Patrick W. O'Brien, PA-C

Primary specialty

Surgical Physician AssistantTaxonomy code 363AS0400X

Practice address

271 Carew St
Springfield, MA 01104-2377

Phone

(413) 748-7353

NPI assigned

May 31, 2016

Sex

Male

Sole proprietor

No

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 CT, MA2 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, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Riverbend Medical Group IncGroup PAC ID 5698064343, 227 clinicians

SC Orthopedics of New England, PC.Group PAC ID 4385907609, 10 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Mercy Medical Ctr Hospital, Springfield, MA, CCN 220066

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.

• Riverbend Medical Group, Inc.

  • Internal Medicine Physician
  • Springfield, MA
  • NPI 1841651197
  Medicare reassignment Care Compare group
• SC Orthopedics of New England,PC.

  • Orthopaedic Surgery Physician
  • Springfield, MA
  • NPI 1922502095
  Medicare reassignment Care Compare group
• Adfinitas Health at the Mercy Hospital PLLC

  • Hospitalist Physician
  • Springfield, MA
  • NPI 1669036737
  Medicare reassignment
• Mercy Inpatient Medical Associates Inc.

  • Internal Medicine Physician
  • Springfield, MA
  • NPI 1407845282
  Medicare reassignment
• Trinity Health of New England Provider Network Organization Inc

  • Internal Medicine Physician
  • Hartford, CT
  • NPI 1003882812
  Medicare reassignment
• Riverbend Medical Group, Inc

  • Durable Medical Equipment & Medical Supplies
  • Springfield, MA
  • NPI 1265023154
  NPD
• Trinity Health of New England Provider Network Organization Inc

  • Internal Medicine Physician
  • Waterville, ME
  • NPI 1134779531
  NPD
• Orthopedic Associates of Hartford,PC

  • Orthopaedic Surgery Physician
  • Hartford, CT
  • NPI 1972500304
  NPD (past)

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

• The Mercy Hospital Inc

  • General Acute Care Hospital
  • Springfield, MA
  • NPI 1043204316
  Care Compare affiliation
• The Mercy Hospital Inc

  • Rehabilitation Hospital Unit
  • Springfield, MA
  • NPI 1750360798
  Care Compare affiliation

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

{
    "created_epoch": "1464652800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785456000000",
    "number": "1134577141",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "271 CAREW ST",
            "address_2": "DEPARTMENT OF SURGERY",
            "city": "SPRINGFIELD",
            "state": "MA",
            "postal_code": "011042377",
            "telephone_number": "413-748-7353"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "271 CAREW ST",
            "city": "SPRINGFIELD",
            "state": "MA",
            "postal_code": "011042377",
            "telephone_number": "413-748-7353"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "PATRICK",
        "middle_name": "W.",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2016-05-31",
        "last_updated": "2026-07-31",
        "certification_date": "2026-07-31",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363AS0400X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Surgical",
            "state": "CT",
            "license": null,
            "primary": false
        },
        {
            "code": "363AS0400X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Surgical",
            "state": "MA",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Dennis J O'Brien, RN
• Dennis S O'Brien, PAC
• Kellyann O'Brien, PA-C
• Kerry Joan O'Brien, BS
• Patrick K O'Brien
• O'Connell Professional Nurse Service Inc.
• Christopher William O'Connell
• Christine Ann O'Connor, R.N.
• Daniel O'Connor, PHARMD
• Julia Rose O'Connor, PA

• Surgical Physician Assistant in Springfield, MA
• Providers in Springfield, MA by specialty
• Surgical Physician Assistant in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 31, 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.