NPI age
19 years
Enumerated 2006-11-09
● Active
Type 1 · Individual
Gustavo Horacio Day, M.D.
Day is 1 of 1216 internal medicine providers in Dallas and 1 of 12343 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2024-02-08
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 12343 active internal medicine providers in Texas.
NPI age
19 years
↑ 2 yr above median (17 yr)
State licenses
1 state
12% of peers hold multiple states
Subspecialties
0
33% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-11Enumerated in NPPES
2006
2026
Where they practice
Practice location
7777 Forest Ln, Building B, Suite416
Dallas, TX 752302505
Mailing address
Po Box 738305
Dallas, TX 753738305
Specialties
-
Internal Medicine PrimaryA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer,...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (TX) | K1411 | MEDICAL LICENSE |
| 05 (TX) | P00040AM6 | |
| 05 (TX) | 030243201 |
Practice context
Part of a multi-provider practice. 523 other active providers share this practice address in NPPES.
Recently enumerated nearby: 5 new internal medicine providers have been added in Dallas in the last 180 days.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.