Caroline Elizabeth O'Brien, FNP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

RN2333758 Issued in MA

Practice address

22 Franklin St
Medford, MA 02155-3918

Phone

(781) 350-8571

NPI assigned

Mar 13, 2025

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in MA

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

Specialty

Nurse Practitioner

Education

Other, 2024

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Beth Israel Lahey Health Primary Care, IncGroup PAC ID 7719291434, 351 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Winchester Hospital Hospital, Winchester, MA, CCN 220105

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/10729/brand/1/csg/1/fhir/r4

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.

• Beth Israel Lahey Health Primary Care Inc

  • Clinic/Center
  • Middleboro, MA
  • NPI 1568292423
  Medicare reassignment Care Compare group NPD
• Beth Israel Lahey Health Primary Care, Inc.

  • Family Medicine Physician
  • Lynnfield, MA
  • NPI 1528556529
  NPD
• Beth Israel Lahey Health Primary Care, Inc.

  • Internal Medicine Physician
  • Beverly, MA
  • NPI 1508244195
  NPD (past)

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

• Winchester Hospital

  • General Acute Care Hospital
  • Winchester, MA
  • NPI 1790740777
  Care Compare affiliation

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

{
    "created_epoch": "1741824000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1773273600000",
    "number": "1124828801",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "22 FRANKLIN ST",
            "city": "MEDFORD",
            "state": "MA",
            "postal_code": "021553918",
            "telephone_number": "781-350-8571"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "22 FRANKLIN ST",
            "city": "MEDFORD",
            "state": "MA",
            "postal_code": "021553918",
            "telephone_number": "781-350-8571"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "23 Warren Ave Ste 100",
            "address_purpose": "LOCATION",
            "city": "Woburn",
            "state": "MA",
            "postal_code": "018014979",
            "country_code": "US",
            "telephone_number": "781-933-1198",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "CAROLINE",
        "middle_name": "ELIZABETH",
        "credential": "FNP-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2025-03-13",
        "last_updated": "2026-03-12",
        "certification_date": "2026-03-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "MA",
            "license": "RN2333758",
            "primary": true
        },
        {
            "code": "163W00000X",
            "taxonomy_group": "",
            "desc": "Registered Nurse",
            "state": "MA",
            "license": "RN2333758",
            "primary": false
        },
        {
            "code": "163W00000X",
            "taxonomy_group": "",
            "desc": "Registered Nurse",
            "state": "NH",
            "license": "093013-21S",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• North Atlantic Podiatry, P.C.
• Rachael Kay Novicki, NP
• NS Recovery Services LLC
• John Paul Nsubuga, MD
• Solomon Chimaobim Nwachukwu, RN
• Gillian Bradshaw O'Brien
• Paul R. O'Brien, EDD
• Virginia R O'Connell Ryan, LICSW
• Kelli O'Connor
• Kathleen M O'Dea, P. A. - C.

• Family Nurse Practitioner in Medford, MA
• Providers in Medford, MA by specialty
• Family Nurse Practitioner in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 12, 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.