William Joseph Frem, DO

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

20A22067 Issued in CA

Practice address

1720 E Cesar E Chavez Ave
Los Angeles, CA 90033-2414

Phone

(323) 268-5000

NPI assigned

Jun 22, 2022

Sex

Male

Sole proprietor

No

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

Internal Medicine

Education

Other, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Galen Inpatient Physicians PCGroup PAC ID 3678464633, 1,045 clinicians

White Memorial Medical CenterGroup PAC ID 4486622362, 68 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Adventist Health White Memorial Hospital, Los Angeles, CA, CCN 050103

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: william.frem.1@27758.direct.athenahealth.com

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.

• White Memorial Medical Center

  • General Acute Care Hospital
  • Los Angeles, CA
  • NPI 1215927470
  Medicare reassignment Care Compare group NPD
• Galen Inpatient Physicians, PC

  • Hospitalist Physician
  • Manteca, CA
  • NPI 1689320459
  Medicare reassignment Care Compare group

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

• White Memorial Medical Center

  • General Acute Care Hospital
  • Los Angeles, CA
  • NPI 1215927470
  Care Compare affiliation

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

{
    "created_epoch": "1655856000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756857600000",
    "number": "1831820646",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1720 E CESAR E CHAVEZ AVE",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900332414",
            "telephone_number": "323-268-5000"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1720 E CESAR E CHAVEZ AVE",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900332414",
            "telephone_number": "323-268-5000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FREM",
        "first_name": "WILLIAM",
        "middle_name": "JOSEPH",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-06-22",
        "last_updated": "2025-09-03",
        "certification_date": "2025-09-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "20A22067",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nelson Bruce Freimer
• Michael Anthony Freire
• Bonnie Cary Freitas, M.D.
• Lauren Freitas, DPT
• Sally L. Freitas, MD
• Caroline French
• Crystal French
• Nailah French, AMFT
• Olivia French
• Samuel Wheeler French, MD

• Internal Medicine Physician in Los Angeles, CA
• Providers in Los Angeles, 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 Sep 3, 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.