Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Guillermo Lazo-Diaz, MD

Individual provider Medical Oncology Physician · NPI 1760421101

Dr. Guillermo Lazo-Diaz, MD is a Medical Oncology in McAllen, Texas. Qualified in 1993, 33 years ago. Practices with Texas Oncology PA, a 1,005-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Texas.

Years since qualifying
33
Licensed in
TX
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1901 S 2nd St
McAllen, TX 78503-1271
Phone: (956) 687-5150
Fax: (956) 687-9546
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence L0370 (TX)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence L0370 (TX)

Record details

NPI number1760421101
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 4, 2006
Last updated in NPPESDecember 11, 2008

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 1993 (33 years in practice)
Group practice Texas Oncology Pa — 1005 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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