Quick answers
- Which hospitals does Cassandra O'Connor work at?
- Medicare's official clinician data lists Cassandra O'Connor at 1 hospital: St Francis Hospital - The Heart Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Cassandra O'Connor see patients?
- Medicare's clinician data lists 1 practice location in Roslyn, NY. Call before your visit to confirm the address.
- What is Cassandra O'Connor's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Cassandra O'Connor accept Medicare assignment?
- Yes. Medicare's clinician data says Cassandra O'Connor 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 Cassandra O'Connor?
- (516) 562-6385, as listed in official Medicare / NPI Registry data.
- What is Cassandra O'Connor's NPI number?
- 1184200289. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Cassandra O'Connor works
Medicare's Facility Affiliation Data lists Cassandra O'Connor at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Francis Hospital - The Heart CenterRoslyn, NY · Acute Care Hospital · CCN 330182
Practice locations
Addresses where Cassandra O'Connor is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Port Washington BlvdRoslyn, NY 11576 (516) 562‑6385
Group practices
Medicare enrollment lists Cassandra O'Connor as a member of this group (CMS data updated 2026-10-02).
- Southwest Suffolk Medical PC199 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Roslyn
Clinicians with the same Medicare primary specialty in Roslyn, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184200289 |
| 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