Monica Maria Villafana Diaz, PA-C
NPI 1790488302ActiveIndividual· Physician Assistant· Oakland, CA
Physician Assistant (PA-C) with Gina Tobalina MD Inc, practicing in Oakland, California. Their prescriptions cost Medicare Part D more than their services did: $137,688 for 1,711 claims, against $6,188 paid for services in 2024. Lists Sutter Roseville Medical Center as a hospital affiliation.
Overview
| NPI | 1790488302 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Mar 23, 2023 |
| Last updated in NPPES | Mar 23, 2023 |
| Certified by provider | Mar 23, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 62516 | 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 | 30 |
|---|---|
| Services billed | 111 across 19 procedure codes |
| Paid by Medicare | $6,188 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,711 · 3,784 30-day fills |
|---|---|
| Patients | 268 |
| Total drug cost | $137,688 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2022 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Gina Tobalina MD IncFolsom, CA · 5 clinicians
Hospital affiliation
- Sutter Roseville Medical CenterRoseville, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 174 physician assistants in Oakland · All physician assistants in California