Mary Elizabeth Karis, CRNP
NPI 1790448355ActiveIndividual· Nurse Practitioner· Hummelstown, PA
Nurse Practitioner (CRNP) with Penn State Health Medical Group LLC, practicing in Hummelstown, Pennsylvania. Their prescriptions cost Medicare Part D more than their services did: $140,807 for 2,248 claims, against $16,570 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 10 companies reporting payments in 2025, $385.51 in all, mostly food and beverage. Lists Milton S Hershey Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1790448355 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | CRNP |
| Sole proprietor | Yes |
| NPI issued | Oct 20, 2021 |
| Last updated in NPPES | Dec 17, 2024 |
| Certified by provider | Dec 17, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | SP024534 | PA |
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 - Nurse Practitioner (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 99 |
|---|---|
| Services billed | 341 across 38 procedure codes |
| Paid by Medicare | $16,570 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,248 · 4,984 30-day fills |
|---|---|
| Patients | 452 |
| Total drug cost | $140,807 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2021 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Penn State Health Medical Group LLCCamp Hill, PA · 734 clinicians
Hospital affiliations
- Milton S Hershey Medical CenterHershey, PA
- Penn State Health St. JosephReading, PA
Industry payments (Open Payments)
- 2025$385.51 · 20 payments from 10 companies
- 2024$414.92 · 20 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $106.53 | 6 |
| Lilly USA, LLC | $66.60 | 3 |
| Novo Nordisk Inc | $65.87 | 3 |
| Abbvie Inc. | $40.12 | 2 |
| Exact Sciences Corporation | $21.08 | 1 |
What the 2025 payments were for
- Food and Beverage$385.51 · 20 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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