Quick answers
- Which hospitals does Caroline E. O'Brien work at?
- Medicare's official clinician data lists Caroline E. O'Brien at 1 hospital: Winchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Caroline E. O'Brien see patients?
- Medicare's clinician data lists 1 practice location in South Hamilton, MA. Call before your visit to confirm the address.
- What is Caroline E. O'Brien's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Caroline E. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Caroline E. 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 Caroline E. O'Brien?
- (978) 468-7381, as listed in official Medicare / NPI Registry data.
- What is Caroline E. O'Brien's NPI number?
- 1124828801. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Caroline E. O'Brien works
Medicare's Facility Affiliation Data lists Caroline E. O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Winchester HospitalWinchester, MA · Acute Care Hospital · CCN 220105
Practice locations
Addresses where Caroline E. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 15 Railroad AveSouth Hamilton, MA 01982 (978) 468‑7381
Group practices
Medicare enrollment lists Caroline E. O'Brien as a member of this group (CMS data updated 2026-10-02).
- Beth Israel Lahey Health Primary Care, Inc353 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in South Hamilton
Clinicians with the same Medicare primary specialty in South Hamilton, MA — not a recommendation.
Clinician information
| Graduation year | 2024 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1124828801 |
| 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