Katherine Grubbs Diefenderfer, NP
NPI 1730263807ActiveIndividual· Nurse Practitioner· Richmond, VA
Nurse Practitioner (NP) in Richmond, Virginia, licensed in VA, with an NPI issued in October 2006. Their prescriptions cost Medicare Part D more than their services did: $225,854 for 1,667 claims, against $30,927 paid for services in 2024. Lilly USA, LLC reported $119.60 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1730263807 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | No |
| NPI issued | Oct 25, 2006 |
| Last updated in NPPES | Nov 2, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 0024166667 | VA |
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 (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 302 |
|---|---|
| Services billed | 522 across 8 procedure codes |
| Paid by Medicare | $30,927 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,667 · 3,929 30-day fills |
|---|---|
| Patients | 433 |
| Total drug cost | $225,854 |
| Generic share | 88% of claims |
Industry payments (Open Payments)
- 2025$119.60 · 1 payment from 1 company
- 2024$451.46 · 10 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $119.60 | 1 |
What the 2025 payments were for
- Food and Beverage$119.60 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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