MOUNT SINAI MARATHON MEDICAL - GASTROENTEROLOGY
NPI 1356818553
Internal Medicine - Gastroenterology in Oceanside, NY
About Mount Sinai Marathon Medical - Gastroenterology NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MOUNT SINAI MARATHON MEDICAL - GASTROENTEROLOGY (NPI 1356818553) is a healthcare organization registered as a gastroenterology in Oceanside, New York and active in the NPI registry since October 2018. The organization maintains a secondary practice location in Oceanside and lists Alicia Gresham, Vp Network Operations, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 3
Other Names 1
Secondary Practice Location 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mount Sinai Marathon Medical - Gastroenterology is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
301Medicare enrollment records show 301 clinicians reassign Medicare billing to Mount Sinai Marathon Medical - Gastroenterology, which bills Medicare for the services they deliver. Of these, 186 practice within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 27
Nearest to this location (20)
See all 301Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Mount Sinai School Of Medicine's NPI number?
The NPI number for Mount Sinai School Of Medicine is 1356818553. It was assigned to this organization in the NPPES registry on October 26, 2018. The provider is also known as Mount Sinai Marathon Medical - Gastroenterology.
Where is Mount Sinai School Of Medicine located?
Mount Sinai School Of Medicine is located at 2965 Long Beach Rd, Oceanside, NY 11572. The listed phone number is (516) 992-5626.
What is Mount Sinai School Of Medicine's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Mount Sinai School Of Medicine enrolled in Medicare?
Yes. Mount Sinai School Of Medicine is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mount Sinai School Of Medicine?
According to the CMS Revalidation Reassignment List (October 2026 release), 301 clinicians in 27 Medicare specialties reassign their Medicare billing to Mount Sinai School Of Medicine. A 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 the clinician's services. The largest specialties are Internal Medicine (45), Nurse Practitioner (45) and Family Practice (31). Of these, 186 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Mount Sinai School Of Medicine was last updated on January 11, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Mount Sinai Marathon Medical - Gastroenterology · NPI 1356818553
Gastroenterology organization in Oceanside, New York. Organization record, active in the CMS NPPES registry since October 26, 2018.
## Identity
- **NPI:** 1356818553 (Entity type: Organization)
- **Enumerated:** October 26, 2018
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Legal business name:** Mount Sinai School Of Medicine
- **Organization subpart:** No
- **Authorized official:** Alicia Gresham, VP NETWORK OPERATIONS
## Practice location
- **Address:** 2965 LONG BEACH RD, Oceanside, NY 11572-3255
- **Phone:** (516) 992-5626
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 301 clinicians in 27 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Internal Medicine (45), Nurse Practitioner (45), Family Practice (31); 186 practice within 10 miles; [full list](https://npiprofile.com/npi/1356818553/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** January 11, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1356818553) · Data from the CMS NPPES public registry.