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

Dr. Melissa Martinez-Diaz, MD

Individual provider Internal Medicine Physician · NPI 1255350427

Dr. Melissa Martinez-Diaz, MD is an Internal Medicine in San Antonio, Texas. Qualified in 2000, 26 years ago. Practices with Gmg Health Systems Associates PA, a 116-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
26
Licensed in
TX
In the registry since
2006
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

720 Pleasanton Rd
San Antonio, TX 78214-1343
Phone: (210) 921-3800
Fax: (210) 334-2838
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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 M0812 (TX)

Record details

NPI number1255350427
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 19, 2006
Last updated in NPPESJanuary 7, 2022
Certification dateJanuary 7, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2000 (26 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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