Vivian To, DO

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

20A21692 Issued in CA

Practice address

11500 Brookshire Ave
Downey, CA 90241-4917

Phone

(562) 904-5000

NPI assigned

Apr 5, 2021

Sex

Female

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: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Hospitalist

Education

West Virginia School of Osteopathic Medicine, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Pih Health PhysiciansGroup PAC ID 8426951328, 616 clinicians

Apollomed Hospitalists a Medical CorporationGroup PAC ID 5991857708, 31 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Garfield Medical Center Hospital, Monterey Park, CA, CCN 050737
• Pih Health Good Samaritan Hospital Hospital, Los Angeles, CA, CCN 050471
• Pih Health Downey Hospital Hospital, Downey, CA, CCN 050393
• Alhambra Hospital Medical Center Hospital, Alhambra, CA, CCN 050281

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/

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.

• Astrana Care Hospitalists, a Medical Corporation

  • Hospitalist Physician
  • Alhambra, CA
  • NPI 1265658595
  Medicare reassignment Care Compare group NPD
• Pih Health Physicians

  • Family Medicine Physician
  • Whittier, CA
  • NPI 1609233899
  Medicare reassignment Care Compare group NPD
• Healthcare Partners Affiliates Medical Group

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1659312593
  Medicare reassignment NPD
• Healthcare Partners Affiliates Medical Group

  • Durable Medical Equipment & Medical Supplies
  • Murrieta, CA
  • NPI 1760057269
  NPD
• Pih Health Physicians

  • Ophthalmology Physician
  • Whittier, CA
  • NPI 1295131621
  NPD
• Applecare Hospitalist Medical Group, Inc.

  • Internal Medicine Physician
  • Downey, CA
  • NPI 1629037577
  NPD (past)

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

• Ahmc Garfield Medical Center LP

  • General Acute Care Hospital
  • Monterey Park, CA
  • NPI 1730171265
  Care Compare affiliation
• Alhambra Hospital Medical Center, LP

  • General Acute Care Hospital
  • Alhambra, CA
  • NPI 1770612756
  Care Compare affiliation
• Pih Health Downey Hospital

  • General Acute Care Hospital
  • Downey, CA
  • NPI 1265433551
  Care Compare affiliation
• Pih Health Good Samaritan Hospital

  • General Acute Care Hospital
  • Los Angeles, CA
  • NPI 1508859323
  Care Compare affiliation

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

{
    "created_epoch": "1617580800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761696000000",
    "number": "1043899230",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "11500 BROOKSHIRE AVE",
            "city": "DOWNEY",
            "state": "CA",
            "postal_code": "902414917"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11500 BROOKSHIRE AVE",
            "city": "DOWNEY",
            "state": "CA",
            "postal_code": "902414917",
            "telephone_number": "562-904-5000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TO",
        "first_name": "VIVIAN",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2021-04-05",
        "last_updated": "2025-10-29",
        "certification_date": "2025-10-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CA",
            "license": "20A21692",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Alfred Zach O Tingabngab IV
• Kyaw Tint
• Bradley Tirador, PT
• Kary Vuonglan To, PH.D.
• Leslie Thuylan To, PH.D.
• Sophie Nythan Tochioka, PHARMD
• Leilani Tocong
• Luis Edward Toledano II
• Karina Cosue Toliver, FNP-C
• Jalithze Alexandra Toma

• Hospitalist Physician in Downey, CA
• Providers in Downey, CA by specialty
• Hospitalist Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 29, 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.