NPI age
20 years
Enumerated 2005-10-24
● Active
Type 1 · Individual
Robert A Zajac, MD
Zajac is 1 of 63 internal medicine providers in San Antonio and 1 of 920 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2024-08-08
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 920 active internal medicine providers in Texas.
NPI age
20 years
↑ 3 yr above median (17 yr)
State licenses
1 state
16% of peers hold multiple states
Subspecialties
0
35% of peers hold subspecialties
NPI lifetime · 2005 → 2026
2005-10Enumerated in NPPES
2005
2026
Where they practice
Practice location
150 E Sonterra Blvd, Suite 170
San Antonio, TX 782584098
Mailing address
Po Box 1346
San Antonio, TX 782951346
Specialties
-
Internal Medicine PrimaryAn internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 131416308 |
Practice context
Part of a multi-provider practice. 20 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in San Antonio 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.