Rachael Marie Nieznajomski, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

PA4023 Issued in MA

Practice address

830 Constitution Ave
Littleton, MA 01460

Phone

(978) 287-8990

Fax

(978) 679-1825

NPI assigned

Aug 25, 2010

Last updated

Jan 29, 2026By the provider in NPPES

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

Other names 1

• Rachael Markey Former name

Medicare fee-for-service enrollment

Enrolled in MA, NH2 enrollments

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 2

Specialty

Physician Assistant

Education

Other, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Emerson Practice Associates, IncGroup PAC ID 8123188117, 247 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Emerson Hospital - Hospital, W Concord, MA, CCN 220084

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: markey.rachael.epa@direct.partners.masshiway.net

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

• Emerson Practice Associates, Inc.

  • Internal Medicine Physician
  • Concord, MA
  • NPI 1508020199
  Medicare reassignment Care Compare group
• Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

  dba APHMFP-Emergency Medicine

  • Emergency Medical Services (Emergency Medicine) Physician
  • Boston, MA
  • NPI 1952358533
  Medicare reassignment NPD
• Emergency Physician Associates of Massachusetts PC

  • Emergency Medicine Physician
  • Worcester, MA
  • NPI 1730885252
  Medicare reassignment
• St Joseph Hospital of Nashua NH

  • General Acute Care Hospital
  • Nashua, NH
  • NPI 1093787384
  Medicare reassignment
• Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

  dba Associated Physicians of HMFP

  • Multi-Specialty Clinic/Center
  • Boston, MA
  • NPI 1861216038
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Emerson Hospital

  • General Acute Care Hospital
  • Concord, MA
  • NPI 1922103357
  Care Compare affiliation

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

{
    "created_epoch": "1282694400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1769644800000",
    "number": "1306152657",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "830 CONSTITUTION AVE",
            "city": "LITTLETON",
            "state": "MA",
            "postal_code": "01460",
            "telephone_number": "978-287-8990",
            "fax_number": "978-679-1825"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "830 CONSTITUTION AVE",
            "city": "LITTLETON",
            "state": "MA",
            "postal_code": "01460",
            "telephone_number": "978-287-8990",
            "fax_number": "978-679-1825"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "123 Summer St",
            "address_purpose": "LOCATION",
            "city": "Worcester",
            "state": "MA",
            "postal_code": "016081216",
            "country_code": "US",
            "telephone_number": "781-438-0745",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "NIEZNAJOMSKI",
        "first_name": "RACHAEL",
        "middle_name": "MARIE",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2010-08-25",
        "last_updated": "2026-01-29",
        "certification_date": "2026-01-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MA",
            "license": "PA4023",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "RACHAEL",
            "last_name": "MARKEY",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

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• Physician Assistant in Littleton, MA
• Providers in Littleton, MA by specialty
• Physician Assistant in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 29, 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.