William H. Sierra, PA
NPI 1992721229ActiveIndividual· Physician Assistant· West Islip, NY
Physician Assistant (PA) in West Islip, New York, licensed in NY, with an NPI issued in July 2006. Part D covered 11 prescriptions written in 2024, 100% of them generic. Sanofi-Aventis U.S. LLC was the largest of 3 companies reporting payments in 2025, $195.96 in all, mostly food and beverage.
Overview
| NPI | 1992721229 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | No |
| NPI issued | Jul 13, 2006 |
| Last updated in NPPES | May 29, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 002312 | NY |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 11 · 11 30-day fills |
|---|---|
| Total drug cost | $94.08 |
| Generic share | 100% of claims |
Industry payments (Open Payments)
- 2025$195.96 · 4 payments from 3 companies
- 2024$492.33 · 15 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sanofi-Aventis U.S. LLC | $149.13 | 2 |
| Seqirus USA Inc | $28.39 | 1 |
| Glaxosmithkline, LLC. | $18.44 | 1 |
What the 2025 payments were for
- Food and Beverage$195.96 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 116 physician assistants in West Islip · All physician assistants in New York