Quick answers
- Which hospitals does Alexandra C. Marcy work at?
- Medicare's official clinician data lists Alexandra C. Marcy at 1 hospital: Mount Sinai South Nassau. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alexandra C. Marcy see patients?
- Medicare's clinician data lists 1 practice location in Oceanside, NY. Call before your visit to confirm the address.
- What is Alexandra C. Marcy's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Alexandra C. Marcy accept Medicare assignment?
- Yes. Medicare's clinician data says Alexandra C. Marcy 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 Alexandra C. Marcy?
- (877) 768-8462, as listed in official Medicare / NPI Registry data.
- What is Alexandra C. Marcy's NPI number?
- 1992381370. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alexandra C. Marcy works
Medicare's Facility Affiliation Data lists Alexandra C. Marcy at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · CCN 330198
Practice locations
Addresses where Alexandra C. Marcy is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Healthy WayOceanside, NY 11572 (877) 768‑8462
Group practices
Medicare enrollment lists Alexandra C. Marcy as a member of this group (CMS data updated 2026-10-02).
- Mount Sinai School of Medicine148 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Oceanside
Clinicians with the same Medicare primary specialty in Oceanside, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York Medical College |
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992381370 |
| 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