Diana Catherine Diemer, FNP
NPI 1104313436ActiveIndividual· Family Medicine· Hastings, MI
Family Medicine (FNP) with Thornapple Valley Family Physicians PC, practicing in Hastings, Michigan. Their prescriptions cost Medicare Part D more than their services did: $177,984 for 1,264 claims, against $3,183 paid for services in 2024. Novo Nordisk Inc was the largest of 20 companies reporting payments in 2025, $1,276 in all, mostly food and beverage. Lists Corewell Health Pennock Hospital as a hospital affiliation.
Overview
| NPI | 1104313436 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | FNP |
| Sole proprietor | No |
| NPI issued | Apr 23, 2018 |
| Last updated in NPPES | Apr 23, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 4704272488 | 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 - Nurse Practitioner (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 22 |
|---|---|
| Services billed | 76 across 14 procedure codes |
| Paid by Medicare | $3,183 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,264 · 2,181 30-day fills |
|---|---|
| Patients | 187 |
| Total drug cost | $177,984 |
| Generic share | 77% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Thornapple Valley Family Physicians PCHastings, MI · 5 clinicians
Hospital affiliation
- Corewell Health Pennock HospitalHastings, MI
Industry payments (Open Payments)
- 2025$1,276 · 88 payments from 20 companies
- 2024$1,286 · 100 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $302.47 | 21 |
| Astrazeneca Pharmaceuticals LP | $241.26 | 27 |
| Glaxosmithkline, LLC. | $86.09 | 5 |
| Amgen Inc. | $76.91 | 5 |
| Lilly USA, LLC | $72.24 | 4 |
What the 2025 payments were for
- Food and Beverage$1,276 · 88 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 21 family medicine physicians in Hastings · All family medicine physicians in Michigan