Michael J. Duffy, PA
NPI 1801839188ActiveIndividual· Physician Assistant· Oakland, CA
Physician Assistant (PA) in Oakland, California, licensed in CA, with an NPI issued in June 2006. Their prescriptions cost Medicare Part D more than their services did: $46,879 for 708 claims, against $8,022 paid for services in 2024. Mentor Worldwide LLC reported $18.71 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1801839188 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | No |
| NPI issued | Jun 14, 2006 |
| Last updated in NPPES | Jul 21, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA11368 | 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 | 105 |
|---|---|
| Services billed | 221 across 32 procedure codes |
| Paid by Medicare | $8,022 |
Part D prescriptions in 2024
| Prescriptions (claims) | 708 · 1,057 30-day fills |
|---|---|
| Patients | 386 |
| Total drug cost | $46,879 |
| Generic share | 86% of claims |
Industry payments (Open Payments)
- 2025$18.71 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mentor Worldwide LLC | $18.71 | 1 |
What the 2025 payments were for
- Food and Beverage$18.71 · 1 payment
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