Quick answers
- Which hospitals does Gregory S. Timm work at?
- Medicare's official clinician data lists Gregory S. Timm at 5 hospitals: John T Mather Memorial Hospital of Port Jefferson, Lenox Hill Hospital, Long Island Jewish Medical Center, North Shore University Hospital and Northern Westchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory S. Timm see patients?
- Medicare's clinician data lists 4 practice locations, including Seaford, NY, Great Neck, NY and Manhasset, NY. Call before your visit to confirm the address.
- What is Gregory S. Timm's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Gregory S. Timm accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory S. Timm 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 Gregory S. Timm?
- (516) 266-3456, as listed in official Medicare / NPI Registry data.
- What is Gregory S. Timm's NPI number?
- 1861450611. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory S. Timm works
Medicare's Facility Affiliation Data lists Gregory S. Timm 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
- 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
- Northern Westchester HospitalMount Kisco, NY · Acute Care Hospital · CCN 330162
Practice locations
Addresses where Gregory S. Timm is enrolled with Medicare (CMS data updated 2026-10-02).
- 1220 Hicksville RdSeaford, NY 11783 (516) 266‑3456
- 170 Great Neck RdGreat Neck, NY 11021 (516) 487‑4464
- 300 Community DrManhasset, NY 11030 (516) 562‑3058
- 9525 Queens BlvdRego Park, NY 11374 (718) 360‑5522
Group practices
Medicare enrollment lists Gregory S. Timm 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
- Medical Services of Kips Bay PC15 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Seaford
Clinicians with the same Medicare primary specialty in Seaford, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1861450611 |
| 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