Frank Castillo Jr., NP

Primary specialty

Nurse PractitionerTaxonomy code 363L00000X

License

95004634 Issued in CA

Practice address

100 N Wiget LN Ste 290
Walnut Creek, CA 94598-5901

Phone

(925) 937-7740

NPI assigned

Aug 5, 2016

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

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: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Nurse Practitioner

Education

Other, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

John Muir Physician NetworkGroup PAC ID 6608789813, 488 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• John Muir Medical Center - Walnut Creek Campus Hospital, Walnut Creek, CA, CCN 050180
• John Muir Medical Center - Concord Campus Hospital, Concord, CA, CCN 050496

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

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.

• John Muir Physician Network

  • General Practice Physician
  • Walnut Creek, CA
  • NPI 1841407665
  Medicare reassignment Care Compare group NPD

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

• John Muir Health

  • General Acute Care Hospital
  • Walnut Creek, CA
  • NPI 1740215219
  Care Compare affiliation
• John Muir Health

  • General Acute Care Hospital
  • Concord, CA
  • NPI 1801821376
  Care Compare affiliation

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

{
    "created_epoch": "1470355200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758499200000",
    "number": "1639623770",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1450 TREAT BLVD STE 300",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945972168",
            "telephone_number": "925-952-2828"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 N WIGET LN STE 290",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945985901",
            "telephone_number": "925-937-7740"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CASTILLO",
        "first_name": "FRANK",
        "name_suffix": "Jr.",
        "credential": "NP",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2016-08-05",
        "last_updated": "2025-09-22",
        "certification_date": "2025-09-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LA2100X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Acute Care",
            "state": "CA",
            "license": "95004634",
            "primary": false
        },
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "CA",
            "license": "95004634",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Sinai Castaneda
• Alexis Castanon
• Stephanie Castellanos
• Aiza Castillo
• Angie Castillo
• India S Castillo
• Joseph Edward Castillo Jr., RADT
• Myla Castillo
• Priscila Castillo
• Roger E Castillo, PA-C

• Nurse Practitioner in Walnut Creek, CA
• Providers in Walnut Creek, CA by specialty
• Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 22, 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.