Aileen Grace Guillen, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

200783 Issued in CA

Practice address

1000 W Carson St BLDG N-14
Torrance, CA 90502-2004

Phone

(424) 306-5400

NPI assigned

Apr 3, 2023

Last updated

Sep 4, 2025By the provider in NPPES

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

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

Emergency Medicine

Education

Other, 2023

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Hospital & facility affiliations

• Lac/Harbor-UCLA Med Center Hospital, Torrance, CA, CCN 050376

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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.

• County of Los Angeles

  dba County of Los Angeles Harbor UCLA Medical Center

  • General Acute Care Hospital
  • Torrance, CA
  • NPI 1851363188

  Single Specialty

  Medicare reassignment NPD
• County of Los Angeles

  • Clinic/Center
  • Los Angeles, CA
  • NPI 1295407401
  NPD
• County of Los Angeles

  dba Hubert H. Humphrey CHC

  • Clinic/Center
  • Los Angeles, CA
  • NPI 1346258720

  Single Specialty

  NPD

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

• County of Los Angeles

  dba LAC Harbor UCLA Medical Center

  • General Acute Care Hospital
  • Torrance, CA
  • NPI 1477574838
  Care Compare affiliation

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

{
    "created_epoch": "1680480000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756944000000",
    "number": "1427753946",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1000 W CARSON ST",
            "city": "TORRANCE",
            "state": "CA",
            "postal_code": "905022059",
            "telephone_number": "424-306-5400"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 W CARSON ST BLDG N-14",
            "city": "TORRANCE",
            "state": "CA",
            "postal_code": "905022004",
            "telephone_number": "424-306-5400"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GUILLEN",
        "first_name": "AILEEN",
        "middle_name": "GRACE",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2023-04-03",
        "last_updated": "2025-09-04",
        "certification_date": "2025-09-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "200783",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jovy C Novilla Guevarra, RN
• Margaret Anne Guglielmo, NP
• Caryn Guido, NP
• Guilda Sarraf, M.D., Inc.
• Abigail Yariss Guillen
• Jasmin Guillen
• Guillermo S, Castillo DDS Dental Corporation
• Susan E Guillou, MFT
• Giovanna Guinto
• Theresa Guion Rojes, RN

• Emergency Medicine Physician in Torrance, CA
• Providers in Torrance, CA by specialty
• Emergency Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 4, 2025; 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.