Mark D. Williams, PA-C
NPI 1255369765ActiveIndividual· Physician Assistant· Salem, OR
Physician Assistant (PA-C) with Silver Falls Dermatology LLC, practicing in Salem, Oregon. Their prescriptions cost Medicare Part D more than their services did: $726,502 for 1,181 claims, against $109,150 paid for services in 2024. Janssen Biotech, Inc. was the largest of 6 companies reporting payments in 2025, $517.52 in all, mostly food and beverage. Lists Samaritan Albany General Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1255369765 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Jun 30, 2006 |
| Last updated in NPPES | Jul 13, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA00623 | OR |
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 (OR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 613 |
|---|---|
| Services billed | 3,155 across 27 procedure codes |
| Paid by Medicare | $109,150 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,181 · 1,472 30-day fills |
|---|---|
| Patients | 498 |
| Total drug cost | $726,502 |
| Generic share | 94% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Silver Falls Dermatology LLCMill Creek, WA · 101 clinicians
Hospital affiliations
- Samaritan Albany General HospitalAlbany, OR
- Samaritan Lebanon Community HospitalLebanon, OR
- Samaritan Pacific Community HospitalNewport, OR
Industry payments (Open Payments)
- 2025$517.52 · 34 payments from 6 companies
- 2024$1,055 · 80 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $346.80 | 23 |
| Ucb, Inc. | $60.33 | 4 |
| Abbvie Inc. | $45.63 | 3 |
| Genzyme Corporation | $32.13 | 2 |
| Pfizer Inc. | $18.56 | 1 |
What the 2025 payments were for
- Food and Beverage$434.57 · 33 payments
- Education$82.95 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 131 physician assistants in Salem · All physician assistants in Oregon