Carolyn M O'Brien, N.P

Primary specialty

Adult Health Nurse PractitionerTaxonomy code 363LA2200X

License

190716 Issued in MA

Practice address

31 Daniels St
Franklin, MA 02038-1103

Phone

(508) 530-3140

Fax

(508) 538-3142

NPI assigned

Oct 18, 2005

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other identifiers 1

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, 1996

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Umass Memorial Medical Group IncGroup PAC ID 4284539891, 2,494 clinicians

Milford Regional Physician Group, Inc.Group PAC ID 5597679449, 219 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Milford Regional Medical Center Hospital, Milford, MA, CCN 220090

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/86/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.

• Milford Regional Physician Group, Inc.

  • Internal Medicine Physician
  • Milford, MA
  • NPI 1902856024

  MA

  Medicare reassignment Care Compare group NPD
• Umass Memorial Medical Group Inc

  • Internal Medicine Physician
  • Worcester, MA
  • NPI 1760445373

  MA, Nurse Practitioner

  Medicare reassignment Care Compare group NPD
• Milford Regional Physician Group, Inc.

  • Cardiovascular Disease Physician
  • Milford, MA
  • NPI 1285031039
  NPD
• Milford Regional Physician Group, Inc.

  • Sports Medicine (Family Medicine) Physician
  • Medway, MA
  • NPI 1508681321
  NPD
• Umass Memorial Medical Group, Inc.

  • Urgent Care Clinic/Center
  • Oxford, MA
  • NPI 1982381018
  NPD
• Asthma & Allergy Affiliates Inc

  • Allergy Physician
  • Salem, MA
  • NPI 1245300045
  NPD (past)
• Eugene C. Jagella, M.D. PC

  • Internal Medicine Physician
  • Milford, MA
  • NPI 1528045812
  NPD (past)
• Mt Auburn Professional Services

  • Internal Medicine Physician
  • Cambridge, MA
  • NPI 1013375203
  NPD (past)

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

• Umass Memorial Health-Milford Regional Medical Center Inc

  • General Acute Care Hospital
  • Milford, MA
  • NPI 1477527497

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1129593600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756339200000",
    "number": "1104815539",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 383",
            "city": "FRANKLIN",
            "state": "MA",
            "postal_code": "020380383",
            "telephone_number": "508-530-3140",
            "fax_number": "508-530-3142"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "31 DANIELS ST",
            "city": "FRANKLIN",
            "state": "MA",
            "postal_code": "020381103",
            "telephone_number": "508-530-3140",
            "fax_number": "508-538-3142"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "100 Commerce Dr",
            "address_purpose": "LOCATION",
            "city": "Northbridge",
            "state": "MA",
            "postal_code": "015341415",
            "country_code": "US",
            "telephone_number": "508-234-6311",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "CAROLYN",
        "middle_name": "M",
        "credential": "N.P",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2005-10-18",
        "last_updated": "2025-08-28",
        "certification_date": "2025-08-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "MA",
            "license": "RN190716",
            "primary": false
        },
        {
            "code": "363LA2200X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Adult Health",
            "state": "MA",
            "license": "190716",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0384950",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Northeastern Health LLC
• Northeastern Health LLC
• Constance Norton, RN, MSN,CPNP
• NSL Franklin LLC
• Nuch of Massachusetts, LLC
• Nicole O'Donnell
• Cara O'Toole, PHARM.D
• Brandi Oakley, DPT, PT
• Olga Krikunenko DMD, LLC
• Glen Edward Ollis, NP

• All providers in Franklin, MA
• Adult Health Nurse Practitioner in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 28, 2025; 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.