Cathy Mei Tsin, MD

Primary specialty

Pediatric Rheumatology PhysicianTaxonomy code 2080P0216X

License

W1516 Issued in TX

Practice address

333 N Santa Rosa
San Antonio, TX 78207-3108

Phone

(210) 704-3030

NPI assigned

Apr 20, 2015

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 4

Addresses

Medicare fee-for-service enrollment

Enrolled in CA, TX2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Pediatric MedicineAlso: Rheumatology

Education

Other, 2015

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ctsin637823@christushealth.direct-ci.net

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Baylor College of Medicine

  • Pediatrics Physician
  • San Antonio, TX
  • NPI 1285079764
  Medicare reassignment NPD
• LPCH Medical Group Div of Lucile

  • Children's Hospital
  • Palo Alto, CA
  • NPI 1417907940

  Pediatrics

  Medicare reassignment NPD

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1429488000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759276800000",
    "number": "1275920092",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "315 N SAN SABA STE 1135",
            "city": "SAN ANTONIO",
            "state": "TX",
            "postal_code": "782073255",
            "telephone_number": "210-704-4275"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "333 N SANTA ROSA",
            "city": "SAN ANTONIO",
            "state": "TX",
            "postal_code": "782073108",
            "telephone_number": "210-704-3030"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "725 Welch Rd",
            "address_purpose": "LOCATION",
            "city": "Palo Alto",
            "state": "CA",
            "postal_code": "943041601",
            "country_code": "US",
            "telephone_number": "650-497-8000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "TSIN",
        "first_name": "CATHY",
        "middle_name": "MEI",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2015-04-20",
        "last_updated": "2025-10-01",
        "certification_date": "2025-10-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "TX",
            "license": "W1516",
            "primary": false
        },
        {
            "code": "2080P0216X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Rheumatology",
            "state": "CA",
            "license": "A168568",
            "primary": false
        },
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "CA",
            "license": "A168568",
            "primary": false
        },
        {
            "code": "2080P0216X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Rheumatology",
            "state": "TX",
            "license": "W1516",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Clevert Hugo Tseng, MD
• Kelsey Tseng, PA
• Timothy Tseng, M.D.
• Yaochung Tseng, ACUPUNCTURIST
• Joel Tsevat, M.D.
• Jessica Tsing
• TSK Medgroup
• Marjorie Tsutsui, DDS
• Olga Tsvetkova
• Marina E Tsyura, SLP

• Pediatric Rheumatology Physician in San Antonio, TX
• Providers in San Antonio, TX by specialty
• Pediatric Rheumatology Physician in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 1, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.