SOUTH TEXAS ANCILLARY SERVICES, LTD
NPI 1063670289
Family Medicine in San Antonio, TX
About South Texas Ancillary Services, Ltd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SOUTH TEXAS ANCILLARY SERVICES, LTD (NPI 1063670289) is a healthcare organization registered as a family medicine in San Antonio, Texas and active in the NPI registry since May 2008. The organization holds 3 active CLIA laboratory certificates and lists William Gonzaba, President/ceo, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
South Texas Ancillary Services, Ltd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
26Medicare enrollment records show 26 clinicians reassign Medicare billing to South Texas Ancillary Services, Ltd, which bills Medicare for the services they deliver. Of these, 5 practice at this address and 15 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 4
Nearest to this location (20)
See all 26Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA 3
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Accreditation 45D2084739
South Texas Ancillary Services, Ltd Dba Gonzaba Urgent Care Center NW · San Antonio, TXCertificate of Accreditation 45D2084711
South Texas Ancillary Services Gonzaba Urgent Care Center Main · San Antonio, TXCertificate of Accreditation 45D2090993
South Texas Ancillary Services Ltd Dba Gonzaba Urgent Care Center Woodlawn · San Antonio, TXFrequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is South Texas Ancillary Services, Ltd's NPI number?
The NPI number for South Texas Ancillary Services, Ltd is 1063670289. It was assigned to this organization in the NPPES registry on May 23, 2008.
Where is South Texas Ancillary Services, Ltd located?
South Texas Ancillary Services, Ltd is located at 720 Pleasanton Rd, San Antonio, TX 78214. The listed phone number is (210) 921-3800.
What is South Texas Ancillary Services, Ltd's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is South Texas Ancillary Services, Ltd enrolled in Medicare?
Yes. South Texas Ancillary Services, Ltd is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through South Texas Ancillary Services, Ltd?
According to the CMS Revalidation Reassignment List (October 2026 release), 26 clinicians in 4 Medicare specialties reassign their Medicare billing to South Texas Ancillary Services, Ltd. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Nurse Practitioner (22), Internal Medicine (2) and Family Practice (1). Of these, 5 practice at this address and 15 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does South Texas Ancillary Services, Ltd hold CLIA laboratory certificates?
Yes. 3 active CLIA laboratory certificates are associated with this NPI under the federal Clinical Laboratory Improvement Amendments program. The certificates are listed in the CLIA Laboratory Certificates section above.
What insurance does South Texas Ancillary Services, Ltd accept?
Health plans from Harbor Health list South Texas Ancillary Services, Ltd as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for South Texas Ancillary Services, Ltd was last updated on May 23, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# South Texas Ancillary Services, Ltd · NPI 1063670289
Family Medicine organization in San Antonio, Texas. Organization record, active in the CMS NPPES registry since May 23, 2008.
## Identity
- **NPI:** 1063670289 (Entity type: Organization)
- **Enumerated:** May 23, 2008
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **Organization subpart:** No
- **Authorized official:** William Gonzaba, PRESIDENT/CEO
## Practice location
- **Address:** 720 PLEASANTON RD, San Antonio, TX 78214-1306
- **Phone:** (210) 921-3800 · **Fax:** (210) 921-6620
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 26 clinicians in 4 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (22), Internal Medicine (2), Family Practice (1); 5 practice at this address and 15 within 10 miles; [full list](https://npiprofile.com/npi/1063670289/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 23, 2008
- **CLIA laboratory certificates:** 3 on file
---
Source: [NPI Profile](https://npiprofile.com/npi/1063670289) · Data from the CMS NPPES public registry.