NPI age
18 years
Enumerated 2007-09-24
● Active
Type 1 · Individual
Mark Hassler
Hassler is 1 of 27 nurse practitioner providers in Fort Sam Houston and 1 of 3226 in Texas.
Primary specialty
Nurse Practitioner
Licensed in
TN
1 state
Status
Active
No deactivations on record
Last NPPES update
2010-10-08
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 3226 active nurse practitioner providers in Texas.
NPI age
18 years
↑ 12 yr above median (6 yr)
State licenses
1 state
6% of peers hold multiple states
Subspecialties
0
30% of peers hold subspecialties
NPI lifetime · 2007 → 2026
2007-09Enumerated in NPPES
2007
2026
Where they practice
Practice location
3851 Roger Brooke Dr, Brooke Army Medical Center
Fort Sam Houston, TX 782344501
Mailing address
3851 Roger Brooke Dr, Brooke Army Medical Center
Fort Sam Houston, TX 782344501
Specialties
-
Nurse Practitioner PrimaryDefinition to come...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (TN) | VAD000 | UPIN |
Practice context
Part of a multi-provider practice. 345 other active providers share this practice address in NPPES.
Provyx · Custom healthcare lists
Need all 3226 Nurse Practitioner providers in Texas?
Provyx verifies the list to your scope. Business emails and direct lines are looked up at delivery, validated, and not stored.
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.