Cassandra Marie O'Connor, MD
NPI 1184200289ActiveIndividual· Internal Medicine· Roslyn, NY
Internal Medicine (MD) with Southwest Suffolk Medical PC, practicing in Roslyn, New York. In 2024 Medicare paid $63,919 for 261 patients, and Part D covered 352 of their prescriptions, 89% of them generic. Lists St Francis Hospital - the Heart Center as a hospital affiliation.
Overview
| NPI | 1184200289 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 20, 2021 |
| Last updated in NPPES | Aug 8, 2024 |
| Certified by provider | Aug 8, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 33108401 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 261 |
|---|---|
| Services billed | 807 across 7 procedure codes |
| Paid by Medicare | $63,919 |
Part D prescriptions in 2024
| Prescriptions (claims) | 352 · 640 30-day fills |
|---|---|
| Patients | 128 |
| Total drug cost | $23,248 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2020 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Southwest Suffolk Medical PCSmithtown, NY · 199 clinicians
Hospital affiliation
- St Francis Hospital - the Heart CenterRoslyn, NY
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 27 internal medicine physicians in Roslyn · All internal medicine physicians in New York