Margaret Ann Bielefeld, PHYSICIAN ASSISTANT

Primary specialty

Physician AssistantTaxonomy code 363A00000X

Practice address

1275 York Ave
New York, NY 10065-6007

Phone

(720) 438-8010

NPI assigned

Aug 1, 2024

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

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

Practice roles

Locations

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

  • Surgery Physician
  • New York, NY
  • NPI 1770823551
  Medicare reassignment NPD
• Mskcc Surgery Group

  • Surgical Oncology Physician
  • New York, NY
  • NPI 1699766261
  Medicare reassignment NPD
• Icahn School of Medicine at Mount Sinai

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

  • Infectious Disease Physician
  • New York, NY
  • NPI 1659639524
  NPD (past)

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

{
    "created_epoch": "1722470400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767312000000",
    "number": "1932938347",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1275 YORK AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100656007",
            "telephone_number": "720-438-8010"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1275 YORK AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100656007",
            "telephone_number": "720-438-8010"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BIELEFELD",
        "first_name": "MARGARET",
        "middle_name": "ANN",
        "credential": "PHYSICIAN ASSISTANT",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2024-08-01",
        "last_updated": "2026-01-02",
        "certification_date": "2026-01-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Katherine Bieger, PHD
• Elizabeth Biehl, PT, DPT
• Kent Robert Biehler, DPM
• Lindsey Biel, OTR/L
• Amy E Bielefeld, MS, CCC-SLP
• Teryn Bieler, OTR/L
• Agata Bielska, M.D. PH.D.
• Wiktoria Barbara Bielska, MD
• Marc J Bielski, M.D.
• Michele Faye Bielski, LMT

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

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 2, 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.