Oscar H. Grandas, MD
NPI 1366550014ActiveIndividual· Surgery, Vascular Surgery· Knoxville, TN
Surgery, Vascular Surgery (MD) with University Health System, Inc., practicing in Knoxville, Tennessee. 614 Medicare patients in 2024, $111,549 paid; nearly all of their 2,825 Part D prescriptions were generic (93%). Medtronic, Inc. was the largest of 6 companies reporting payments in 2025, $225.81 in all, mostly food and beverage. Lists Parkwest Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1366550014 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Aug 25, 2006 |
| Last updated in NPPES | Jun 6, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery, Vascular Surgery Primary | 2086S0129X | 38851 | TN |
| Transplant Surgery | 204F00000X | 38851 | TN |
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 - Vascular Surgery (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 614 |
|---|---|
| Services billed | 1,160 across 88 procedure codes |
| Paid by Medicare | $111,549 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,825 · 4,561 30-day fills |
|---|---|
| Patients | 279 |
| Total drug cost | $149,567 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 1986 |
|---|---|
| Medicare specialty | Vascular Surgery |
Medical group
- University Health System, Inc.Knoxville, TN · 522 clinicians
Hospital affiliations
- Parkwest Medical CenterKnoxville, TN
- University Health System, IncKnoxville, TN
Industry payments (Open Payments)
- 2025$225.81 · 8 payments from 6 companies
- 2024$118.59 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $78.17 | 3 |
| Humacyte Global, Inc. | $44.50 | 1 |
| Endologix LLC | $38.00 | 1 |
| Merck Sharp & Dohme LLC | $23.60 | 1 |
| Abbott Laboratories | $23.27 | 1 |
What the 2025 payments were for
- Food and Beverage$225.81 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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