Marcelyn Opal Billy

Primary specialty

Social WorkerTaxonomy code 104100000X

License

ASW110331 Issued in CA

Practice address

1816 Portofino Dr
Oceanside, CA 92054-6130

Phone

(760) 433-6361

NPI assigned

Jul 27, 2023

Last updated

Oct 15, 2025By the provider in NPPES

Sex

Female

Sole proprietor

Yes

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

State licenses

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Milestone House

  • Adolescent and Children Mental Health Clinic/Center
  • Oceanside, CA
  • NPI 1568094084
  NPD

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

{
    "created_epoch": "1690416000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1760486400000",
    "number": "1538840939",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1519 PEPPERWOOD WAY",
            "city": "OCEANSIDE",
            "state": "CA",
            "postal_code": "920565495",
            "telephone_number": "914-714-8453"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1816 PORTOFINO DR",
            "city": "OCEANSIDE",
            "state": "CA",
            "postal_code": "920546130",
            "telephone_number": "760-433-6361"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BILLY",
        "first_name": "MARCELYN",
        "middle_name": "OPAL",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2023-07-27",
        "last_updated": "2025-10-15",
        "certification_date": "2025-10-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "104100000X",
            "taxonomy_group": "",
            "desc": "Social Worker",
            "state": "CA",
            "license": "ASW110331",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mary Bernadette Bianca
• Nancy Ann Biasotti
• Bibi Health
• Bruce J Biederman, MD
• Nina Billingsley
• Donya L Binette, PNP
• Bio-Medical Applications of California, Inc. (North Coast Kidney Center)
• Jasmine Bird
• Birdsong Speech Therapy Inc.
• Melaku T Birhanie, M.D

• Social Worker in Oceanside, CA
• Providers in Oceanside, CA by specialty
• Social Worker in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 15, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.