Ryan Alyson-Yao Tiu

Primary specialty

Student in an Organized Health Care Education/Training ProgramTaxonomy code 390200000X

Practice address

UCSF Department of Medicine, 505 Parnassus Ave
M1480
San Francisco, CA 94143

Phone

(415) 476-1528

NPI assigned

Apr 10, 2026

Last updated

Apr 10, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

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

{
    "created_epoch": "1775779200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775779200000",
    "number": "1043153547",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE",
            "address_2": "M1480",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "94143"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE",
            "address_2": "M1480",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "94143",
            "telephone_number": "415-476-1528"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TIU",
        "first_name": "RYAN",
        "middle_name": "ALYSON-YAO",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2026-04-10",
        "last_updated": "2026-04-10",
        "certification_date": "2026-04-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "NU",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kellen Tisinger
• Geoffrey Huang Tison, MD MPH
• Alisa Title
• Robin Louise Tittle, MD
• Erron Wilcox Titus, MD, PHD
• Andrea Beth Tivers
• Immanuel Aditya Tjahjadi
• Nathasa Tjahjadi
• Tina Tjahjadi
• Katherine Tjhin-Keophiphat

• Student in an Organized Health Care Education/Training Program in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Student in an Organized Health Care Education/Training Program in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 10, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.