Quick answers
- Which hospitals does Jeffrey D. Griesing work at?
- Medicare's official clinician data lists Jeffrey D. Griesing at 1 hospital: North Shore University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jeffrey D. Griesing see patients?
- Medicare's clinician data lists 8 practice locations, including New Hyde Park, NY, Syosset, NY and Manhasset, NY. Call before your visit to confirm the address.
- What is Jeffrey D. Griesing's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Jeffrey D. Griesing accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey D. Griesing 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 Jeffrey D. Griesing?
- (516) 496-6558, as listed in official Medicare / NPI Registry data.
- What is Jeffrey D. Griesing's NPI number?
- 1811907611. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jeffrey D. Griesing works
Medicare's Facility Affiliation Data lists Jeffrey D. Griesing at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- North Shore University HospitalManhasset, NY · Acute Care Hospital · CCN 330106
Practice locations
Addresses where Jeffrey D. Griesing is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 1111 Marcus AveNew Hyde Park, NY 11042
- 221 Jericho TpkeSyosset, NY 11791
- 221 Jericho Tpke, Suite 3Syosset, NY 11791 (516) 496‑6558
- 221 Jericho TurnpikeSyosset, NY 11791 (516) 496‑6500
- 300 Community DrManhasset, NY 11030
Group practices
Medicare enrollment lists Jeffrey D. Griesing as a member of this group (CMS data updated 2026-10-02).
- North Shore-Lij Medical PC6,440 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in New Hyde Park
Clinicians with the same Medicare primary specialty in New Hyde Park, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811907611 |
| 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