Quick answers
- Which hospitals does Kostas Sideridis work at?
- Medicare's official clinician data lists Kostas Sideridis at 3 hospitals: Long Island Jewish Medical Center, North Shore University Hospital and Plainview Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Kostas Sideridis see patients?
- Medicare's clinician data lists 5 practice locations, including Syosset, NY, Manhasset, NY and Plainview, NY. Call before your visit to confirm the address.
- What is Kostas Sideridis's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Kostas Sideridis accept Medicare assignment?
- Yes. Medicare's clinician data says Kostas Sideridis 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.
- Does Kostas Sideridis offer telehealth?
- Medicare's clinician data says Kostas Sideridis offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Kostas Sideridis?
- (516) 584-6400, as listed in official Medicare / NPI Registry data.
- What is Kostas Sideridis's NPI number?
- 1003913682. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Kostas Sideridis works
Medicare's Facility Affiliation Data lists Kostas Sideridis 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
- North Shore University HospitalManhasset, NY · Acute Care Hospital · CCN 330106
- Plainview HospitalPlainview, NY · Acute Care Hospital · CCN 330331
Practice locations
Addresses where Kostas Sideridis is enrolled with Medicare (CMS data updated 2026-10-02).
- 121 Eileen WaySyosset, NY 11791 (516) 584‑6400
- 221 Jericho TpkeSyosset, NY 11791 (516) 584‑6400
- 237 Jericho TpkeSyosset, NY 11791 (516) 584‑6400
- 300 Community DrManhasset, NY 11030 (516) 584‑6400
- 888 Old Country RdPlainview, NY 11803 (516) 584‑6400
Group practices
Medicare enrollment lists Kostas Sideridis as a member of this group (CMS data updated 2026-10-02).
- Long Island Medical PC4 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Syosset
Clinicians with the same Medicare primary specialty in Syosset, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York College Of Osteo Medicine Of New York Institute Of Technology |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1003913682 |
| 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