Quick answers
- Which hospitals does Anthony J. Massimillo work at?
- Medicare's official clinician data lists Anthony J. Massimillo at 2 hospitals: North Shore University Hospital and NYU Langone Hospitals. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Anthony J. Massimillo see patients?
- Medicare's clinician data lists 1 practice location in Mineola, NY. Call before your visit to confirm the address.
- What is Anthony J. Massimillo's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Anthony J. Massimillo accept Medicare assignment?
- Yes. Medicare's clinician data says Anthony J. Massimillo 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 Anthony J. Massimillo?
- (516) 294-9380, as listed in official Medicare / NPI Registry data.
- What is Anthony J. Massimillo's NPI number?
- 1043277692. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Anthony J. Massimillo works
Medicare's Facility Affiliation Data lists Anthony J. Massimillo 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
- NYU Langone HospitalsNew York, NY · Acute Care Hospital · CCN 330214
Practice locations
Addresses where Anthony J. Massimillo is enrolled with Medicare (CMS data updated 2026-10-02).
- 300 Old Country Rd, Suite 31Mineola, NY 11501 (516) 294‑9380
Group practices
Medicare enrollment lists Anthony J. Massimillo as a member of this group (CMS data updated 2026-10-02).
- North Shore-Lij Medical PC6,440 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Mineola
Clinicians with the same Medicare primary specialty in Mineola, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1043277692 |
| 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