Ellen Marie Diefenderfer, PA-C
NPI 1073909289ActiveIndividual· Physician Assistant· Columbus, OH
Physician Assistant (PA-C) with Osu Surgery, LLC, practicing in Columbus, Ohio. 61 Medicare patients in 2024, $3,895 paid; nearly all of their 63 Part D prescriptions were generic (95%). Astrazeneca Pharmaceuticals LP reported $122.38 in payments in 2025, mostly food and beverage. Lists Ohio State University State Health System as a hospital affiliation.
Overview
| NPI | 1073909289 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Apr 14, 2015 |
| Last updated in NPPES | May 19, 2026 |
| Certified by provider | May 19, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 50.004326RX | OH |
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 - Physician Assistant (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 61 |
|---|---|
| Services billed | 77 across 13 procedure codes |
| Paid by Medicare | $3,895 |
Part D prescriptions in 2024
| Prescriptions (claims) | 63 · 69 30-day fills |
|---|---|
| Patients | 39 |
| Total drug cost | $1,170 |
| Generic share | 95% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Osu Surgery, LLCColumbus, OH · 210 clinicians
Hospital affiliation
- Ohio State University State Health SystemColumbus, OH
Industry payments (Open Payments)
- 2025$122.38 · 1 payment from 1 company
- 2024$2,033 · 14 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $122.38 | 1 |
What the 2025 payments were for
- Food and Beverage$122.38 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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