Gregory L. Knutzen, NP
NPI 1871554170ActiveIndividual· Nurse Practitioner, Acute Care· Colton, CA
Nurse Practitioner, Acute Care (NP) with City of Hope Medical Foundation, practicing in Colton, California. Their prescriptions cost Medicare Part D more than their services did: $2,652,117 for 600 claims, against $15,780 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 40 companies reporting payments in 2025, $9,467 in all, mostly food and beverage. Lists Arrowhead Regional Medical Center as a hospital affiliation.
Overview
| NPI | 1871554170 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | Yes |
| NPI issued | Mar 28, 2006 |
| Last updated in NPPES | Nov 9, 2020 |
| Certified by provider | Nov 9, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Acute Care Primary | 363LA2100X | 349887 | CA |
| Nurse Practitioner | 363L00000X | 349887 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 93 |
|---|---|
| Services billed | 357 across 2 procedure codes |
| Paid by Medicare | $15,780 |
Part D prescriptions in 2024
| Prescriptions (claims) | 600 · 753 30-day fills |
|---|---|
| Patients | 103 |
| Total drug cost | $2,652,117 |
| Generic share | 69% of claims |
Education and affiliations
| Graduation year | 1999 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliation
- Arrowhead Regional Medical CenterColton, CA
Industry payments (Open Payments)
- 2025$9,467 · 367 payments from 40 companies
- 2024$8,460 · 318 payments from 43 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $1,141 | 56 |
| Janssen Biotech, Inc. | $775.53 | 27 |
| Pfizer Inc. | $530.09 | 19 |
| Merck Sharp & Dohme LLC | $487.25 | 17 |
| Astellas Pharma US Inc | $462.17 | 20 |
What the 2025 payments were for
- Food and Beverage$8,754 · 358 payments
- Education$712.50 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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