Guillermo Lazo-Diaz, MD
NPI 1760421101 · Medical Oncology Physician · Mcallen, TX
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guillermo Lazo-Diaz, MD is a Medical Oncology Physician provider in Mcallen, TX (NPI 1760421101).
Provider details
- NPI number
- 1760421101
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- L0370 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,582 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 710 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 689 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 661 | $10 |
| Lactate Dehydrogenase (enzyme) Level83615 | 604 | $6 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 373 | $121 |
| Ferritin (blood Protein) Level82728 | 203 | $13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 211 | 53 |
| Lenalidomidebrand: Revlimid | 68 | 16 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 67 | 23 |
| Hydroxyurea | 66 | 16 |
| Acyclovir | 61 | 11 |
| Dexamethasone | 55 | 20 |
| Prednisone | 48 | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$442 across 15 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-04
- Last updated
- 2008-12-11
Frequently asked questions
- What is Guillermo Lazo-Diaz's NPI number?
- Guillermo Lazo-Diaz's National Provider Identifier (NPI) is 1760421101, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Lazo-Diaz's specialty?
- Guillermo Lazo-Diaz is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Guillermo Lazo-Diaz located?
- Guillermo Lazo-Diaz's practice location on file with NPPES is 1901 S 2nd St, Mcallen, TX 78503-1271.
- What is Guillermo Lazo-Diaz's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Lazo-Diaz is (956) 687-5150.
- Does Guillermo Lazo-Diaz accept Medicare?
- Guillermo Lazo-Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guillermo Lazo-Diaz's NPI active?
- Yes — Guillermo Lazo-Diaz's NPI (1760421101) is active in the NPPES registry as of the last update on 2008-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.