Oscar Grandas, MD
NPI 1366550014 · Vascular Surgery Physician · Knoxville, TN
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oscar Grandas, MD is a Vascular Surgery Physician provider in Knoxville, TN (NPI 1366550014).
Provider details
- NPI number
- 1366550014
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 38851 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
896 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 96 | $86 |
| Ultrasound Study of Arm Or Leg Veins With Compression and Maneuvers93970 | 95 | $31 |
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 90 | $36 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 64 | $91 |
| Ultrasound of Leg Arteries Or Artery Grafts93925 | 58 | $35 |
| Ultrasound Study of Arm and Leg Arteries93922 | 54 | $11 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 449 | 77 |
| Famotidine | 286 | 55 |
| Amlodipine Besylate | 171 | 34 |
| Rosuvastatin Calcium | 169 | 40 |
| Pantoprazole Sodium | 109 | 21 |
| Carvedilol | 106 | 28 |
| Atorvastatin Calcium | 94 | 21 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$119 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-25
- Last updated
- 2018-06-06
Frequently asked questions
- What is Oscar Grandas's NPI number?
- Oscar Grandas's National Provider Identifier (NPI) is 1366550014, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oscar Grandas's specialty?
- Oscar Grandas is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Oscar Grandas located?
- Oscar Grandas's practice location on file with NPPES is 1940 Alcoa Hwy, Knoxville, TN 37920.
- What is Oscar Grandas's phone number?
- The practice phone number listed in the NPPES registry for Oscar Grandas is (865) 305-8040.
- Does Oscar Grandas accept Medicare?
- Oscar Grandas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oscar Grandas's NPI active?
- Yes — Oscar Grandas's NPI (1366550014) is active in the NPPES registry as of the last update on 2018-06-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.