Quick answers
- Which hospitals does Allyson P. Marchan work at?
- Medicare's official clinician data lists Allyson P. Marchan at 1 hospital: John T Mather Memorial Hospital of Port Jefferson. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Allyson P. Marchan see patients?
- Medicare's clinician data lists 6 practice locations, including Manhasset, NY and Port Jefferson, NY. Call before your visit to confirm the address.
- What is Allyson P. Marchan's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Allyson P. Marchan accept Medicare assignment?
- Yes. Medicare's clinician data says Allyson P. Marchan 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 Allyson P. Marchan?
- (516) 562-2229, as listed in official Medicare / NPI Registry data.
- What is Allyson P. Marchan's NPI number?
- 1639691033. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Allyson P. Marchan works
Medicare's Facility Affiliation Data lists Allyson P. Marchan 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
Practice locations
Addresses where Allyson P. Marchan is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 300 Community DrManhasset, NY 11030
- 300 Community Dr LlManhasset, NY 11030 (516) 562‑2229
- 330 Community DrManhasset, NY 11030 (516) 708‑2550
- 350 Community DrManhasset, NY 11030 (516) 562‑3845
- 70 N Country RdPort Jefferson, NY 11777 (631) 642‑0609
Group practices
Medicare enrollment lists Allyson P. Marchan 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 Manhasset
Clinicians with the same Medicare primary specialty in Manhasset, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639691033 |
| 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