Quick answers
- Which hospitals does Karen E. Horwitz work at?
- Medicare's official clinician data lists Karen E. Horwitz at 5 hospitals: John T Mather Memorial Hospital of Port Jefferson, Long Island Jewish Medical Center, North Shore University Hospital, Ns/Lij HS Huntington Hospital and Ns/Lij HS Southside Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Karen E. Horwitz see patients?
- Medicare's clinician data lists 40 practice locations, including Riverhead, NY, New York, NY and Glen Cove, NY. Call before your visit to confirm the address.
- What is Karen E. Horwitz's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Karen E. Horwitz accept Medicare assignment?
- Yes. Medicare's clinician data says Karen E. Horwitz 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 Karen E. Horwitz?
- (631) 548-6000, as listed in official Medicare / NPI Registry data.
- What is Karen E. Horwitz's NPI number?
- 1790793560. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Karen E. Horwitz works
Medicare's Facility Affiliation Data lists Karen E. Horwitz at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- John T Mather Memorial Hospital of Port JeffersonPort Jefferson, NY · Acute Care Hospital · CCN 330185
- Long Island Jewish Medical CenterNew Hyde Park, NY · Acute Care Hospital · CCN 330195
- North Shore University HospitalManhasset, NY · Acute Care Hospital · CCN 330106
- Ns/Lij HS Huntington HospitalHuntington, NY · Acute Care Hospital · CCN 330045
- Ns/Lij HS Southside HospitalBay Shore, NY · Acute Care Hospital · CCN 330043
Practice locations
Addresses where Karen E. Horwitz is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 40; the Medicare profile lists all.
- 1 Heroes WayRiverhead, NY 11901 (631) 548‑6000
- 100 E 77th StNew York, NY 10075
- 101 Saint Andrews LnGlen Cove, NY 11542
- 101 Saint Andrews Ln, Suite 1Glen Cove, NY 11542 (516) 674‑1812
- 10201 66th RdForest Hills, NY 11375 (718) 830‑4000
Group practices
Medicare enrollment lists Karen E. Horwitz as a member of these groups (CMS data updated 2026-10-02).
- North Shore-Lij Medical PC6,440 clinicians in the group
- Southside Faculty Medical Affiliates University Faculty Practice Corp231 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Riverhead
Clinicians with the same Medicare primary specialty in Riverhead, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 1989 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790793560 |
| 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