Christopher K Tsai M D Inc.

Primary specialty

Urology PhysicianTaxonomy code 208800000X

License

A54843 Issued in CA

Legal business name

CHRISTOPHER K TSAI M D INC.

Practice address

1175 E Arrow Hwy
Suite E
Upland, CA 91786-5525

Phone

(909) 985-9737

Fax

(909) 981-1203

NPI assigned

Aug 22, 2007

Organization subpart

No

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

Authorized official

Name

John U Alvarez

Title

Billing Manager

Phone

(909) 985-9737

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Enrollment records 1

Practitioners 3

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

• Victor Choy Ching, MD

  • Urology Physician
  • Upland, CA
  • NPI 1356334437
  Medicare reassignment NPD
• Christopher K Tsai, MD

  • Urology Physician
  • Upland, CA
  • NPI 1457344483
  Medicare reassignment NPD
• Isaac Laurence Kelly, M.D.

  • Urology Physician
  • Upland, CA
  • NPI 1083057525
  NPD

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

{
    "created_epoch": "1187740800000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1788220800000",
    "number": "1760675763",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1175 E ARROW HWY",
            "address_2": "SUITE E",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "917865525",
            "telephone_number": "909-985-9737",
            "fax_number": "909-981-1203"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1175 E ARROW HWY",
            "address_2": "SUITE E",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "917865525",
            "telephone_number": "909-985-9737",
            "fax_number": "909-981-1203"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "CHRISTOPHER K TSAI M D INC.",
        "organizational_subpart": "NO",
        "enumeration_date": "2007-08-22",
        "last_updated": "2026-09-01",
        "certification_date": "2026-09-01",
        "status": "A",
        "authorized_official_last_name": "ALVAREZ",
        "authorized_official_first_name": "JOHN",
        "authorized_official_middle_name": "U",
        "authorized_official_title_or_position": "BILLING MANAGER",
        "authorized_official_telephone_number": "909-985-9737"
    },
    "taxonomies": [
        {
            "code": "208800000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Urology",
            "state": "CA",
            "license": "A54843",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Farjahan Johir Chowdhury, MD
• Loren Chris, M.S. CCC-SLP
• Christian Heritage Care Center
• Julia Christianson
• Christine Denstaedt
• Caleb Chu, M.D.
• Frederick Chu, PSYD
• Steve Chu, D.D.S.
• Vicky Chii Chu, PHARM.D.
• Mary Chun, R.N.

• Urology Physician in Upland, CA
• Providers in Upland, CA by specialty
• Urology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 1, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.