Quick answers
- Where does Barbara Giannelli-O'Brien see patients?
- Medicare's clinician data lists 2 practice locations, including Centereach, NY and S Setauket, NY. Call before your visit to confirm the address.
- What is Barbara Giannelli-O'Brien's specialty?
- Medicare lists Clinical Social Worker as the primary specialty.
- Does Barbara Giannelli-O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Barbara Giannelli-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 Barbara Giannelli-O'Brien?
- (631) 751-1416, as listed in official Medicare / NPI Registry data.
- What is Barbara Giannelli-O'Brien's NPI number?
- 1144239484. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Barbara Giannelli-O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 3771 Nesconset Hwy, Suite 208aCentereach, NY 11720 (631) 751‑1416
- 3771 Nesconset Hwy, Suite 208aS Setauket, NY 11720
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Centereach
Clinicians with the same Medicare primary specialty in Centereach, NY — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Medical school | State University Of New York At Stony Brook, School Of Medicine |
| Graduation year | 1989 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144239484 |
| 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
- 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