Ythanh Nguyen M.D. Inc

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A84989 Issued in CA

Legal business name

YTHANH NGUYEN M.D. INC

Practice address

999 San Bernardino Rd
Upland, CA 91786-4920

Phone

(909) 985-2811

NPI assigned

Nov 27, 2016

Last updated

Feb 1, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Dr. Ythanh Duy Nguyen, M.D.NPI 1255391181

Title

President

Phone

(909) 239-6109

Specialties & licenses 1

Addresses

Locations

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Ythanh Duy Nguyen, MD

  • Internal Medicine Physician
  • Rancho Cucamonga, CA
  • NPI 1255391181
  NPD Authorized official

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

{
    "created_epoch": "1480204800000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1769904000000",
    "number": "1164965018",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "154-A W. FOOTHILL BLVD. BOX 354",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "91786"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "999 SAN BERNARDINO RD",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "917864920",
            "telephone_number": "909-985-2811"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "8235 Rochester Ave",
            "address_purpose": "LOCATION",
            "city": "Rancho Cucamonga",
            "state": "CA",
            "postal_code": "917300718",
            "country_code": "US",
            "telephone_number": "909-484-4900",
            "fax_number": "909-781-2949",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "organization_name": "YTHANH NGUYEN M.D. INC",
        "organizational_subpart": "NO",
        "enumeration_date": "2016-11-27",
        "last_updated": "2026-02-01",
        "certification_date": "2026-02-01",
        "status": "A",
        "authorized_official_last_name": "NGUYEN",
        "authorized_official_first_name": "YTHANH",
        "authorized_official_middle_name": "DUY",
        "authorized_official_title_or_position": "PRESIDENT",
        "authorized_official_telephone_number": "909-239-6109",
        "authorized_official_name_prefix": "Dr.",
        "authorized_official_credential": "M.D."
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A84989",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Angelic Maria Young
• Christalyn Ann Young, DC
• Luke Young I, ACUPUNCTURIST
• Princess Sherie Young, CAMTC
• Sholeh Yousefian, PHARMD
• Laurita Loan Ling Yu, PHARM D
• Jessica Yuan, O.D.
• Yuen-Siang Hung (Upland Dental Implant & Orthodontics)
• Ashley Yuen
• Edward Stephen Yung, M.D.

• Internal Medicine Physician in Upland, CA
• Providers in Upland, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 1, 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.