Quick answers
- Which hospitals does Louis J. Avvento work at?
- Medicare's official clinician data lists Louis J. Avvento at 1 hospital: Suny/Stony Brook University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Louis J. Avvento see patients?
- Medicare's clinician data lists 1 practice location in Southampton, NY. Call before your visit to confirm the address.
- What is Louis J. Avvento's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Hematology/Oncology.
- Does Louis J. Avvento accept Medicare assignment?
- Yes. Medicare's clinician data says Louis J. Avvento 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.
- Does Louis J. Avvento offer telehealth?
- Medicare's clinician data says Louis J. Avvento offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Louis J. Avvento?
- (631) 751-3000, as listed in official Medicare / NPI Registry data.
- What is Louis J. Avvento's NPI number?
- 1417999533. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Louis J. Avvento works
Medicare's Facility Affiliation Data lists Louis J. Avvento at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Suny/Stony Brook University HospitalStony Brook, NY · Acute Care Hospital · CCN 330393
Practice locations
Addresses where Louis J. Avvento is enrolled with Medicare (CMS data updated 2026-10-02).
- 640 Country Rd, Suite 39Southampton, NY 11968 (631) 751‑3000
Group practices
Medicare enrollment lists Louis J. Avvento as a member of this group (CMS data updated 2026-10-02).
- North Shore Hematology Oncology Associates PC479 clinicians in the group
Specialties
- Medical Oncologyprimary
- Hematology/Oncologyalso
Other oncologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1417999533 |
| 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