John T Tsai, M.D.

Primary specialty

Pediatric Adolescent Medicine PhysicianTaxonomy code 2080A0000X

License

0101238865 Issued in VA

Practice address

3650 Joseph Siewick Dr
Suite 101
Fairfax, VA 22033-1710

Phone

(703) 391-0900

Fax

(703) 391-2919

NPI assigned

Dec 2, 2005

Sex

Male

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)

Enrolled

Credentials

Doctor of Medicine

State licenses

Interoperability endpoints

• Direct secure messaging: john.tsai@ffxpeds.eclinicaldirectplus.com

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

{
    "created_epoch": "1133481600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1376527366",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3650 JOSEPH SIEWICK DR",
            "address_2": "SUITE 101",
            "city": "FAIRFAX",
            "state": "VA",
            "postal_code": "220331710",
            "telephone_number": "703-391-0900",
            "fax_number": "703-391-2919"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3650 JOSEPH SIEWICK DR",
            "address_2": "SUITE 101",
            "city": "FAIRFAX",
            "state": "VA",
            "postal_code": "220331710",
            "telephone_number": "703-391-0900",
            "fax_number": "703-391-2919"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TSAI",
        "first_name": "JOHN",
        "middle_name": "T",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-12-02",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080A0000X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Adolescent Medicine",
            "state": "VA",
            "license": "0101238865",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Trusted Doctors LLC
• Trusted Doctors LLC
• Danny Truvan, D.D.S.
• James M Truxell, M.DIV.
• Jeffrey Tsai, PT
• Christopher W Tsang, M.D.
• Maria Tsao, M.D.
• Evangelia E Tsapos, DO
• Beth E Tschopp, LCSW, MSW, MPP
• Esther Tse

• Pediatric Adolescent Medicine Physician in Fairfax, VA
• Providers in Fairfax, VA by specialty
• Pediatric Adolescent Medicine Physician in Virginia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.