Quick answers
- Which hospitals does Sydney S. Yoon work at?
- Medicare's official clinician data lists Sydney S. Yoon at 5 hospitals: Long Island Jewish Medical Center, Mercy Medical Center, Mount Sinai Hospital, Mount Sinai South Nassau and NYU Langone Hospitals. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sydney S. Yoon see patients?
- Medicare's clinician data lists 3 practice locations, including Oceanside, NY and Wantagh, NY. Call before your visit to confirm the address.
- What is Sydney S. Yoon's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty, and also Interventional Radiology.
- Does Sydney S. Yoon accept Medicare assignment?
- Yes. Medicare's clinician data says Sydney S. Yoon 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 Sydney S. Yoon?
- (516) 632-4656, as listed in official Medicare / NPI Registry data.
- What is Sydney S. Yoon's NPI number?
- 1366425126. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sydney S. Yoon works
Medicare's Facility Affiliation Data lists Sydney S. Yoon at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Long Island Jewish Medical CenterNew Hyde Park, NY · Acute Care Hospital · CCN 330195
- Mercy Medical CenterRockville Centre, NY · Acute Care Hospital · CCN 330259
- 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
Practice locations
Addresses where Sydney S. Yoon is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Healthy WayOceanside, NY 11572 (516) 632‑4656
- 2020 Wantagh Ave, Mount Sinai Doctors WantaghWantagh, NY 11793 (516) 961‑4545
- 440 Merrick RdOceanside, NY 11572 (516) 632‑4656
Group practices
Medicare enrollment lists Sydney S. Yoon as a member of these groups (CMS data updated 2026-10-02).
- North Shore Medical Group of the Mount Sinai School of Medicine331 clinicians in the group
- Icahn School of Medicine at Mount Sinai20 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
- Interventional Radiologyalso
Other radiologists in Oceanside
Clinicians with the same Medicare primary specialty in Oceanside, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Chicago, Pritzker School Of Medicine |
| Graduation year | 1986 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366425126 |
| 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