Leonidas G. Vassilaros, M.D.
NPI 1104897941ActiveIndividual· Internal Medicine, Nephrology· Youngstown, OH
Internal Medicine, Nephrology (M.D.) with The Kidney Group Inc, practicing in Youngstown, Ohio. Their prescriptions cost Medicare Part D more than their services did: $32,971 for 465 claims, against $5,391 paid for services in 2024. Otsuka America Pharmaceutical, Inc. was the largest of 10 companies reporting payments in 2025, $333.25 in all, mostly food and beverage. Lists Hmhp St Elizabeth Boardman Health Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1104897941 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 30, 2006 |
| Last updated in NPPES | Apr 3, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 35052890V | OH |
| Internal Medicine, Nephrology | 207RN0300X | MD039853L | PA |
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 - Nephrology (OH); Practitioner - Nephrology (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 54 |
|---|---|
| Services billed | 95 across 3 procedure codes |
| Paid by Medicare | $5,391 |
Part D prescriptions in 2024
| Prescriptions (claims) | 465 · 941 30-day fills |
|---|---|
| Patients | 54 |
| Total drug cost | $32,971 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Nephrology |
Medical group
- The Kidney Group IncNew Castle, PA · 21 clinicians
Hospital affiliations
- Hmhp St Elizabeth Boardman Health CenterBoardman, OH
- Mh St Elizabeth Youngstown HospitalYoungstown, OH
- Upmc HorizonGreenville, PA
Industry payments (Open Payments)
- 2025$333.25 · 18 payments from 10 companies
- 2024$371.66 · 18 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | $78.27 | 3 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $72.96 | 6 |
| Bayer Healthcare Pharmaceuticals Inc. | $51.32 | 2 |
| Novo Nordisk Inc | $31.00 | 1 |
| Astrazeneca Pharmaceuticals LP | $27.52 | 1 |
What the 2025 payments were for
- Food and Beverage$333.25 · 18 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 nephrologists in Youngstown · All nephrologists in Ohio