Gregory McArdle Williams, MD, MBA

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

344899 Issued in NY

Practice address

100 E 77TH St
New York, NY 10075-1850

Phone

(212) 434-4763

Fax

(212) 434-2246

NPI assigned

Mar 22, 2023

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

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Specialty

Internal Medicine

Education

Other, 2023

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Interoperability endpoints

• Direct secure messaging: gwilliams71399@northwell.direct-ci.com

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

{
    "created_epoch": "1679443200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782777600000",
    "number": "1528761368",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "622 HOMESTEAD AVE",
            "city": "SCOTTDALE",
            "state": "PA",
            "postal_code": "156832700",
            "telephone_number": "724-875-2167"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 E 77TH ST",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100751850",
            "telephone_number": "212-434-4763",
            "fax_number": "212-434-2246"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "GREGORY",
        "middle_name": "MCARDLE",
        "name_prefix": "Dr.",
        "credential": "MD, MBA",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2023-03-22",
        "last_updated": "2026-06-30",
        "certification_date": "2026-06-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NY",
            "license": "344899",
            "primary": true
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "NY",
            "license": "344899",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Georgia Stacy Williams, CRNA
• Gibbs Alan Williams, PH.D
• Gizele Williams, CRNA
• Glory J Williams
• Grace McCleary Williams, LCSW
• Gwendoline Warner Williams, L.AC.
• Gwendolyn Williams, RN
• Haley Corinne Keiko Williams, PT, DPT
• Hallie Williams, D.D.S.
• Haniffa Williams

• Internal Medicine Physician in New York, NY
• Providers in New York, NY by specialty
• Internal Medicine Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 30, 2026; 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.