NPI age
19 years
Enumerated 2007-01-12
● Active
Type 1 · Individual
Jeffrey Stewart Hallett, M.D.
Hallett is 1 of 10 allergy & immunology providers in Round Rock and 1 of 506 in Texas.
Primary specialty
Allergy & Immunology
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2007-07-08
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 506 active allergy & immunology providers in Texas.
NPI age
19 years
≈ at median (19 yr)
State licenses
1 state
9% of peers hold multiple states
Subspecialties
0
28% of peers hold subspecialties
NPI lifetime · 2007 → 2026
2007-01Enumerated in NPPES
2007
2026
Where they practice
Practice location
16000 Park Valley Drive, Suite #130
Round Rock, TX 786814009
Mailing address
16000 Park Valley Drive, Suite #130
Round Rock, TX 786814009
Specialties
-
Allergy & Immunology PrimaryAn allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (TX) | 00DU91 | BLUE CROSS BLUE SHIELD |
Practice context
Solo or small practice. No other active providers share this practice address in NPPES. This provider is listed as a sole proprietor.
Provyx · Custom healthcare lists
Need all 506 Allergy & Immunology providers in Texas?
Get the full list as a CSV with verified work emails, direct phones, and LinkedIn URLs.
Request a quote →How to verify this provider
- 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.