Gregory Stempky, DO
NPI 1639123557ActiveIndividual· Family Medicine· Spring Lake, MI
Family Medicine (DO) in Spring Lake, Michigan, trained at Michigan State University College of Osteopathic Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $164,173 for 1,509 claims, against $7,636 paid for services in 2024. Novo Nordisk Inc was the largest of 8 companies reporting payments in 2025, $270.57 in all, mostly food and beverage.
Overview
| NPI | 1639123557 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 22, 2006 |
| Last updated in NPPES | Apr 11, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 5101013060 | 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 | 23 |
|---|---|
| Services billed | 291 across 14 procedure codes |
| Paid by Medicare | $7,636 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,509 · 2,685 30-day fills |
|---|---|
| Patients | 71 |
| Total drug cost | $164,173 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Michigan State University College of Osteopathic Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Family Practice |
Hospital affiliations
- Spectrum HealthGrand Rapids, MI
- Trinity Health Grand Haven HospitalGrand Haven, MI
- Trinity Health Muskegon HospitalMuskegon, MI
Industry payments (Open Payments)
- 2025$270.57 · 13 payments from 8 companies
- 2024$448.11 · 19 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $108.70 | 5 |
| Lilly USA, LLC | $36.05 | 2 |
| Pfizer Inc. | $28.19 | 1 |
| Abiomed | $24.28 | 1 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $23.12 | 1 |
What the 2025 payments were for
- Food and Beverage$270.57 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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