Quick answers
- Which hospitals does Steven A. Greenstein work at?
- Medicare's official clinician data lists Steven A. Greenstein at 5 hospitals: Kings County Hospital Center, Mount Sinai Hospital, Mount Sinai South Nassau, NYU Langone Hospitals and St Francis Hospital - The Heart Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Steven A. Greenstein see patients?
- Medicare's clinician data lists 2 practice locations, including Oceanside, NY and Woodmere, NY. Call before your visit to confirm the address.
- What is Steven A. Greenstein's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Steven A. Greenstein accept Medicare assignment?
- Yes. Medicare's clinician data says Steven A. Greenstein accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Steven A. Greenstein?
- (877) 768-8462, as listed in official Medicare / NPI Registry data.
- What is Steven A. Greenstein's NPI number?
- 1417362245. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Steven A. Greenstein works
Medicare's Facility Affiliation Data lists Steven A. Greenstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kings County Hospital CenterBrooklyn, NY · Acute Care Hospital · CCN 330202
- Mount Sinai HospitalNew York, NY · Acute Care Hospital · CCN 330024
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · CCN 330198
- NYU Langone HospitalsNew York, NY · Acute Care Hospital · CCN 330214
- St Francis Hospital - The Heart CenterRoslyn, NY · Acute Care Hospital · CCN 330182
Practice locations
Addresses where Steven A. Greenstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Healthy WayOceanside, NY 11572 (877) 768‑8462
- 1050 Central AveWoodmere, NY 11598 (516) 614‑0070
Group practices
Medicare enrollment lists Steven A. Greenstein as a member of this group (CMS data updated 2026-10-02).
- Mount Sinai School of Medicine148 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in New York →
Other cardiologists in Oceanside
Clinicians with the same Medicare primary specialty in Oceanside, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417362245 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians