MOUNT SINAI MARATHON MEDICAL - ONCOLOGY
Medicare Clinicians for NPI 1013484039
Internal Medicine - Hematology & Oncology in Rockville Centre, NY
Clinicians Billing Medicare Through This Organization CMS
Clinicians who reassign their Medicare billing to this organization, per CMS enrollment records.
Mount Sinai Marathon Medical - Oncology in Rockville Centre, NY bills Medicare for 301 clinicians across 27 Medicare specialties. The largest specialties are Internal Medicine with 45, Nurse Practitioner with 45 and Family Practice with 31. Of these, 7 practice at this address and 193 within 10 miles. Search by name or filter by specialty; each name links to that clinician's NPI profile.
This page lists the 250 clinicians practicing nearest to this organization's location. All 301 are counted in the totals above.
Nurse Practitioner (40 of 45)
Internal Medicine (34 of 45)
Oceanside, NY 11572
Family Practice (28 of 31)
Oceanside, NY 11572
New York, NY 10065
Pediatric Medicine (17 of 20)
Cardiovascular Disease (Cardiology) (16 of 18)
Oceanside, NY 11572
Oceanside, NY 11572
Mineola, NY 11501
General Surgery (14 of 16)
East Meadow, NY 11554
Hospitalist (14 of 22)
Rockville Centre, NY 11570
Pathology (13 of 14)
Oceanside, NY 11572
Oceanside, NY 11572
New York, NY 10029
Gastroenterology (12 of 14)
Neurology (11 of 17)
New York, NY 10029
Hematology/Oncology (10 of 11)
Rockville Centre, NY 11570
Rockville Centre, NY 11570
Rockville Centre, NY 11570
Obstetrics/Gynecology (10 of 13)
Urology (6)
Radiation Oncology (4)
Oceanside, NY 11572
Endocrinology (3)
Critical Care (Intensivists) (2 of 3)
Hospice/Palliative Care (2)
Infectious Disease (2)
Bethpage, NY 11714
Physical Medicine and Rehabilitation (2)
Pulmonary Disease (2)
Vascular Surgery (2 of 4)
Cardiac Electrophysiology (1)
Emergency Medicine (1)
Geriatric Medicine (1 of 2)
Gynecological Oncology (1)
Nephrology (1)
Psychiatry (1)
Brooklyn, NY 11212
About this data
Medicare reassignment. A clinician who works for a hospital, clinic or medical group usually signs a Medicare reassignment (form CMS-855R). It lets the organization bill Medicare for the clinician's services and receive the payment. This page lists the clinicians whose reassignment to Mount Sinai Marathon Medical - Oncology appears in the CMS Revalidation Reassignment List.
Who is included. Clinicians who bill Medicare under their own NPI through this organization. A clinician can reassign to more than one organization, so the same name may also appear under other groups.
Nearest 250. The totals and specialty counts cover all 301 clinicians. The list shows the 250 whose practice address is closest to this NPI's location, so each Mount Sinai Marathon Medical - Oncology location shows its own nearest clinicians.
Addresses and phone numbers come from each clinician's own NPPES record, so they may point to another office or to the clinician's own practice.
Source: CMS Revalidation Reassignment List, October 2026 release; addresses, phone numbers and Medicare status from NPPES and PECOS. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.