Casey M O'Brien, PA-C

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

055.0031747 Issued in VT

Practice address

426 Industrial Ave Ste 130
Williston, VT 05495-4449

Phone

(802) 878-1175

Fax

(802) 652-5355

NPI assigned

Apr 26, 2020

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in VT

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

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

Practice roles

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.

• Evergreen Family Health Partners

  • Family Medicine Physician
  • Williston, VT
  • NPI 1588790562
  Medicare reassignment
• Alder Brook Family Health P.C.

  • Family Medicine Physician
  • Essex Junction, VT
  • NPI 1952332124
  NPD (past)

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

{
    "created_epoch": "1587859200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768262400000",
    "number": "1073133484",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "426 INDUSTRIAL AVE STE 130",
            "city": "WILLISTON",
            "state": "VT",
            "postal_code": "054954449",
            "telephone_number": "802-878-1175",
            "fax_number": "802-652-5355"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "426 INDUSTRIAL AVE STE 130",
            "city": "WILLISTON",
            "state": "VT",
            "postal_code": "054954449",
            "telephone_number": "802-878-1175",
            "fax_number": "802-652-5355"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "CASEY",
        "middle_name": "M",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-04-26",
        "last_updated": "2026-01-13",
        "certification_date": "2026-01-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "VT",
            "license": "055.0031747",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Krista Roxann Nickerson, CNM
• Maria C Nolan
• Zachary Nollet, PA-C
• Deana Marie Novembrino, MS, RD, CD
• Mirsada Nurkanovic, DNP, FNP
• Rachel D. Oblak, MA
• Michelle Obrien, PT
• Onebreath Vermont PLLC
• Optum Behavioral Care of Delaware, Inc.
• Argjenta Orana, O.D.

• Physician Assistant in Williston, VT
• Providers in Williston, VT by specialty
• Physician Assistant in Vermont

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 13, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.