Quick answers
- Which hospitals does Margaret Hallowell work at?
- Medicare's official clinician data lists Margaret Hallowell at 2 hospitals: Chsli St Joseph Hospital and St Francis Hospital - The Heart Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Margaret Hallowell see patients?
- Medicare's clinician data lists 2 practice locations, including Roslyn, NY and Massapequa, NY. Call before your visit to confirm the address.
- What is Margaret Hallowell's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Margaret Hallowell accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret Hallowell 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.
- Does Margaret Hallowell offer telehealth?
- Medicare's clinician data says Margaret Hallowell offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Margaret Hallowell?
- (516) 795-2626, as listed in official Medicare / NPI Registry data.
- What is Margaret Hallowell's NPI number?
- 1649465865. 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 Hallowell works
Medicare's Facility Affiliation Data lists Margaret Hallowell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Chsli St Joseph HospitalBethpage, NY · Acute Care Hospital · CCN 330332
- St Francis Hospital - The Heart CenterRoslyn, NY · Acute Care Hospital · CCN 330182
Practice locations
Addresses where Margaret Hallowell is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Port Washington BlvdRoslyn, NY 11576
- 510 Hicksville RdMassapequa, NY 11758 (516) 795‑2626
Group practices
Medicare enrollment lists Margaret Hallowell as a member of this group (CMS data updated 2026-10-02).
- CHS Physician Partners PC743 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Roslyn
Clinicians with the same Medicare primary specialty in Roslyn, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1986 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1649465865 |
| 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