LEONIDAS G VASSILAROS (M.D.) – Nephrology Physician, NPI 1104897941
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
547 NEPHROLOGY in OH
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Provider Addresses for LEONIDAS G VASSILAROS (M.D.)
1340, Belmont Avenue, Arlington Heights, North Side, Youngstown, Mahoning County, Ohio, 44504, United States
SUITE 2300
YOUNGSTOWN, OH 445041125
Phone: (330) 746-1488
Fax: (330) 746-5611
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 39 Open Payments records for all available years, with a total value of $774.
Total Amount is formed as General ($774) + Research ($0) + Ownership ($0) = $774.
Last reported payment date: 2024-12-03 • Largest payer in this snapshot: Bayer Healthcare Pharmaceuticals Inc. ($74).
Total Amount
$774
General + Research + Ownership
Payments
39
Total payment records
General Amount
$774
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-03
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2012-04-13
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040524001440 | I | Nephrology | OH | TBD |
| I20120413000597 | I | Nephrology | PA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 62 | 45 | $0 |
Insurance plans in this area (ZIP 44504)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine, Nephrology | OH | |
| Nurse Practitioner | OH | |
| N E P H R O L O G Y | OH | |
| Nurse Practitioner | OH | |
| N E P H R O L O G Y | OH | |
| Physician Assistant | PA | |
| Internal Medicine | OH | |
| N E P H R O L O G Y | OH | |
| Nurse Practitioner | OH | |
| Internal Medicine | OH |
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