Quick answers
- Which hospitals does Leonard B. Stein work at?
- Medicare's official clinician data lists Leonard B. Stein at 2 hospitals: 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 Leonard B. Stein see patients?
- Medicare's clinician data lists 1 practice location in Uniondale, NY. Call before your visit to confirm the address.
- What is Leonard B. Stein's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Leonard B. Stein accept Medicare assignment?
- Yes. Medicare's clinician data says Leonard B. Stein 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 Leonard B. Stein?
- (516) 794-1868, as listed in official Medicare / NPI Registry data.
- What is Leonard B. Stein's NPI number?
- 1700990272. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Leonard B. Stein works
Medicare's Facility Affiliation Data lists Leonard B. Stein 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
Practice locations
Addresses where Leonard B. Stein is enrolled with Medicare (CMS data updated 2026-10-02).
- 106 Charles Lindbergh Blvd, Suite CUniondale, NY 11553 (516) 794‑1868
Group practices
Medicare enrollment lists Leonard B. Stein as a member of this group (CMS data updated 2026-10-02).
- Medical Services of Uniondale PC11 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Uniondale
Clinicians with the same Medicare primary specialty in Uniondale, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700990272 |
| 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