Brian G. Williams, PA-C
NPI 1598701914ActiveIndividual· Physician Assistant· Porterville, CA
Physician Assistant (PA-C) with Sequoia Healthcare Alliance, practicing in Porterville, California. Their prescriptions cost Medicare Part D more than their services did: $101,164 for 1,222 claims, against $31,214 paid for services in 2024. Otsuka America Pharmaceutical, Inc. was the largest of 6 companies reporting payments in 2025, $206.23 in all, mostly food and beverage. Lists Sierra View Medical Center as a hospital affiliation.
Overview
| NPI | 1598701914 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Jun 22, 2006 |
| Last updated in NPPES | Dec 23, 2025 |
| Certified by provider | Dec 23, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA12516 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 264 |
|---|---|
| Services billed | 642 across 34 procedure codes |
| Paid by Medicare | $31,214 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,222 · 2,189 30-day fills |
|---|---|
| Patients | 341 |
| Total drug cost | $101,164 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Sequoia Healthcare AlliancePorterville, CA · 14 clinicians
Hospital affiliation
- Sierra View Medical CenterPorterville, CA
Industry payments (Open Payments)
- 2025$206.23 · 10 payments from 6 companies
- 2024$1,075 · 52 payments from 18 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | $64.81 | 3 |
| Astellas Pharma US Inc | $44.26 | 2 |
| Lilly USA, LLC | $42.62 | 2 |
| Novo Nordisk Inc | $23.20 | 1 |
| Astrazeneca Pharmaceuticals LP | $15.95 | 1 |
What the 2025 payments were for
- Food and Beverage$206.23 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 33 physician assistants in Porterville · All physician assistants in California