Marlene Diaz, M.D.
NPI 1427166644ActiveIndividual· Obstetrics & Gynecology, Gynecology· Plano, TX
Obstetrics & Gynecology, Gynecology (M.D.) in Plano, Texas, trained at University of Texas Southwestern Medical School at Dallas (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $28,891 for 501 claims, against $8,740 paid for services in 2024. Astellas Pharma US Inc was the largest of 5 companies reporting payments in 2025, $140.47 in all, mostly food and beverage.
Overview
| NPI | 1427166644 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 28, 2006 |
| Last updated in NPPES | Sep 1, 2022 |
| Certified by provider | Sep 1, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology, Gynecology Primary | 207VG0400X | J1971 | TX |
| Specialist | 174400000X | J1971 | 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 - Obstetrics/Gynecology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 68 |
|---|---|
| Services billed | 203 across 16 procedure codes |
| Paid by Medicare | $8,740 |
Part D prescriptions in 2024
| Prescriptions (claims) | 501 · 1,253 30-day fills |
|---|---|
| Patients | 76 |
| Total drug cost | $28,891 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Texas Southwestern Medical School at Dallas |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Obstetrics/Gynecology |
| Telehealth | Offers telehealth |
Hospital affiliations
- Medical Center of McKinneyMcKinney, TX
- Medical City PlanoPlano, TX
Industry payments (Open Payments)
- 2025$140.47 · 8 payments from 5 companies
- 2024$194.65 · 11 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astellas Pharma US Inc | $67.84 | 4 |
| Hologic Sales and Service, LLC | $23.90 | 1 |
| Mayne Pharma Commercial LLC | $17.97 | 1 |
| Exeltis, USA Inc. | $15.82 | 1 |
| Exact Sciences Corporation | $14.94 | 1 |
What the 2025 payments were for
- Food and Beverage$140.47 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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