Elizabeth Callahan, PA
NPI 1578855565ActiveIndividual· Physician Assistant· West Islip, NY
Physician Assistant (PA) with Samaritan Medical Services PC, practicing in West Islip, New York. Medicare paid $81,797 for services to 729 patients in 2024. Shionogi Inc was the largest of 3 companies reporting payments in 2025, $263.87 in all, mostly food and beverage. Lists Good Samaritan Hospital Medical Center as a hospital affiliation.
Overview
| NPI | 1578855565 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | Yes |
| NPI issued | May 9, 2011 |
| Last updated in NPPES | Mar 16, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 014696-1 | NY |
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 (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 729 |
|---|---|
| Services billed | 1,336 across 11 procedure codes |
| Paid by Medicare | $81,797 |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Samaritan Medical Services PCWest Islip, NY · 354 clinicians
Hospital affiliation
- Good Samaritan Hospital Medical CenterWest Islip, NY
Industry payments (Open Payments)
- 2025$263.87 · 4 payments from 3 companies
- 2024$37.64 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Shionogi Inc | $128.47 | 2 |
| Melinta Therapeutics, LLC | $121.83 | 1 |
| Chiesi USA, Inc. | $13.57 | 1 |
What the 2025 payments were for
- Food and Beverage$263.87 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 116 physician assistants in West Islip · All physician assistants in New York