Quick answers
- Which hospitals does Stephen D. Lazar work at?
- Medicare's official clinician data lists Stephen D. Lazar at 3 hospitals: Garnet Health Medical Center, Montefiore St Luke's Cornwall and Westchester Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Stephen D. Lazar see patients?
- Medicare's clinician data lists 6 practice locations, including Valhalla, NY, Cornwall, NY and Poughkeepsie, NY. Call before your visit to confirm the address.
- What is Stephen D. Lazar's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does Stephen D. Lazar accept Medicare assignment?
- Yes. Medicare's clinician data says Stephen D. Lazar 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 Stephen D. Lazar?
- (845) 561-4400, as listed in official Medicare / NPI Registry data.
- What is Stephen D. Lazar's NPI number?
- 1811990872. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Stephen D. Lazar works
Medicare's Facility Affiliation Data lists Stephen D. Lazar at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Garnet Health Medical CenterMiddletown, NY · Acute Care Hospital · CCN 330126
- Montefiore St Luke's CornwallNewburgh, NY · Acute Care Hospital · CCN 330264
- Westchester Medical CenterValhalla, NY · Acute Care Hospital · CCN 330234
Practice locations
Addresses where Stephen D. Lazar is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 100 Woods RdValhalla, NY 10595
- 19 Laurel AveCornwall, NY 12518 (845) 561‑4400
- 241 N RdPoughkeepsie, NY 12601 (845) 483‑5000
- 575 Hudson Valley AveNew Windsor, NY 12553
- 70 Dubois StNewburgh, NY 12550 (845) 561‑4400
Group practices
Medicare enrollment lists Stephen D. Lazar as a member of this group (CMS data updated 2026-10-02).
- Westchester Medical Center Advanced Physician Services PC897 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in New York →
Other cardiologists in Valhalla
Clinicians with the same Medicare primary specialty in Valhalla, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811990872 |
| 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