Theresa Thanh Ngoc Nguyen, MD, Inc.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A61129 Issued in CA

Legal business name

THERESA THANH NGOC NGUYEN, MD, INC.

Practice address

5030 Westminster Ave
Santa Ana, CA 92703-1151

Phone

(714) 775-8090

Fax

(657) 251-0494

NPI assigned

Oct 31, 2011

Organization subpart

No

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

Authorized official

Name

Theresa Thanh Ngoc Nguyen, MDNPI 1003893801

Title

Physician in Charge

Phone

(714) 775-8090

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Enrollment records 1

These CMS records do not include an NPI. They are shown because their name and street address match this provider’s.

CLIA laboratory certificates

Tax ID family

Theresa Thanh Ngoc Nguye2 organizations share this tax ID, including this one

Other organizations with this tax ID 1

Organizations that report the same tax identification number in the National Provider Directory.

• Theresa Thanh Ngoc Nguyen, MD, Inc.

  • Medical Specialty Clinic/Center
  • Westminster, CA
  • NPI 1386863454
  NPD tax ID

Locations

Practitioners 3

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

• Theresa Thanh Ngoc Nguyen, M.D.

  • Internal Medicine Physician
  • Santa Ana, CA
  • NPI 1003893801
  Medicare reassignment Care Compare group NPD Authorized official
• Thai Dinh Nguyen, M.D.

  • Internal Medicine Physician
  • Santa Ana, CA
  • NPI 1467547042
  Medicare reassignment Care Compare group NPD
• Tam Thi Minh Nguyen

  • Women's Health Nurse Practitioner
  • Santa Ana, CA
  • NPI 1407562853
  NPD

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

{
    "created_epoch": "1320019200000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1784505600000",
    "number": "1750667192",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5030 WESTMINSTER AVE",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927031151",
            "telephone_number": "714-775-8090",
            "fax_number": "657-251-0494"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5030 WESTMINSTER AVE",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927031151",
            "telephone_number": "714-775-8090",
            "fax_number": "657-251-0494"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "THERESA THANH NGOC NGUYEN, MD, INC.",
        "organizational_subpart": "NO",
        "enumeration_date": "2011-10-31",
        "last_updated": "2026-07-20",
        "certification_date": "2026-07-20",
        "status": "A",
        "authorized_official_last_name": "NGUYEN",
        "authorized_official_first_name": "THERESA THANH",
        "authorized_official_middle_name": "NGOC",
        "authorized_official_title_or_position": "PHYSICIAN IN CHARGE",
        "authorized_official_telephone_number": "714-775-8090",
        "authorized_official_credential": "MD"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A61129",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Internal Medicine Physician in Santa Ana, CA
• Providers in Santa Ana, 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 Jul 20, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• 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.