Mark Jason Diaz, PA-C, MS, MPH
NPI 1164942116ActiveIndividual· Physician Assistant· Davis, CA
Physician Assistant (PA-C, MS, MPH) with Permanente Medical Group Inc, practicing in Davis, California. 112 Medicare patients in 2024, $16,220 paid; nearly all of their 258 Part D prescriptions were generic (99%).
Overview
| NPI | 1164942116 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C, MS, MPH |
| Sole proprietor | No |
| NPI issued | Jun 21, 2017 |
| Last updated in NPPES | Jul 3, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 54564 | CA |
| Physician Assistant, Surgical | 363AS0400X | 54564 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 112 |
|---|---|
| Services billed | 3,967 across 34 procedure codes |
| Paid by Medicare | $16,220 |
Part D prescriptions in 2024
| Prescriptions (claims) | 258 · 260 30-day fills |
|---|---|
| Patients | 93 |
| Total drug cost | $2,740 |
| Generic share | 99% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Permanente Medical Group IncOakland, CA · 10,996 clinicians
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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