Theresa Thanh Ngoc Nguyen, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A61129 Issued in CA

Practice address

5030 Westminster Ave
Santa Ana, CA 92703-1151

Phone

(714) 775-8090

Fax

(657) 251-0494

NPI assigned

Dec 22, 2005

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

Other names 1

• Thanh Ngoc Nguyen Other name

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Internal Medicine

Education

University of California, San Diego School of Medicine, 1995

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Theresa Thanh Ngoc Nguyen MD IncGroup PAC ID 8820250293, 2 clinicians

Family Choice Aco IncGroup PAC ID 7719379395, 60 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Theresa Thanh Ngoc Nguyen, MD, Inc.

  • Internal Medicine Physician
  • Santa Ana, CA
  • NPI 1750667192
  Medicare reassignment Care Compare group NPD Authorized official
• Family Choice Aco Inc

  • Internal Medicine Physician
  • Westminster, CA
  • NPI 1396416863
  Medicare reassignment Care Compare group NPD
• Theresa Thanh Ngoc Nguyen, MD, Inc.

  • Medical Specialty Clinic/Center
  • Westminster, CA
  • NPI 1386863454
  NPD Authorized official
• St Joseph Hospital of Orange

  • General Acute Care Hospital
  • Orange, CA
  • NPI 1912982216
  NPD (past)

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

{
    "created_epoch": "1135209600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784505600000",
    "number": "1003893801",
    "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": {
        "last_name": "NGUYEN",
        "first_name": "THERESA THANH",
        "middle_name": "NGOC",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2005-12-22",
        "last_updated": "2026-07-20",
        "certification_date": "2026-07-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A61129",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "THANH",
            "last_name": "NGUYEN",
            "middle_name": "NGOC",
            "credential": "MD",
            "code": "5",
            "type": "Other Name"
        }
    ]
}

• Tammy Thu Nguyen, PA-C
• Tan Nhat Nguyen, PHARM D
• Thai Dinh Nguyen, M.D.
• Thanh Lan Thi Nguyen, PHARMD
• Thanh Quoc Nguyen, DDS
• Thu Nguyen, PHARMD
• Thu-Thuy Thi Nguyen
• Thuy Nguyen, M.D.
• Tony Tuan Nguyen, NP
• Tracey Nguyen, BEHAVIOR ANALYST

• 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; Order and Referring.
• 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.