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

Ralph A Defronzo, MD

Individual provider Endocrinology, Diabetes & Metabolism Physician · NPI 1851408843

Ralph A Defronzo, MD is an Endocrinology, Diabetes & Metabolism Physician in San Antonio, Texas. Licensed in Texas. Registered with an NPI since 2006.

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

701 S Zarzamora St
San Antonio, TX 78207-5209
Phone: (210) 358-7500
Fax: (210) 358-7515
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Endocrinology, Diabetes & Metabolism Physician (primary) Taxonomy 207RE0101X · Licence H7531 (TX)

Record details

NPI number1851408843
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 24, 2006
Last updated in NPPESMay 2, 2011

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