Matthew Adam Siskin, MD

Primary specialty

Hematology & Oncology PhysicianTaxonomy code 207RH0003X

License

313409 Issued in NY

Practice address

777 N Broadway
Sleepy Hollow, NY 10591-1000

Phone

(914) 366-1600

NPI assigned

Apr 3, 2020

Sex

Male

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

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

{
    "created_epoch": "1585872000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787270400000",
    "number": "1447889332",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "777 N BROADWAY",
            "city": "SLEEPY HOLLOW",
            "state": "NY",
            "postal_code": "105911000",
            "telephone_number": "914-366-1600"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "777 N BROADWAY",
            "city": "SLEEPY HOLLOW",
            "state": "NY",
            "postal_code": "105911000",
            "telephone_number": "914-366-1600"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "400 E Main St",
            "address_purpose": "LOCATION",
            "city": "Mount Kisco",
            "state": "NY",
            "postal_code": "105493417",
            "country_code": "US",
            "telephone_number": "914-242-8333",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SISKIN",
        "first_name": "MATTHEW",
        "middle_name": "ADAM",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-04-03",
        "last_updated": "2026-08-21",
        "certification_date": "2026-08-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "NY",
            "license": "313409",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Bruce D Siegel, MD
• Michael Silver
• Norman J. Sissman, M.D.
• Hennessy M Skehan, MD
• Sleepy Hollow Acupuncture LLC
• Sleepy Hollow Dental Arts P.C.
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• Hematology & Oncology Physician in Sleepy Hollow, NY
• Providers in Sleepy Hollow, NY by specialty
• Hematology & Oncology Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 21, 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.