Silvia Alonzo, MS, PA-C
NPI 1942586623ActiveIndividual· Physician Assistant, Medical· Diamond Bar, CA
Physician Assistant, Medical (MS, PA-C) with Providence Medical Foundation, practicing in Diamond Bar, California. Their prescriptions cost Medicare Part D more than their services did: $208,653 for 2,771 claims, against $22,901 paid for services in 2024. Astrazeneca Pharmaceuticals LP reported $22.75 in payments in 2025, mostly food and beverage. Lists Providence St. Jude Medical Center as a hospital affiliation.
Overview
| NPI | 1942586623 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MS, PA-C |
| Sole proprietor | Yes |
| NPI issued | Oct 26, 2011 |
| Last updated in NPPES | Oct 14, 2021 |
| Certified by provider | Oct 14, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant, Medical Primary | 363AM0700X | PA21842 | 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 | 145 |
|---|---|
| Services billed | 422 across 51 procedure codes |
| Paid by Medicare | $22,901 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,771 · 6,575 30-day fills |
|---|---|
| Patients | 495 |
| Total drug cost | $208,653 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliation
- Providence St. Jude Medical CenterFullerton, CA
Other facilities
- Providence at Home With Compassus Home Health, Inland EmpireHome health agency · Pomona, CA
Industry payments (Open Payments)
- 2025$22.75 · 1 payment from 1 company
- 2024$165.14 · 8 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $22.75 | 1 |
What the 2025 payments were for
- Food and Beverage$22.75 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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