ALEXANDRA CASEY MARCY MD
NPI 1992381370
Family Medicine in Oceanside, NY
About Alexandra Casey Marcy Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDRA CASEY MARCY MD (NPI 1992381370) is an individual family medicine provider in Oceanside, New York, licensed in New York (336797) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS, is affiliated with Mount Sinai South Nassau, and is a graduate of New York Medical College (2021).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Alexandra Casey Marcy Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Alexandra Marcy reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oceanside, NY 11572
- Reassigned Medicare billing, New York enrollment
- 302 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mount Sinai South Nassau
Acute Care Hospitals · Oceanside, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11572 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OCEANSIDE, NY 11572
OCEANSIDE, NY 11572
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Alexandra Marcy's NPI number?
The NPI number for Alexandra Marcy is 1992381370. It was assigned to this individual provider in the NPPES registry on March 24, 2021.
Where is Alexandra Marcy located?
Alexandra Marcy practices at 1 Healthy Way, Oceanside, NY 11572. The listed phone number is (516) 632-3000.
What is Alexandra Marcy's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Alexandra Marcy enrolled in Medicare?
Yes. Alexandra Marcy is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Alexandra Marcy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexandra Marcy reassigns Medicare benefits to Mount Sinai School Of Medicine (Oceanside, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alexandra Marcy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alexandra Marcy affiliated with any hospitals?
According to CMS data, Alexandra Marcy is affiliated with Mount Sinai South Nassau.
When was this NPI record last updated?
The NPPES record for Alexandra Marcy was last updated on July 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Alexandra Casey Marcy, MD · NPI 1992381370
Family Medicine physician in Oceanside, New York. Individual provider, active in the CMS NPPES registry since March 24, 2021.
## Identity
- **NPI:** 1992381370 (Entity type: Individual)
- **Enumerated:** March 24, 2021
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 336797 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 HEALTHY WAY, Oceanside, NY 11572-1551
- **Phone:** (516) 632-3000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Mount Sinai School Of Medicine (NPI 1396212536, Oceanside, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York Medical College, class of 2021
## Record status
- **NPPES last updated:** July 29, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1992381370) · Data from the CMS NPPES public registry.