Lisa Marie Ertman, CNP
NPI 1508573288ActiveIndividual· Nurse Practitioner, Primary Care· Fairmont, MN
Nurse Practitioner, Primary Care (CNP) with Cornerstone Clinic, PSC, practicing in Fairmont, Minnesota. Their prescriptions cost Medicare Part D more than their services did: $144,098 for 1,444 claims, against $15,991 paid for services in 2024. Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) was the largest of 8 companies reporting payments in 2025, $167.81 in all, mostly food and beverage. Lists Mayo Clinic Health System - Fairmont and 1 other hospital as hospital affiliations.
Overview
| NPI | 1508573288 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | CNP |
| Sole proprietor | No |
| NPI issued | Nov 1, 2022 |
| Last updated in NPPES | Aug 1, 2024 |
| Certified by provider | Jul 13, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Primary Care Primary | 363LP2300X | 9378 | MN |
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 - Nurse Practitioner (MN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 126 |
|---|---|
| Services billed | 384 across 45 procedure codes |
| Paid by Medicare | $15,991 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,444 · 2,436 30-day fills |
|---|---|
| Patients | 179 |
| Total drug cost | $144,098 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2022 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Cornerstone Clinic, PSCFairmont, MN · 5 clinicians
Hospital affiliations
- Mayo Clinic Health System - FairmontFairmont, MN
- United Hospital DistrictBlue Earth, MN
Industry payments (Open Payments)
- 2025$167.81 · 11 payments from 8 companies
- 2024$144.31 · 8 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $35.51 | 2 |
| Esperion Therapeutics, Inc. | $32.77 | 2 |
| Xeris Pharmaceuticals, Inc. | $31.50 | 2 |
| Lilly USA, LLC | $15.65 | 1 |
| Takeda Pharmaceuticals U.S.A., Inc. | $14.54 | 1 |
What the 2025 payments were for
- Food and Beverage$167.81 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records