Quick answers
- Which hospitals does Margaret E. Treanor work at?
- Medicare's official clinician data lists Margaret E. Treanor at 3 hospitals: Hudson Valley Hospital Center, Northern Westchester Hospital and Putnam Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Margaret E. Treanor see patients?
- Medicare's clinician data lists 1 practice location in Smithtown, NY. Call before your visit to confirm the address.
- What is Margaret E. Treanor's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Margaret E. Treanor accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret E. Treanor 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 Margaret E. Treanor?
- (631) 751-3000, as listed in official Medicare / NPI Registry data.
- What is Margaret E. Treanor's NPI number?
- 1972174662. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Margaret E. Treanor works
Medicare's Facility Affiliation Data lists Margaret E. Treanor at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Hudson Valley Hospital CenterCortlandt Manor, NY · Acute Care Hospital · CCN 330267
- Northern Westchester HospitalMount Kisco, NY · Acute Care Hospital · CCN 330162
- Putnam Hospital CenterCarmel, NY · Acute Care Hospital · CCN 330273
Practice locations
Addresses where Margaret E. Treanor is enrolled with Medicare (CMS data updated 2026-10-02).
- 48 Route 25aSmithtown, NY 11787 (631) 751‑3000
Group practices
Medicare enrollment lists Margaret E. Treanor as a member of this group (CMS data updated 2026-10-02).
- North Shore Hematology Oncology Associates PC479 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Smithtown
Clinicians with the same Medicare primary specialty in Smithtown, NY — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1972174662 |
| 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