MARY KRISTINE ELLIS M.D.
NPI 1134447329
Family Medicine in Oceanside, NY
About Mary Kristine Ellis M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY KRISTINE ELLIS M.D. (NPI 1134447329) is an individual family medicine provider in Oceanside, New York, licensed in New York (277569) and active in the NPI registry since May 2010. She is enrolled in Medicare PECOS, is affiliated with Mount Sinai South Nassau, and maintains a secondary practice location in Hempstead.
NPPES Registry Identity
Specialties & Licenses 2
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
Mary Kristine Ellis M.d. 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
5Medicare enrollment records show Mary Ellis reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oceanside, NY 11572
- Reassigned Medicare billing, New York enrollment
- 302 clinicians in this Medicare group
Rockville Centre, NY 11570
- Reassigned Medicare billing, New York enrollment
- 596 clinicians in this Medicare group
Elmhurst, NY 11373
- Reassigned Medicare billing, New York enrollment
- 836 clinicians in this Medicare group
Brooklyn, NY 11237
- Reassigned Medicare billing, New York enrollment
- 427 clinicians in this Medicare group
New York, NY 10016
- Reassigned Medicare billing, New York enrollment
- 616 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
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 Mary Ellis's NPI number?
The NPI number for Mary Ellis is 1134447329. It was assigned to this individual provider in the NPPES registry on May 12, 2010.
Where is Mary Ellis located?
Mary Ellis practices at 196 Merrick Rd, Oceanside, NY 11572. The listed phone number is (516) 255-8400.
What is Mary Ellis's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mary Ellis enrolled in Medicare?
Yes. Mary Ellis 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 Mary Ellis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Ellis reassigns Medicare benefits to 5 organizations: Mount Sinai School Of Medicine (Oceanside, NY), City Medical Of Upper East Side, PLLC (Rockville Centre, NY), Icahn School Of Medicine At Mount Sinai (Elmhurst, NY), Wyckoff Professional Medical Services, PC (Brooklyn, NY) and Nyu Langone Hospitals (New York, 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 Mary Ellis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mary Ellis affiliated with any hospitals?
According to CMS data, Mary Ellis is affiliated with Mount Sinai South Nassau.
When was this NPI record last updated?
The NPPES record for Mary Ellis was last updated on December 6, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.
# Mary Kristine Ellis, M.D. · NPI 1134447329
Family Medicine physician in Oceanside, New York. Individual provider, active in the CMS NPPES registry since May 12, 2010.
## Identity
- **NPI:** 1134447329 (Entity type: Individual)
- **Enumerated:** May 12, 2010
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 277569 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 196 MERRICK RD, Oceanside, NY 11572-1420
- **Phone:** (516) 255-8400
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Mount Sinai School Of Medicine (NPI 1326515578, Oceanside, NY); City Medical Of Upper East Side, PLLC (NPI 1386055648, Rockville Centre, NY); Icahn School Of Medicine At Mount Sinai (NPI 1346721289, Elmhurst, NY); Wyckoff Professional Medical Services, PC (NPI 1659710796, Brooklyn, NY); Nyu Langone Hospitals (NPI 1790975944, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** December 6, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1134447329) · Data from the CMS NPPES public registry.