William Casas

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

A139442 Issued in CA

Practice address

2333 Foothill Blvd Ste B
La Verne, CA 91750-3027

Phone

(909) 392-6501

Fax

(909) 469-2136

NPI assigned

May 1, 2013

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

Other identifiers 1

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

Family Practice

Education

Other, 1996

Medicare assignment

May accept Medicare assignment

Telehealth

Offers telehealth services

Group practices

Premier Family Medicine Associates, IncGroup PAC ID 4284547522, 65 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Pomona Valley Hospital Medical Center Hospital, Pomona, CA, CCN 050231

Procedures performed for Medicare patients

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 and National Provider Directory roles.

• Premier Family Medicine Associates, Inc

  • Health Service Clinic/Center
  • Pomona, CA
  • NPI 1912907114

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Premier Family Medicine Associates, Inc

  • Health Service Clinic/Center
  • La Verne, CA
  • NPI 1033634373

  Family Medicine

  NPD
• Premier Family Medicine Associates, Inc

  • Health Service Clinic/Center
  • Chino Hills, CA
  • NPI 1730112426

  Family Medicine

  NPD
• Pomona Valley Hospital Medical Center

  • General Acute Care Hospital
  • Pomona, CA
  • NPI 1518067586
  NPD (past)
• Premier Family Medicine Associates, Inc

  • Health Service Clinic/Center
  • Claremont, CA
  • NPI 1164668786

  Family Medicine

  NPD (past)

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

• Pomona Valley Hospital Medical Center

  • General Acute Care Hospital
  • Pomona, CA
  • NPI 1407813660
  Care Compare affiliation

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

{
    "created_epoch": "1367366400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771977600000",
    "number": "1477998615",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2333 FOOTHILL BLVD STE B",
            "city": "LA VERNE",
            "state": "CA",
            "postal_code": "917503027",
            "telephone_number": "909-392-6501",
            "fax_number": "909-469-2136"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2333 FOOTHILL BLVD STE B",
            "city": "LA VERNE",
            "state": "CA",
            "postal_code": "917503027",
            "telephone_number": "909-392-6501",
            "fax_number": "909-469-2136"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CASAS",
        "first_name": "WILLIAM",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2013-05-01",
        "last_updated": "2026-02-25",
        "certification_date": "2026-02-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "CA",
            "license": "A139442",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1477998615",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Kyoko Canizales, PHD
• Melissa Capacete
• Alicia Cardenas
• Weston James Carpiaux, DDS, MS
• Jotanna Angelene Carretino, LVN
• Rey Castillo Emmanuelli, PA
• Valerie Castro
• Amy Giselle Ceballos
• Taylor Celindro
• Rene C Cendejas, B.S.

• Family Medicine Physician in La Verne, CA
• Providers in La Verne, CA by specialty
• Family Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 25, 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.