Tammy Chen, NURSE PRACTITIONER
NPI 1255792875ActiveIndividual· Nurse Practitioner, Adult Health· Fullerton, CA
Nurse Practitioner, Adult Health (NURSE PRACTITIONER) with Hoag Clinic, practicing in Fullerton, California. Their prescriptions cost Medicare Part D more than their services did: $33,866 for 1,735 claims, against $12,948 paid for services in 2024. Abbvie Inc. was the largest of 2 companies reporting payments in 2025, $92.87 in all, mostly food and beverage. Lists Hoag Memorial Hospital Presbyterian as a hospital affiliation.
Overview
| NPI | 1255792875 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NURSE PRACTITIONER |
| Sole proprietor | Yes |
| NPI issued | Mar 9, 2016 |
| Last updated in NPPES | Dec 19, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Adult Health Primary | 363LA2200X | NP95003688 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 44 |
|---|---|
| Services billed | 450 across 12 procedure codes |
| Paid by Medicare | $12,948 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,735 · 2,123 30-day fills |
|---|---|
| Patients | 207 |
| Total drug cost | $33,866 |
| Generic share | 98% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Hoag ClinicNewport Beach, CA · 460 clinicians
Hospital affiliation
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
Industry payments (Open Payments)
- 2025$92.87 · 3 payments from 2 companies
- 2024$16.21 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $61.71 | 2 |
| Aimmune Therapeutics, Inc. | $31.16 | 1 |
What the 2025 payments were for
- Food and Beverage$92.87 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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