Tomoko Hirabayashi Williams, MSN, RN, FNP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

NP95037243 Issued in CA

Practice address

1000 Fivepoint
Irvine, CA 92618-2621

Phone

(800) 826-4673

NPI assigned

Feb 4, 2019

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other names 1

• Tomoko Hirabayashi Sotomayor Other name

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in TX, CA2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Nurse Practitioner

Education

Other, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

City of Hope Medical FoundationGroup PAC ID 3779751656, 964 clinicians

Texas Oncology PAGroup PAC ID 5395658934, 1,001 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• City of Hope Helford Clinical Research Hospital Hospital, Duarte, CA, CCN 050146
• Baylor Scott & White Medical Center - Marble Falls Hospital, Marble Falls, TX, CCN 670108

Merit-based Incentive Payment System (MIPS)

Final score

85.12 of 100Reported as apm

Quality

67.48

Promoting interoperability

100

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Master of Science - Nursing, Nurse Practitioner, Registered Nurse

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: tomoko.sotomayor@txo.ikm.direct-ci.com
• Direct secure messaging: direct@cityofhope.direct-ci.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.

• City of Hope Medical Foundation

  • Hematology & Oncology Physician
  • Duarte, CA
  • NPI 1871886366
  Medicare reassignment Care Compare group NPD
• Texas Oncology PA

  • Medical Oncology Physician
  • El Paso, TX
  • NPI 1811944101
  Medicare reassignment Care Compare group NPD
• Texas Oncology PA

  • Medical Oncology Physician
  • Pearland, TX
  • NPI 1912174350
  NPD

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

• City of Hope National Medical Center

  • General Acute Care Hospital
  • Duarte, CA
  • NPI 1750358297
  Care Compare affiliation
• Scott & White Hospital - Marble Falls

  • General Acute Care Hospital
  • Marble Falls, TX
  • NPI 1396138970
  Care Compare affiliation

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

{
    "created_epoch": "1549238400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1770336000000",
    "number": "1255896262",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 512185",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900510185"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 FIVEPOINT",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926182621",
            "telephone_number": "800-826-4673"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "TOMOKO",
        "middle_name": "HIRABAYASHI",
        "credential": "MSN, RN, FNP-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-02-04",
        "last_updated": "2026-02-06",
        "certification_date": "2026-02-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "TX",
            "license": "AP140322",
            "primary": false
        },
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CA",
            "license": "NP95037243",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "direct@cityofhope.direct-ci.com",
            "affiliation": "Y",
            "affiliationName": "CITY OF HOPE MEDICAL FOUNDATION",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "1000 Fivepoint",
            "city": "Irvine",
            "state": "CA",
            "country_code": "US",
            "postal_code": "926182377",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "TOMOKO",
            "last_name": "SOTOMAYOR",
            "middle_name": "HIRABAYASHI",
            "credential": "MSN, RN, FNP-C",
            "code": "5",
            "type": "Other Name"
        }
    ]
}

• Priscilla Williams
• Shelley Marie Williams, FNP
• Sophia Williams
• Steven K Williams, MD
• Tawni Williams
• Nicole B Williamson
• Tracy A Williamson
• Danielle Elizabeth Willis
• Willow Laboratories, Inc.
• Willow Link LLC

• Family Nurse Practitioner in Irvine, CA
• Providers in Irvine, CA by specialty
• Family Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 6, 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.