Holly Vanderwerff
NPI 1194195966ActiveIndividual· Physician Assistant· Troy, MI
Physician Assistant with Affiliated Troy Dermatologists, PLLC, practicing in Troy, Michigan. Their prescriptions cost Medicare Part D more than their services did: $168,675 for 1,259 claims, against $6,231 paid for services in 2024. Genzyme Corporation was the largest of 21 companies reporting payments in 2025, $1,707 in all, mostly food and beverage. Lists Beaumont Hospital Royal Oak as a hospital affiliation.
Overview
| NPI | 1194195966 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Oct 5, 2015 |
| Last updated in NPPES | Oct 5, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 5601007515 | 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 - Physician Assistant (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 59 |
|---|---|
| Services billed | 174 across 19 procedure codes |
| Paid by Medicare | $6,231 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,259 · 1,456 30-day fills |
|---|---|
| Patients | 590 |
| Total drug cost | $168,675 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Affiliated Troy Dermatologists, PLLCTroy, MI · 5 clinicians
Hospital affiliation
- Beaumont Hospital Royal OakRoyal Oak, MI
Industry payments (Open Payments)
- 2025$1,707 · 71 payments from 21 companies
- 2024$1,913 · 73 payments from 18 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $291.80 | 8 |
| Amgen Inc. | $219.14 | 7 |
| Janssen Biotech, Inc. | $164.67 | 9 |
| Ucb, Inc. | $156.87 | 4 |
| Abbvie Inc. | $150.00 | 8 |
What the 2025 payments were for
- Food and Beverage$1,694 · 70 payments
- Education$13.17 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 237 physician assistants in Troy · All physician assistants in Michigan