Gregory Robert Cook Jr., APRN, CNP
NPI 1053964395ActiveIndividual· Nurse Practitioner· Chicago, IL
Nurse Practitioner (APRN, CNP) with Northwestern Medical Faculty Foundation, practicing in Chicago, Illinois. Their prescriptions cost Medicare Part D more than their services did: $245,495 for 743 claims, against $40,571 paid for services in 2024. Insmed, Inc. was the largest of 3 companies reporting payments in 2025, $244.19 in all, mostly food and beverage. Lists Northwestern Lake Forest Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1053964395 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | APRN, CNP |
| Sole proprietor | No |
| NPI issued | Jul 16, 2019 |
| Last updated in NPPES | Sep 19, 2023 |
| Certified by provider | Sep 19, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 209027656 | IL |
| Nurse Practitioner, Family | 363LF0000X | 11003002 | FL |
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 (FL); Practitioner - Nurse Practitioner (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 373 |
|---|---|
| Services billed | 472 across 8 procedure codes |
| Paid by Medicare | $40,571 |
Part D prescriptions in 2024
| Prescriptions (claims) | 743 · 1,013 30-day fills |
|---|---|
| Patients | 239 |
| Total drug cost | $245,495 |
| Generic share | 42% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 clinicians
Hospital affiliations
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Memorial HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
Other facilities
- Shirley Ryan AbilitylabInpatient rehabilitation facility · Chicago, IL
Industry payments (Open Payments)
- 2025$244.19 · 10 payments from 3 companies
- 2024$263.22 · 25 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Insmed, Inc. | $100.53 | 4 |
| Glaxosmithkline, LLC. | $80.66 | 3 |
| Astrazeneca Pharmaceuticals LP | $63.00 | 3 |
What the 2025 payments were for
- Food and Beverage$244.19 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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