Cassandra Hartwig, NP
NPI 1215476163ActiveIndividual· Nurse Practitioner· Waterloo, WI
Nurse Practitioner (NP) with Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc., practicing in Waterloo, Wisconsin. 149 Medicare patients in 2024, $35,157 paid; all of their 97 Part D prescriptions were generic. Organogenesis Inc. was the largest of 3 companies reporting payments in 2025, $1,646 in all, mostly travel and lodging. Lists Aspirus Eagle River Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1215476163 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | No |
| NPI issued | Feb 13, 2017 |
| Last updated in NPPES | Jun 23, 2023 |
| Certified by provider | Jun 23, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 7517 | WI |
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 (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 149 |
|---|---|
| Services billed | 874 across 30 procedure codes |
| Paid by Medicare | $35,157 |
Part D prescriptions in 2024
| Prescriptions (claims) | 97 · 97 30-day fills |
|---|---|
| Patients | 60 |
| Total drug cost | $862.62 |
| Generic share | 100% of claims |
Education and affiliations
| Graduation year | 2016 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.Rhinelander, WI · 574 clinicians
Hospital affiliations
- Aspirus Eagle River HospitalEagle River, WI
- Aspirus Rhinelander HospitalRhinelander, WI
- Aspirus Tomahawk HospitalTomahawk, WI
- Howard Young Medical CenterWoodruff, WI
- Marshfield Medical Center - MinocquaMinocqua, WI
Industry payments (Open Payments)
- 2025$1,646 · 11 payments from 3 companies
- 2024$21.40 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Organogenesis Inc. | $1,540 | 9 |
| Smith+nephew, Inc. | $89.16 | 1 |
| Urgo Medical North America, LLC | $16.87 | 1 |
What the 2025 payments were for
- Travel and Lodging$1,347 · 4 payments
- Food and Beverage$299.41 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records