Theofanis Tsiamtsiouris, MD
NPI 1306897541ActiveIndividual· Internal Medicine, Interventional Cardiology· Roslyn, NY
Internal Medicine, Interventional Cardiology (MD) in Roslyn, New York, trained at State University of New York at Stony Brook, School of Medicine (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $1,799,664 for 9,553 claims, against $354,458 paid for services in 2024. Novartis Pharmaceuticals Corporation was the largest of 6 companies reporting payments in 2025, $474.65 in all, mostly food and beverage.
Overview
| NPI | 1306897541 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 12, 2006 |
| Last updated in NPPES | Oct 3, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | 1984011 | NY |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 1984011 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Interventional Cardiology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,363 |
|---|---|
| Services billed | 4,923 across 41 procedure codes |
| Paid by Medicare | $354,458 |
Part D prescriptions in 2024
| Prescriptions (claims) | 9,553 · 25,921 30-day fills |
|---|---|
| Patients | 1,150 |
| Total drug cost | $1,799,664 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | State University of New York at Stony Brook, School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Interventional Cardiology |
| Secondary specialties | Cardiovascular Disease (Cardiology), Internal Medicine |
Medical group
- Chs Physician Partners PCRoslyn, NY · 743 clinicians
Hospital affiliations
- Good Samaritan Hospital Medical CenterWest Islip, NY
- Mercy Medical CenterRockville Centre, NY
- St Francis Hospital - the Heart CenterRoslyn, NY
Other facilities
- Catholic Home CareHome health agency · Farmingdale, NY
Industry payments (Open Payments)
- 2025$474.65 · 52 payments from 6 companies
- 2024$590.71 · 33 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $288.25 | 43 |
| Novo Nordisk Inc | $76.48 | 3 |
| E.R. Squibb & Sons, L.L.C. | $40.49 | 2 |
| Abbott Laboratories | $36.61 | 2 |
| Esperion Therapeutics, Inc. | $18.49 | 1 |
What the 2025 payments were for
- Food and Beverage$474.65 · 52 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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