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

Gustavo Horacio Day, MD

Individual provider Internal Medicine Physician · NPI 1538239173

Gustavo Horacio Day, MD is an Internal Medicine in Dallas, Texas. Qualified in 1990, 36 years ago. Practices as a sole proprietor. Licensed in Texas.

Years since qualifying
36
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

7777 Forest Ln Bldg B SUITE416
Dallas, TX 75230-2505
Phone: (972) 566-6764
Fax: (972) 566-6968
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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 K1411 (TX)

Record details

NPI number1538239173
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedNovember 9, 2006
Last updated in NPPESMay 18, 2026
Certification dateMay 18, 2026
Mailing addressPo Box 738305, Dallas, TX 75373-8305

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1990 (36 years in practice)
Accepts Medicare assignment Not indicated

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