Marquita Walker, PMHNP-BC, FNP-C
NPI 1811360662ActiveIndividual· Nurse Practitioner, Psych/Mental Health· Greenville, TX
Nurse Practitioner, Psych/Mental Health (PMHNP-BC, FNP-C) with Minuteclinic Diagnostic of Texas PLLC and 1 other group, practicing in Greenville, Texas. Their prescriptions cost Medicare Part D more than their services did: $544,604 for 2,397 claims, against $15,729 paid for services in 2024. E.R. Squibb & Sons, L.L.C. was the largest of 14 companies reporting payments in 2025, $2,092 in all, mostly food and beverage.
Overview
| NPI | 1811360662 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PMHNP-BC, FNP-C |
| Sole proprietor | No |
| NPI issued | Nov 2, 2015 |
| Last updated in NPPES | Apr 16, 2026 |
| Certified by provider | Apr 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Psych/Mental Health Primary | 363LP0808X | AP131035 | TX |
| Nurse Practitioner, Family | 363LF0000X | AP131035 | 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 | 54 |
|---|---|
| Services billed | 270 across 13 procedure codes |
| Paid by Medicare | $15,729 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,397 · 2,920 30-day fills |
|---|---|
| Patients | 160 |
| Total drug cost | $544,604 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical groups
- Minuteclinic Diagnostic of Texas PLLCFlower Mound, TX · 253 clinicians
- Satish Narayan MD PAGreenville, TX · 12 clinicians
Industry payments (Open Payments)
- 2025$2,092 · 130 payments from 14 companies
- 2024$1,300 · 76 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. | $438.50 | 21 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $318.65 | 21 |
| Otsuka America Pharmaceutical, Inc. | $252.31 | 20 |
| Neurocrine Biosciences, Inc. | $205.54 | 7 |
| Vanda Pharmaceuticals Inc. | $196.02 | 16 |
What the 2025 payments were for
- Food and Beverage$2,092 · 130 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 22 psychiatric nurse practitioners in Greenville · All psychiatric nurse practitioners in Texas