Daniel Patrick O'Brien, PA-C

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

PA8087 Issued in MA

Practice address

9 Watkins LN
Southborough, MA 01772-2072

Phone

(508) 612-1567

NPI assigned

Aug 6, 2020

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

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

Physician Assistant

Education

Other, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

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

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

Practice addresses (Care Compare)

Hospital & facility affiliations

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

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: obrien.daniel.mrmc@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 and National Provider Directory roles.

• Milford Regional Physician Group, Inc.

  • Internal Medicine Physician
  • Milford, MA
  • NPI 1902856024
  Medicare reassignment Care Compare group NPD
• Umass Memorial Medical Group Inc

  • Internal Medicine Physician
  • Worcester, MA
  • NPI 1760445373

  Emergency Medicine

  Medicare reassignment Care Compare group NPD
• Orion Emergency Services, Inc.

  • Emergency Medicine Physician
  • Milford, MA
  • NPI 1588728240
  Medicare reassignment
• 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

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
  Care Compare affiliation

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

{
    "created_epoch": "1596672000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756339200000",
    "number": "1689284366",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8 CIRRUS DR APT 8103",
            "city": "ASHLAND",
            "state": "MA",
            "postal_code": "017214458",
            "telephone_number": "508-612-1567"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "9 WATKINS LN",
            "city": "SOUTHBOROUGH",
            "state": "MA",
            "postal_code": "017722072",
            "telephone_number": "508-612-1567"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "129 S Main St",
            "address_purpose": "LOCATION",
            "city": "Milford",
            "state": "MA",
            "postal_code": "017573290",
            "country_code": "US",
            "telephone_number": "774-462-3339",
            "fax_number": "508-381-0204",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "DANIEL",
        "middle_name": "PATRICK",
        "name_prefix": "Mr.",
        "credential": "PA-C",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2020-08-06",
        "last_updated": "2025-08-28",
        "certification_date": "2025-08-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MA",
            "license": "PA8087",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MA",
            "license": "PA8087",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Danielle Marie Nofsinger, MS, OTR/L
• Northeast Medical Equipment Inc
• Northstar Recovery Center, LLC
• Janda Angenette Nuovo
• Leah Nyberg
• Alyssa Deborah O'Leary, CCC-SLP
• Caitlyn O'Reilly
• Norman S Ober, M.D.
• Uche Judith Ojukwu, EEC CERTIFICATION
• Katherine Oleary

• Emergency Medicine Physician in Southborough, MA
• Providers in Southborough, MA by specialty
• Emergency Medicine Physician 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.