Susan Lynn O'Neill-Sigur, MA

Primary specialty

Case Manager/Care CoordinatorTaxonomy code 171M00000X

Practice address

7000B S Center Dr
Clearlake, CA 95422-8458

Phone

(707) 994-7090

Fax

(530) 232-0293

NPI assigned

Sep 15, 2025

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Master of Arts

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

{
    "created_epoch": "1757894400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757894400000",
    "number": "1811868672",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7000B S CENTER DR",
            "city": "CLEARLAKE",
            "state": "CA",
            "postal_code": "954228458",
            "telephone_number": "707-994-7090",
            "fax_number": "530-232-0293"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "7000B S CENTER DR",
            "city": "CLEARLAKE",
            "state": "CA",
            "postal_code": "954228458",
            "telephone_number": "707-994-7090",
            "fax_number": "530-232-0293"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'NEILL-SIGUR",
        "first_name": "SUSAN",
        "middle_name": "LYNN",
        "credential": "MA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2025-09-15",
        "last_updated": "2025-09-15",
        "certification_date": "2025-09-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "171M00000X",
            "taxonomy_group": "",
            "desc": "Case Manager/Care Coordinator",
            "state": "CA",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Denise Louise Newman, CADC II
• Bao-Quyen Nguyen, DO
• Stephanie Rose Nguyen, PHARMD
• Kiara Nichols
• Taylor O'Connor
• Richard Domanick Occhino
• Stephanie Osterman Odney, CAADAC
• Whie Oh, MD
• Edgar Ontiveros
• Tammy Ezinne Onu

• Case Manager/Care Coordinator in Clearlake, CA
• Providers in Clearlake, CA by specialty
• Case Manager/Care Coordinator in California

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