Michael O'Brien, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

PA100930 Issued in MA

Practice address

70 Acrebrook Dr
Florence, MA 01062-3421

Phone

(413) 210-8823

NPI assigned

Jul 2, 2020

Last updated

Sep 10, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 10

Addresses

Medicare fee-for-service enrollment

Enrolled in CA, MD, DC, MO, IA, NY, CT, MA8 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 8

Specialty

Physician Assistant

Education

Other, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Physicians Medical Associates New York PCGroup PAC ID 7618310368, 100 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Grossmont Hospital Hospital, La Mesa, CA, CCN 050026
• Westchester Medical Center Hospital, Valhalla, NY, CCN 330234

Merit-based Incentive Payment System (MIPS)

Final score

96.69 of 100Reported as group

Quality

90

Improvement activities

40

Cost

78.43

Merit-based Incentive Payment System (MIPS)

Final score

87.3 of 100Reported as group

Quality

70.94

Improvement activities

40

Cost

92.94

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: michael.o.brien.1@24997.direct.athenahealth.com
• Direct secure messaging: mobrien4414723@direct.trinity-health.org

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Physicians Medical Associates New York PC

  • Emergency Medicine Physician
  • Syracuse, NY
  • NPI 1073386421
  Medicare reassignment Care Compare group
• Vituity-Iowa PLLC

  • Emergency Medicine Physician
  • Davenport, IA
  • NPI 1437932928
  Medicare reassignment NPD
• Vituity-Massachusetts PLLC

  • Emergency Medicine Physician
  • Springfield, MA
  • NPI 1083404313
  Medicare reassignment
• Alvarado Emergency Medical Associates, Inc.

  • Emergency Medicine Physician
  • San Diego, CA
  • NPI 1285811992
  Medicare reassignment
• Cep America - California

  dba Vituity

  • Emergency Medicine Physician
  • San Francisco, CA
  • NPI 1023063542
  Medicare reassignment
• Cep America - California

  dba Vituity

  • Emergency Medicine Physician
  • Santa Ana, CA
  • NPI 1548667843
  Medicare reassignment
• Cep America LLC

  dba Vituity

  • Emergency Medicine Physician
  • Washington, DC
  • NPI 1073914396
  Medicare reassignment
• Cep America LLC

  • Emergency Medicine Physician
  • Waterbury, CT
  • NPI 1700681202
  Medicare reassignment
• Cep America LLC

  dba Vituity

  • Emergency Medicine Physician
  • Baltimore, MD
  • NPI 1821434002
  Medicare reassignment
• Cep America, LLC

  dba Vituity

  • Emergency Medicine Physician
  • Saint Louis, MO
  • NPI 1619332046
  Medicare reassignment
• New York Physician Associates of Medicine PC

  • Emergency Medicine Physician
  • Valhalla, NY
  • NPI 1669329082
  Medicare reassignment
• Team Physicians of Northern California Medical Group Inc

  • Emergency Medicine Physician
  • Pleasanton, CA
  • NPI 1649692716
  Medicare reassignment

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

• Grossmont Hospital Corporation

  dba Sharp Grossmont Hospital

  • General Acute Care Hospital
  • La Mesa, CA
  • NPI 1528041811
  Care Compare affiliation
• Westchester County Health Care Corporation

  dba Westchester Medical Center

  • General Acute Care Hospital
  • Valhalla, NY
  • NPI 1932280666
  Care Compare affiliation

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

{
    "created_epoch": "1593648000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757462400000",
    "number": "1922625185",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "70 ACREBROOK DR",
            "city": "FLORENCE",
            "state": "MA",
            "postal_code": "010623421",
            "telephone_number": "413-210-8823"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "70 ACREBROOK DR",
            "city": "FLORENCE",
            "state": "MA",
            "postal_code": "010623421",
            "telephone_number": "413-210-8823"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "MICHAEL",
        "credential": "PA",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2020-07-02",
        "last_updated": "2025-09-10",
        "certification_date": "2025-09-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "DC",
            "license": "PA200001682",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "NY",
            "license": "031368",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MA",
            "license": "PA100930",
            "primary": true
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "IL",
            "license": "085010117",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "IA",
            "license": "123128",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MI",
            "license": "5601012132",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MO",
            "license": "2023043567",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MD",
            "license": "C08887",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "CT",
            "license": "7143",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "CA",
            "license": "PA58546",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Physician Assistant in Florence, MA
• Providers in Florence, MA by specialty
• Physician Assistant in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 10, 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.