Quick answers
- Which hospitals does Nicholas Hornstein work at?
- Medicare's official clinician data lists Nicholas Hornstein at 3 hospitals: Lenox Hill Hospital, Long Island Jewish Medical Center and North Shore University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nicholas Hornstein see patients?
- Medicare's clinician data lists 1 practice location in New York, NY. Call before your visit to confirm the address.
- What is Nicholas Hornstein's specialty?
- Medicare lists Hematology/Oncology as the primary specialty, and also Internal Medicine.
- Does Nicholas Hornstein accept Medicare assignment?
- Yes. Medicare's clinician data says Nicholas Hornstein 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 Nicholas Hornstein offer telehealth?
- Medicare's clinician data says Nicholas Hornstein offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Nicholas Hornstein?
- (212) 434-4460, as listed in official Medicare / NPI Registry data.
- What is Nicholas Hornstein's NPI number?
- 1548764848. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nicholas Hornstein works
Medicare's Facility Affiliation Data lists Nicholas Hornstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Lenox Hill HospitalNew York, NY · Acute Care Hospital · CCN 330119
- Long Island Jewish Medical CenterNew Hyde Park, NY · Acute Care Hospital · CCN 330195
- North Shore University HospitalManhasset, NY · Acute Care Hospital · CCN 330106
Practice locations
Addresses where Nicholas Hornstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 210 E 64th St, Fl 4New York, NY 10065 (212) 434‑4460
Group practices
Medicare enrollment lists Nicholas Hornstein as a member of this group (CMS data updated 2026-10-02).
- North Shore Health System Medical Faculty Group Practice Inc164 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Internal Medicinealso
Other hematologist-oncologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Columbia University College Of Physicians And Surgeons |
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1548764848 |
| 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