Cassie Jillian Firestone

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

C0010547 Issued in MD

Practice address

400 W 7TH St
Frederick, MD 21701-4506

Phone

(240) 566-3300

NPI assigned

May 7, 2025

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

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

{
    "created_epoch": "1746576000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782259200000",
    "number": "1104616853",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "461 PELETON ST",
            "city": "HAGERSTOWN",
            "state": "MD",
            "postal_code": "217402299",
            "telephone_number": "443-253-5045"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "400 W 7TH ST",
            "city": "FREDERICK",
            "state": "MD",
            "postal_code": "217014506",
            "telephone_number": "240-566-3300"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FIRESTONE",
        "first_name": "CASSIE",
        "middle_name": "JILLIAN",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2025-05-07",
        "last_updated": "2026-06-24",
        "certification_date": "2026-06-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MD",
            "license": "C0010547",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Physician Assistant in Frederick, MD
• Providers in Frederick, MD by specialty
• Physician Assistant in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 24, 2026; 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.