Quick answers
- Which hospitals does Robert J. Mascarelli work at?
- Medicare's official clinician data lists Robert J. Mascarelli at 4 hospitals: Chsli St Joseph Hospital, Good Samaritan Hospital Medical Center, Ns/Lij HS Huntington Hospital and St Catherine of Siena Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Robert J. Mascarelli see patients?
- Medicare's clinician data lists 7 practice locations, including West Islip, NY, Huntington, NY and Manhasset, NY. Call before your visit to confirm the address.
- What is Robert J. Mascarelli's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Robert J. Mascarelli accept Medicare assignment?
- Medicare's clinician data says Robert J. Mascarelli may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Robert J. Mascarelli?
- (516) 414-4012, as listed in official Medicare / NPI Registry data.
- What is Robert J. Mascarelli's NPI number?
- 1932145687. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Robert J. Mascarelli works
Medicare's Facility Affiliation Data lists Robert J. Mascarelli at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Chsli St Joseph HospitalBethpage, NY · Acute Care Hospital · CCN 330332
- Good Samaritan Hospital Medical CenterWest Islip, NY · Acute Care Hospital · CCN 330286
- Ns/Lij HS Huntington HospitalHuntington, NY · Acute Care Hospital · CCN 330045
- St Catherine of Siena HospitalSmithtown, NY · Acute Care Hospital · CCN 330401
Practice locations
Addresses where Robert J. Mascarelli is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 1000 Montauk HwyWest Islip, NY 11795 (516) 414‑4012
- 270 Park AveHuntington, NY 11743 (631) 351‑2356
- 270 Park Ave, Suite 1Huntington, NY 11743 (631) 351‑2219
- 300 Community DrManhasset, NY 11030
- 300 Community Dr LlManhasset, NY 11030 (516) 562‑2229
Group practices
Medicare enrollment lists Robert J. Mascarelli as a member of these groups (CMS data updated 2026-10-02).
- North Shore-Lij Medical PC6,440 clinicians in the group
- Physician Assistant Associate PLLC16 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in West Islip
Clinicians with the same Medicare primary specialty in West Islip, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Medical school | State University Of New York At Stony Brook, School Of Medicine |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1932145687 |
| 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