Mariza Diane Oliver, NP
NPI 1477969848ActiveIndividual· Nurse Practitioner, Family· Brownsville, TX
Nurse Practitioner, Family (NP) with Texas Oncology PA, practicing in Brownsville, Texas. Their prescriptions cost Medicare Part D more than their services did: $775,526 for 686 claims, against $44,797 paid for services in 2024. Janssen Biotech, Inc. was the largest of 31 companies reporting payments in 2025, $2,240 in all, mostly food and beverage.
Overview
| NPI | 1477969848 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | No |
| NPI issued | Jul 7, 2014 |
| Last updated in NPPES | Jan 28, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | 648970 | TX |
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 (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 171 |
|---|---|
| Services billed | 3,034 across 31 procedure codes |
| Paid by Medicare | $44,797 |
Part D prescriptions in 2024
| Prescriptions (claims) | 686 · 919 30-day fills |
|---|---|
| Patients | 266 |
| Total drug cost | $775,526 |
| Generic share | 77% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Texas Oncology PAPlano, TX · 1,014 clinicians
Industry payments (Open Payments)
- 2025$2,240 · 55 payments from 31 companies
- 2024$2,129 · 66 payments from 28 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $326.95 | 6 |
| E.R. Squibb & Sons, L.L.C. | $172.61 | 4 |
| Eisai Inc. | $146.15 | 2 |
| Exelixis Inc. | $139.45 | 2 |
| Astrazeneca Pharmaceuticals LP | $126.27 | 2 |
What the 2025 payments were for
- Food and Beverage$2,140 · 54 payments
- Education$99.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 120 family nurse practitioners in Brownsville · All family nurse practitioners in Texas