Ruairi Joseph O Connor, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

80341 Issued in CT

Practice address

55 Lake Ave N
Worcester, MA 01655-0002

Phone

(508) 334-1000

NPI assigned

Jun 24, 2021

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: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Emergency Medicine

Education

Other, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Orion Emergency Services, Inc.Group PAC ID 5597753251, 19 clinicians

Nems PLLCGroup PAC ID 2466792833, 37 clinicians

Northeast Emergency Medicine Specialists LLCGroup PAC ID 8729157797, 34 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Day Kimball Hospital Hospital, Putnam, CT, CCN 070003
• Manchester Memorial Hospital Hospital, Manchester, CT, CCN 070027
• Windham Community Memorial Hospital Hospital, Willimantic, CT, CCN 070021
• Rockville General Hospital Hospital, Vernon, CT, CCN 070012

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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.

• Orion Emergency Services, Inc.

  • Emergency Medicine Physician
  • Milford, MA
  • NPI 1588728240
  Medicare reassignment Care Compare group NPD
• Nems PLLC

  • Emergency Medicine Physician
  • Meriden, CT
  • NPI 1114482882
  Medicare reassignment Care Compare group NPD
• Northeast Emergency Medicine Specialists, LLC

  • Emergency Medicine Physician
  • Willimantic, CT
  • NPI 1982889598
  Medicare reassignment Care Compare group NPD

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

• Day Kimball Healthcare, Inc.

  • General Acute Care Hospital
  • Putnam, CT
  • NPI 1205056371
  Care Compare affiliation
• Day Kimball Healthcare, Inc.

  • General Acute Care Hospital
  • Putnam, CT
  • NPI 1649243478
  Care Compare affiliation
• Manchester Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Manchester, CT
  • NPI 1881564664
  Care Compare affiliation
• Windham Community Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Willimantic, CT
  • NPI 1023191467
  Care Compare affiliation

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

{
    "created_epoch": "1624492800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1746576000000",
    "number": "1568031318",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "160 FREMONT ST",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016032371"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 LAKE AVE N",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016550002",
            "telephone_number": "508-334-1000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "119 Belmont St",
            "address_purpose": "LOCATION",
            "city": "Worcester",
            "state": "MA",
            "postal_code": "016052903",
            "country_code": "US",
            "telephone_number": "508-334-1000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O CONNOR",
        "first_name": "RUAIRI",
        "middle_name": "JOSEPH",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-06-24",
        "last_updated": "2025-05-07",
        "certification_date": "2025-05-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "MA",
            "license": "294733",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CT",
            "license": "80341",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nyla Laboratories
• Melissa Nylander
• Katherine Nyren, LMHC
• Leah Nystedt
• Sifa Nziavake
• Eamon O Murchu, MD
• Alan O' Hare, M.D
• Maeve O'Beirne, DO
• Reine O'Brein
• Carly Lynne O'Brien, LCSW

• Emergency Medicine Physician in Worcester, MA
• Providers in Worcester, 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 May 7, 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.