Karen Chestnut, FNP
NPI 1144577347ActiveIndividual· Nurse Practitioner, Family· Oxnard, CA
Nurse Practitioner, Family (FNP) with David B. Hammer and 1 other group, practicing in Oxnard, California. In 2024 Medicare paid $56,467 for 273 patients, and Part D covered 485 of their prescriptions, 89% of them generic. Janssen Scientific Affairs, LLC reported $35.63 in payments in 2024, mostly food and beverage. Lists Adventist Health Sierra Vista and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1144577347 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | FNP |
| Sole proprietor | Yes |
| NPI issued | Aug 7, 2012 |
| Last updated in NPPES | Sep 20, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | 22385 | 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 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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 273 |
|---|---|
| Services billed | 762 across 40 procedure codes |
| Paid by Medicare | $56,467 |
Part D prescriptions in 2024
| Prescriptions (claims) | 485 · 893 30-day fills |
|---|---|
| Patients | 164 |
| Total drug cost | $30,609 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical groups
- David B. HammerTempleton, CA · 123 clinicians
- Richard David Griffith MD IncCambria, CA · 3 clinicians
Hospital affiliations
- Adventist Health Sierra VistaSan Luis Obispo, CA
- Adventist Health Twin CitiesTempleton, CA
- French Hospital Medical CenterSan Luis Obispo, CA
Industry payments (Open Payments)
- 2024$35.63 · 1 payment from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Janssen Scientific Affairs, LLC | $35.63 | 1 |
What the 2024 payments were for
- Food and Beverage$35.63 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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