Individual provider Active NPI

Lillian Hieu Simon

  • Clinical Social Worker
  • Pasadena, CA
National Provider Identifier
1831401173
Registry record updated Aug 24, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Clinical Social WorkerTaxonomy code 1041C0700X
License
82752 Issued in CA
Practice address
867 N Fair Oaks Ave
Pasadena, CA 91103-3050
Phone
(626) 798-6793
NPI assigned
Jul 1, 2010
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Aug 24, 2026

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

Specialties & licenses 7

Specialty (taxonomy)CodeLicenseStatePrimary
Clinical Social Worker 1041C0700X 121548 CA
Day Training/Habilitation Specialist 373H00000X CA
Mental Health Counselor 101YM0800X
Clinical Social Worker 1041C0700X 32579 CA
Rehabilitation Practitioner 225400000X
Clinical Social Worker 1041C0700X 82752 CA Primary
Social Worker 104100000X 32579 CA

Addresses

Primary practice location

867 N Fair Oaks Ave
Pasadena, CA 91103-3050

Mailing address

867 N Fair Oaks Ave
Pasadena, CA 91103-3050
Phone (626) 798-6793

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Not listed in the public Medicare enrollment file

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Not enrolled

State licenses

LicenseStateTypeSpecialty
32579CAMDSocial Worker
121548CAMDClinical Social Worker
82752CAMDClinical Social Worker

NPI Registry JSON

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

{
    "created_epoch": "1277942400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787529600000",
    "number": "1831401173",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "867 N FAIR OAKS AVE",
            "city": "PASADENA",
            "state": "CA",
            "postal_code": "911033050",
            "telephone_number": "626-798-6793"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "867 N FAIR OAKS AVE",
            "city": "PASADENA",
            "state": "CA",
            "postal_code": "911033050",
            "telephone_number": "626-798-6793"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIMON",
        "first_name": "LILLIAN",
        "middle_name": "HIEU",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2010-07-01",
        "last_updated": "2026-08-24",
        "certification_date": "2026-08-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CA",
            "license": "121548",
            "primary": false
        },
        {
            "code": "373H00000X",
            "taxonomy_group": "",
            "desc": "Day Training/Habilitation Specialist",
            "state": "CA",
            "license": null,
            "primary": false
        },
        {
            "code": "101YM0800X",
            "taxonomy_group": "",
            "desc": "Counselor, Mental Health",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CA",
            "license": "32579",
            "primary": false
        },
        {
            "code": "225400000X",
            "taxonomy_group": "",
            "desc": "Rehabilitation Practitioner",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CA",
            "license": "82752",
            "primary": true
        },
        {
            "code": "104100000X",
            "taxonomy_group": "",
            "desc": "Social Worker",
            "state": "CA",
            "license": "32579",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Pasadena, CA

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 24, 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.