Leah Ayn Mergen, PA-C
NPI 1023389392ActiveIndividual· Physician Assistant· Sioux Falls, SD
Physician Assistant (PA-C) with Avera McKennan, practicing in Sioux Falls, South Dakota. Their prescriptions cost Medicare Part D more than their services did: $150,935 for 2,673 claims, against $13,536 paid for services in 2024. Actelion Pharmaceuticals US, Inc. was the largest of 2 companies reporting payments in 2025, $55.40 in all, mostly food and beverage. Lists Avera McKennan Hospital & University Health Center as a hospital affiliation.
Overview
| NPI | 1023389392 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Jan 19, 2012 |
| Last updated in NPPES | Aug 29, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 0799 | SD |
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 (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 131 |
|---|---|
| Services billed | 258 across 21 procedure codes |
| Paid by Medicare | $13,536 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,673 · 4,802 30-day fills |
|---|---|
| Patients | 234 |
| Total drug cost | $150,935 |
| Generic share | 90% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Avera McKennanSioux Falls, SD · 959 clinicians
Hospital affiliation
- Avera McKennan Hospital & University Health CenterSioux Falls, SD
Other facilities
- Avera @ HomeHome health agency · Sioux Falls, SD
Industry payments (Open Payments)
- 2025$55.40 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Actelion Pharmaceuticals US, Inc. | $30.83 | 1 |
| Hologic Sales and Service, LLC | $24.57 | 1 |
What the 2025 payments were for
- Food and Beverage$55.40 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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