Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Guillermo Madero, MD

Individual provider Internal Medicine Physician · NPI 1235384439

Guillermo Madero, MD is an Internal Medicine in San Antonio, Texas. Qualified in 2004, 22 years ago. Practices with Gmg Health Systems Associates PA, a 116-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
22
Licensed in
TX
In the registry since
2008
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

1499 Hillcrest Dr
San Antonio, TX 78228-3900
Phone: (210) 921-3800
Fax: (210) 334-2861
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence Q0968 (TX)

Record details

NPI number1235384439
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 2, 2008
Last updated in NPPESApril 8, 2024
Certification dateApril 8, 2024

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2004 (22 years in practice)
Group practice Gmg Health Systems Associates Pa — 116 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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