Wyoming, Michigan, trained at Michigan State University College of Human Medicine (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $1,099,170 for 9,085 claims, against $42,084 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 3 companies reporting payments in 2025, $78.13 in all, mostly food and beverage.
Overview
| NPI | 1033108329 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 19, 2005 |
| Last updated in NPPES | Jun 21, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 4301074575 | MI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Family Practice (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 109 |
|---|---|
| Services billed | 1,202 across 48 procedure codes |
| Paid by Medicare | $42,084 |
Part D prescriptions in 2024
| Prescriptions (claims) | 9,085 · 22,623 30-day fills |
|---|---|
| Patients | 642 |
| Total drug cost | $1,099,170 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | Michigan State University College of Human Medicine |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Family Practice |
Medical groups
- Center for Physical Rehabilitation and Therapy LPGrand Rapids, MI · 369 clinicians
- Center for Physical Rehabilitation IncGrand Rapids, MI · 357 clinicians
- Grand Valley Medical Specialists PLCGrand Rapids, MI · 19 clinicians
Hospital affiliations
- Corewell Health Pennock HospitalHastings, MI
- Mercy Health Saint Mary'sGrand Rapids, MI
- Spectrum HealthGrand Rapids, MI
- University of Michigan Health - WestWyoming, MI
Other facilities
- Mary Free Bed at Home, LLCHome health agency · Grand Rapids, MI
Industry payments (Open Payments)
- 2025$78.13 · 3 payments from 3 companies
- 2024$40.23 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $38.00 | 1 |
| Merck Sharp & Dohme LLC | $25.47 | 1 |
| Exact Sciences Corporation | $14.66 | 1 |
What the 2025 payments were for
- Food and Beverage$78.13 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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