Quick answers
- Which hospitals does Casey O'Brien work at?
- Medicare's official clinician data lists Casey O'Brien at 2 hospitals: Northwestern Medical Center Inc and Univ. of Vermont - Fletcher Allen Health Care. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Casey O'Brien see patients?
- Medicare's clinician data lists 2 practice locations, including Williston, VT and Essex Junction, VT. Call before your visit to confirm the address.
- What is Casey O'Brien's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Casey O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Casey O'Brien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Casey O'Brien?
- (802) 878-1008, as listed in official Medicare / NPI Registry data.
- What is Casey O'Brien's NPI number?
- 1073133484. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Casey O'Brien works
Medicare's Facility Affiliation Data lists Casey O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northwestern Medical Center IncSaint Albans, VT · Acute Care Hospital · CCN 470024
- Univ. of Vermont - Fletcher Allen Health CareBurlington, VT · Acute Care Hospital · CCN 470003
Practice locations
Addresses where Casey O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 426 Industrial Ave, Suite 130Williston, VT 05495 (802) 878‑1008
- 8 Essex Way, 201 Dba Alderbrook Family HealthEssex Junction, VT 05452 (802) 872‑7100
Group practices
Medicare enrollment lists Casey O'Brien as a member of this group (CMS data updated 2026-10-02).
- Evergreen Family Health Partners20 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Williston
Clinicians with the same Medicare primary specialty in Williston, VT — not a recommendation.
Clinician information
| Graduation year | 2020 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1073133484 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians