TONY N TSEN MD
NPI 1043337074
Internal Medicine - Gastroenterology in Seguin, TX
About Tony N Tsen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TONY N TSEN MD (NPI 1043337074) is a healthcare organization registered as a gastroenterology in Seguin, Texas and active in the NPI registry since March 2007. The organization holds a CLIA Waiver certificate valid through September 12, 2028 and lists Tony N Tsen, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 4
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Tony N Tsen Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by December 31, 2026
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Tony N Tsen MD, which bills Medicare for the services this clinician delivers.
Clinician (1)
Source: 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
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 Waiver 45D0979144
Dr Tony Tsen Southwest Gastroenterology PA · Seguin, 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 Southwest Gastoenterology PA's NPI number?
The NPI number for Southwest Gastoenterology PA is 1043337074. It was assigned to this organization in the NPPES registry on March 23, 2007. The provider is doing business as Tony N Tsen MD.
Where is Southwest Gastoenterology PA located?
Southwest Gastoenterology PA is located at 911 S State Hwy 123 Bypass, Seguin, TX 78155. The listed phone number is (830) 372-9042.
What is Southwest Gastoenterology PA's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Southwest Gastoenterology PA enrolled in Medicare?
Yes. Southwest Gastoenterology PA is registered in the Medicare PECOS enrollment system.
When is Southwest Gastoenterology PA's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (Texas, Clinic/Group Practice) is due for revalidation by December 31, 2026. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Southwest Gastoenterology PA?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Gastroenterology) reassigns their Medicare billing to Southwest Gastoenterology PA. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Southwest Gastoenterology PA hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 45D0979144) is associated with this NPI, valid through September 12, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Southwest Gastoenterology PA was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Tony N Tsen Md · NPI 1043337074
Gastroenterology organization in Seguin, Texas. Organization record, active in the CMS NPPES registry since March 23, 2007.
## Identity
- **NPI:** 1043337074 (Entity type: Organization)
- **Enumerated:** March 23, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Legal business name:** Southwest Gastoenterology Pa
- **Organization subpart:** No
- **Authorized official:** Tony Tsen, PRESIDENT
## Practice location
- **Address:** 911 S STATE HWY 123 BYPASS, Seguin, TX 78155-9754
- **Phone:** (830) 372-9042 · **Fax:** (830) 372-2391
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** December 31, 2026 (Non-DME Part B, Texas, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 1 clinician (Gastroenterology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 7, 2023
- **Other identifiers:** Other F58934 (TX); Medicaid 131242306 (TX); Other J8152 (TX); and 1 more
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1043337074) · Data from the CMS NPPES public registry.