CATHY MEI TSIN MD
NPI 1275920092
Pediatrics - Pediatric Rheumatology in San Antonio, TX
About Cathy Mei Tsin Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CATHY MEI TSIN MD (NPI 1275920092) is an individual pediatric rheumatology provider in San Antonio, Texas, licensed in Texas (W1516) and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS, maintains a secondary practice location in Palo Alto, and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Cathy Mei Tsin Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Cathy Tsin reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Antonio, TX 78207
- Reassigned Medicare billing, Texas enrollment
- 453 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN ANTONIO, TX 78207
SAN ANTONIO, TX 78207
SAN ANTONIO, TX 78207
SAN ANTONIO, TX 78207
Frequently 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 Cathy Tsin's NPI number?
The NPI number for Cathy Tsin is 1275920092. It was assigned to this individual provider in the NPPES registry on April 20, 2015.
Where is Cathy Tsin located?
Cathy Tsin practices at 333 N Santa Rosa, San Antonio, TX 78207. The listed phone number is (210) 704-3030.
What is Cathy Tsin's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Rheumatology, with taxonomy code 2080P0216X.
Is Cathy Tsin enrolled in Medicare?
Yes. Cathy Tsin is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Cathy Tsin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cathy Tsin reassigns Medicare benefits to 2 organizations: Baylor College Of Medicine (San Antonio, TX) and Lpch Medical Group Div Of Lucile (Palo Alto, CA). Each 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 Cathy Tsin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Cathy Tsin accept?
Health plans from Blue Cross and Blue Shield of Texas and Oscar Insurance Company list Cathy Tsin 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 Cathy Tsin was last updated on October 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months 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.
# Cathy Mei Tsin, MD · NPI 1275920092
Pediatric Rheumatology physician in San Antonio, Texas. Individual provider, active in the CMS NPPES registry since April 20, 2015.
## Identity
- **NPI:** 1275920092 (Entity type: Individual)
- **Enumerated:** April 20, 2015
- **Primary specialty:** Pediatrics - Pediatric Rheumatology · taxonomy 2080P0216X
- **State license:** W1516 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 333 N SANTA ROSA, San Antonio, TX 78207-3108
- **Phone:** (210) 704-3030
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Baylor College Of Medicine (NPI 1285079764, San Antonio, TX); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** October 1, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1275920092) · Data from the CMS NPPES public registry.