Alexandra W Hallacy

Primary specialty

Surgical Physician AssistantTaxonomy code 363AS0400X

License

026049 Issued in NY

Practice address

1176 5TH Ave
New York, NY 10029-6503

Phone

(212) 241-3300

NPI assigned

Jan 13, 2021

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

Other names 1

• Alexandra Williams Professional name

Medicare fee-for-service enrollment

Enrolled in NY

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Networks

• Healthfirst Medicare Network H9678
• Healthfirst Medicare Network H3359
• Healthfirst Medicare Network H1722
• Healthfirst Medicare Network H5989

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

• Icahn School of Medicine at Mount Sinai

  dba TISCH Department of Mount Sinai

  • Hematology & Oncology Physician
  • New York, NY
  • NPI 1750649612
  Medicare reassignment NPD
• Icahn School of Medicine at Mount Sinai

  dba New York Eye & Ear Optical Shop

  • Eyewear Supplier
  • New York, NY
  • NPI 1760227466
  NPD
• Icahn School of Medicine at Mount Sinai

  dba OB/GYN Department of Mount Sinai

  • Obstetrics & Gynecology Physician
  • New York, NY
  • NPI 1124392212
  NPD (past)

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

{
    "created_epoch": "1610496000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785456000000",
    "number": "1689263873",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "48 1/2 E 7TH ST APT 4A",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100038439",
            "telephone_number": "214-957-3010"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1176 5TH AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100296503",
            "telephone_number": "212-241-3300"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1275 York Ave",
            "address_purpose": "LOCATION",
            "city": "New York",
            "state": "NY",
            "postal_code": "100656007",
            "country_code": "US",
            "telephone_number": "347-798-9213",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HALLACY",
        "first_name": "ALEXANDRA",
        "middle_name": "W",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2021-01-13",
        "last_updated": "2026-07-31",
        "certification_date": "2026-07-31",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363AS0400X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Surgical",
            "state": "NY",
            "license": "026049",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "ALEXANDRA",
            "last_name": "WILLIAMS",
            "code": "2",
            "type": "Professional Name"
        }
    ]
}

• Suzanne R Hall, O.D.
• Sylvie Hall, PHARMD
• Thea Krystal Hall, DPT
• Willa Hall, PH.D.
• Yasmine Hallab
• Vicki (Vasiliki) Katherine Hallas, LCSW
• Steven G Halle, M.D,
• Ania Hallenbeck
• April S Hallenbeck, OTR/L
• Heidi Hallenbeck

• Surgical Physician Assistant in New York, NY
• Providers in New York, NY by specialty
• Surgical Physician Assistant in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 31, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.