Cathy Tsin, MD
NPI 1275920092 · Pediatric Rheumatology Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cathy Tsin, MD is a Pediatric Rheumatology Physician provider in San Antonio, TX (NPI 1275920092).
Provider details
- NPI number
- 1275920092
- Entity type
- Individual
- Primary specialty
- Pediatric Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- W1516 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
11 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 725 Welch RdPalo Alto, CA 94304-1601Phone: (650) 497-8000
Registry dates
- Enumerated
- 2015-04-20
- Last updated
- 2025-10-01
- Certified
- 2025-10-01
Frequently asked questions
- What is Cathy Tsin's NPI number?
- Cathy Tsin's National Provider Identifier (NPI) is 1275920092, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cathy Tsin's specialty?
- Cathy Tsin is listed in the NPPES registry with a primary specialty of Pediatric Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Cathy Tsin located?
- Cathy Tsin's practice location on file with NPPES is 333 N Santa Rosa, San Antonio, TX 78207-3108.
- What is Cathy Tsin's phone number?
- The practice phone number listed in the NPPES registry for Cathy Tsin is (210) 704-3030.
- Does Cathy Tsin accept Medicare?
- Cathy Tsin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cathy Tsin's NPI active?
- Yes — Cathy Tsin's NPI (1275920092) is active in the NPPES registry as of the last update on 2025-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.