Clarrisa C. Hamann, APN-CNP
NPI 1255542718ActiveIndividual· Nurse Practitioner· Highland Park, IL
Nurse Practitioner (APN-CNP) with Endeavor Health Medical Group, practicing in Highland Park, Illinois. Their prescriptions cost Medicare Part D more than their services did: $452,357 for 1,508 claims, against $21,244 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 20 companies reporting payments in 2025, $2,717 in all, mostly food and beverage. Lists Northshore University Healthsystem - Evanston Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1255542718 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | APN-CNP |
| Sole proprietor | No |
| NPI issued | May 25, 2007 |
| Last updated in NPPES | Jun 18, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 209-004281 | IL |
| Registered Nurse | 163W00000X | 041271088 | IL |
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 (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 207 |
|---|---|
| Services billed | 319 across 11 procedure codes |
| Paid by Medicare | $21,244 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,508 · 3,872 30-day fills |
|---|---|
| Patients | 329 |
| Total drug cost | $452,357 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Swedish HospitalChicago, IL
Industry payments (Open Payments)
- 2025$2,717 · 87 payments from 20 companies
- 2024$2,173 · 66 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $479.31 | 18 |
| Novartis Pharmaceuticals Corporation | $447.02 | 17 |
| Aop Health US, LLC | $391.35 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $358.03 | 12 |
| Bridgebio Pharma, Inc. | $194.00 | 9 |
What the 2025 payments were for
- Food and Beverage$2,717 · 87 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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