Melissa Hansen Ambrosio, PA-C
NPI 1871837872ActiveIndividual· Physician Assistant· Ventura, CA
Physician Assistant (PA-C) with County of Ventura and 1 other group, practicing in Ventura, California. Their prescriptions cost Medicare Part D more than their services did: $665,527 for 344 claims, against $4,597 paid for services in 2024. Davol Inc. was the largest of 11 companies reporting payments in 2025, $921.07 in all, mostly food and beverage. Lists Community Memorial Hospital - Ojai and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1871837872 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Nov 15, 2012 |
| Last updated in NPPES | May 11, 2023 |
| Certified by provider | May 11, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 22711 | CA |
| Physician Assistant, Medical | 363AM0700X | 22711 | CA |
| Physician Assistant, Surgical | 363AS0400X | 22711 | 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 | 31 |
|---|---|
| Services billed | 143 across 16 procedure codes |
| Paid by Medicare | $4,597 |
Part D prescriptions in 2024
| Prescriptions (claims) | 344 · 440 30-day fills |
|---|---|
| Patients | 94 |
| Total drug cost | $665,527 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical groups
- County of VenturaVentura, CA · 344 clinicians
- Community Memorial Health SystemOxnard, CA · 185 clinicians
Hospital affiliations
- Community Memorial Hospital - OjaiOjai, CA
- Community Memorial Hospital - VenturaVentura, CA
- Ventura County Medical CenterVentura, CA
Industry payments (Open Payments)
- 2025$921.07 · 37 payments from 11 companies
- 2024$504.15 · 15 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Davol Inc. | $148.53 | 2 |
| Janssen Biotech, Inc. | $137.07 | 7 |
| Leo Pharma Inc. | $134.02 | 6 |
| Abbvie Inc. | $119.55 | 5 |
| Atricure, Inc. | $92.15 | 3 |
What the 2025 payments were for
- Food and Beverage$841.08 · 36 payments
- Education$79.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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