NPI age
19 years
Enumerated 2006-09-25
● Active
Type 1 · Individual
DR. Stephen Derdak, D.O.
Derdak is 1 of 120 internal medicine providers in San Antonio and 1 of 1318 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2024-05-14
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 1318 active internal medicine providers in Texas.
NPI age
19 years
≈ at median (18 yr)
State licenses
1 state
15% of peers hold multiple states
Subspecialties
0
57% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-09Enumerated in NPPES
2006
2026
Where they practice
Practice location
8300 Floyd Curl Dr
San Antonio, TX 782293931
Mailing address
8300 Floyd Curl Dr # Mc8308
San Antonio, TX 782293931
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
1100 Wilford Hall Loop Bldg 4554
Lackland Afb, TX 782365638
Location 3
4502 Medical Dr
San Antonio, TX 782294402
Specialties
-
Internal Medicine PrimaryAn internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 148199604 |
Practice context
Part of a multi-provider practice. 240 other active providers share this practice address in NPPES.
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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.
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