NPIMap

Individual provider Active NPI

Duc Nguyen, MD

  • Internal Medicine Physician
  • Santa Ana, CA
National Provider Identifier
1306945365
Registry record updated Sep 21, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
A53620 Issued in CA
Practice address
2621 S Bristol St
Santa Ana, CA 92704-5766
Phone
(805) 520-1577
Fax
(805) 520-8091
NPI assigned
Sep 22, 2006
Last updated
Sep 21, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 21, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X A53620 CA Primary

Addresses

Primary practice location

2621 S Bristol St
Santa Ana, CA 92704-5766

Mailing address

1177 Roadrunner Way
Simi Valley, CA 93065-3159
Phone (805) 520-1577

Other practice location 1

1177 Roadrunner Way
Simi Valley, CA 93065-3159
Phone (805) 520-1577

Other identifiers 1

IdentifierTypeStateIssuer
00A536201MedicaidCA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20040825000522 CA Practitioner - Internal MedicinePractitioner - Critical Care (Intensivists)Practitioner - Pulmonary Disease 8224002142 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Internal MedicineAlso: Critical Care (Intensivists), Pulmonary Disease
Education
University of California, Irvine, California College of Medicine, 1989
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services

Practice addresses (Care Compare)

1177 Roadrunner Way
Simi Valley, CA 93065-3159
Phone (805) 520-1577

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
88.57 of 100Reported as individual
Quality
76.82
Improvement activities
40
Cost
65.55

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
A53620CAMDPulmonary Disease Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Intensive Care Medical Specialists Inc Pulmonary Disease CurrentSince Mar 1, 2016 Accepting new patients
Duc Nguyen MD Corp Pulmonary Disease CurrentSince Dec 3, 2001 Accepting new patients
NPI 1033163019 Past Accepting new patients
Simi Valley Hospital and Health Care Services Past Accepting new patients

Locations

1177 Roadrunner Way
Simi Valley, CA 93065
Phone (805) 520-1577

2650 Jones Way
Ste 7
Simi Valley, CA 93065
Phone (805) 520-1577

2975 Sycamore Dr
Simi Valley, CA 93065
Phone (805) 522-2500

227 W Janss Rd
Ste 345
Thousand Oaks, CA 91360
Phone (805) 306-0304

Interoperability endpoints

  • Direct secure messaging: duc.nguyen.p12@direct.regal.nextgenshare.com
  • FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/

Organizations & group practices 4

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

Hospital & facility affiliations 22

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

View all 22

NPI Registry JSON

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

{
    "created_epoch": "1158883200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1789948800000",
    "number": "1306945365",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1177 ROADRUNNER WAY",
            "city": "SIMI VALLEY",
            "state": "CA",
            "postal_code": "930653159",
            "telephone_number": "805-520-1577",
            "fax_number": "805-520-8091"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2621 S BRISTOL ST",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927045766",
            "telephone_number": "805-520-1577",
            "fax_number": "805-520-8091"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1177 Roadrunner Way",
            "address_purpose": "LOCATION",
            "city": "Simi Valley",
            "state": "CA",
            "postal_code": "930653159",
            "country_code": "US",
            "telephone_number": "805-520-1577",
            "fax_number": "805-520-8091",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "NGUYEN",
        "first_name": "DUC",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-09-22",
        "last_updated": "2026-09-21",
        "certification_date": "2026-09-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A53620",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00A536201",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Santa Ana, CA

Sources for this page

Verify at the official NPI Registry.