Guillermo Lazo-Diaz, MD
NPI 1760421101ActiveIndividual· Internal Medicine, Medical Oncology· McAllen, TX
Internal Medicine, Medical Oncology (MD) with Texas Oncology PA, practicing in McAllen, Texas. Their prescriptions cost Medicare Part D more than their services did: $4,640,897 for 1,270 claims, against $618,390 paid for services in 2024. Incyte Corporation was the largest of 24 companies reporting payments in 2025, $2,323 in all, mostly food and beverage. Lists Doctors Hosptal at Renaissance and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1760421101 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 4, 2006 |
| Last updated in NPPES | Dec 11, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | L0370 | TX |
| Internal Medicine, Hematology & Oncology | 207RH0003X | L0370 | TX |
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 - Medical Oncology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 352 |
|---|---|
| Services billed | 51,727 across 129 procedure codes |
| Paid by Medicare | $618,390 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,270 · 1,869 30-day fills |
|---|---|
| Patients | 276 |
| Total drug cost | $4,640,897 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 1993 |
|---|---|
| Medicare specialty | Medical Oncology |
| Secondary specialties | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- Texas Oncology PAPlano, TX · 1,014 clinicians
Hospital affiliations
- Doctors Hosptal at RenaissanceEdinburg, TX
- Rio Grande Regional HospitalMcAllen, TX
- South Texas Health SystemEdinburg, TX
Industry payments (Open Payments)
- 2025$2,323 · 55 payments from 24 companies
- 2024$442.17 · 15 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Incyte Corporation | $860.00 | 1 |
| Abbvie Inc. | $198.20 | 4 |
| Novartis Pharmaceuticals Corporation | $152.61 | 8 |
| Boston Scientific Corporation | $137.83 | 1 |
| Exelixis Inc. | $124.36 | 2 |
What the 2025 payments were for
- Food and Beverage$1,332 · 52 payments
- Consulting Fee$860.00 · 1 payment
- Education$130.60 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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