Michael S. Greiner, NP-C, D.C.
NPI 1942452453ActiveIndividual· Nurse Practitioner· Warren, MI
Nurse Practitioner (NP-C, D.C.) with Medcare Inc, practicing in Warren, Michigan. Their prescriptions cost Medicare Part D more than their services did: $10,168 for 639 claims, against $2,365 paid for services in 2024. Saluda Medical Americas, Inc. was the largest of 7 companies reporting payments in 2025, $731.43 in all, mostly food and beverage.
Overview
| NPI | 1942452453 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP-C, D.C. |
| Sole proprietor | Yes |
| NPI issued | Oct 15, 2008 |
| Last updated in NPPES | Oct 19, 2026 |
| Certified by provider | Oct 19, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 4704370015 | MI |
| Chiropractor | 111N00000X | MG009739 | MI |
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 - Chiropractic (MI); Practitioner - Nurse Practitioner (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 32 |
|---|---|
| Services billed | 80 across 3 procedure codes |
| Paid by Medicare | $2,365 |
Part D prescriptions in 2024
| Prescriptions (claims) | 639 · 665 30-day fills |
|---|---|
| Patients | 219 |
| Total drug cost | $10,168 |
| Generic share | 100% of claims |
Education and affiliations
| Graduation year | 2023 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Medcare IncWarren, MI · 10 clinicians
Industry payments (Open Payments)
- 2025$731.43 · 17 payments from 7 companies
- 2024$180.45 · 4 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Saluda Medical Americas, Inc. | $470.25 | 8 |
| Spr Therapeutics, Inc | $102.58 | 1 |
| Ferring Pharmaceuticals Inc. | $72.53 | 4 |
| Abbvie Inc. | $25.31 | 1 |
| Si-Bone, Inc. | $21.48 | 1 |
What the 2025 payments were for
- Food and Beverage$731.43 · 17 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 33 nurse practitioners in Warren · All nurse practitioners in Michigan