Aaron Highsmith, PA
NPI 1124290093ActiveIndividual· Physician Assistant· Simi Valley, CA
Physician Assistant (PA) with Premier Diagnostic and Interventional Specialists, practicing in Simi Valley, California. Mostly services rather than prescriptions: Medicare paid $53,455 for 232 patients in 2024, with only 44 Part D claims. Sirtex Medical Inc was the largest of 4 companies reporting payments in 2025, $308.73 in all, mostly food and beverage. Lists Providence Holy Cross Medical Center as a hospital affiliation.
Overview
| NPI | 1124290093 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | No |
| NPI issued | Mar 31, 2008 |
| Last updated in NPPES | Mar 31, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 19698 | 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 | 232 |
|---|---|
| Services billed | 675 across 17 procedure codes |
| Paid by Medicare | $53,455 |
Part D prescriptions in 2024
| Prescriptions (claims) | 44 · 48 30-day fills |
|---|---|
| Patients | 30 |
| Total drug cost | $6,562 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2008 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Premier Diagnostic and Interventional SpecialistsMission Hills, CA · 7 clinicians
Hospital affiliation
- Providence Holy Cross Medical CenterMission Hills, CA
Industry payments (Open Payments)
- 2025$308.73 · 7 payments from 4 companies
- 2024$91.43 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sirtex Medical Inc | $128.84 | 1 |
| Siemens Medical Solutions USA, Inc. | $109.89 | 4 |
| Microvention, Inc. | $36.70 | 1 |
| Teleflex LLC | $33.30 | 1 |
What the 2025 payments were for
- Food and Beverage$308.73 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 36 physician assistants in Simi Valley · All physician assistants in California