DR. MARGARET SAGSVEEN D.O.
NPI 1073054375
Anesthesiology in Bay Shore, NY
About Dr. Margaret Sagsveen D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARGARET SAGSVEEN D.O. (NPI 1073054375) is an individual anesthesiology provider in Bay Shore, New York, licensed in New York (310231-01) and active in the NPI registry since March 2017. She is enrolled in Medicare PECOS, is affiliated with Ns/lij Hs Southside Hospital, and maintains a secondary practice location in Bronx.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Secondary Practice Location 1
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
Dr. Margaret Sagsveen D.o. 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 Reassignments
2Medicare enrollment records show Margaret Sagsveen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bronx, NY 10467
- Reassigned Medicare billing, New York enrollment
- 5,251 clinicians in this Medicare group
Chappaqua, NY 10514
- Reassigned Medicare billing, New York enrollment
- 1,406 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.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ns/Lij Hs Southside Hospital
Acute Care Hospitals · Bay Shore, NYNorth Shore University Hospital
Acute Care Hospitals · Manhasset, NYMedicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
BAY SHORE, NY 11706
BAY SHORE, NY 11706
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 Margaret Sagsveen's NPI number?
The NPI number for Margaret Sagsveen is 1073054375. It was assigned to this individual provider in the NPPES registry on March 20, 2017. The provider is also known as Dr. Margaret Myones.
Where is Margaret Sagsveen located?
Margaret Sagsveen practices at 301 E Main St, Bay Shore, NY 11706. The listed phone number is (631) 885-3885.
What is Margaret Sagsveen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Margaret Sagsveen enrolled in Medicare?
Yes. Margaret Sagsveen 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 organizations bill Medicare for Margaret Sagsveen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Sagsveen reassigns Medicare benefits to 2 organizations: Montefiore Medical Center (Bronx, NY) and North Shore - Lij Anesthesiology, PC (Chappaqua, NY). Each 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 Margaret Sagsveen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Margaret Sagsveen affiliated with any hospitals?
According to CMS data, Margaret Sagsveen is affiliated with Ns/Lij Hs Southside Hospital and North Shore University Hospital.
When was this NPI record last updated?
The NPPES record for Margaret Sagsveen was last updated on December 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Dr. Margaret Sagsveen, D.O. · NPI 1073054375
Anesthesiology physician in Bay Shore, New York. Individual provider, active in the CMS NPPES registry since March 20, 2017.
## Identity
- **NPI:** 1073054375 (Entity type: Individual)
- **Enumerated:** March 20, 2017
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 310231-01 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 301 E MAIN ST, Bay Shore, NY 11706-8408
- **Phone:** (631) 885-3885
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Montefiore Medical Center (NPI 1063525152, Bronx, NY); North Shore - Lij Anesthesiology, PC (NPI 1417401266, Chappaqua, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2017
## Record status
- **NPPES last updated:** December 2, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1073054375) · Data from the CMS NPPES public registry.