DR. GREGORY C KARNAZE (MD) – Vascular & Interventional Radiology Physician, NPI 1245233519
Vascular & Interventional Radiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
450 INTERVENTIONAL RADIOLOGY in TX
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Provider Addresses for DR. GREGORY C KARNAZE (MD)
12554, Riata Vista Circle, Apple, Austin, Travis County, Texas, 78727, United States
AUSTIN, TX 787276431
Phone: (512) 795-5100
Fax: (512) 795-5122
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 3 Open Payments records for all available years, with a total value of $424.
Total Amount is formed as General ($424) + Research ($0) + Ownership ($0) = $424.
Last reported payment date: 2024-08-06 • Largest payer in this snapshot: Penumbra, Inc. ($254).
Total Amount
$424
General + Research + Ownership
Payments
3
Total payment records
General Amount
$424
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-06
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Penumbra, Inc. | $254 |
| Boston Scientific Corporation | $169 |
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: 2009-06-18
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
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 |
|---|---|---|---|---|
| I20090618000130 | I | Interventional Radiology | TX | 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 |
|---|---|---|---|---|
| Q9967 | Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 975 | 12 | $0 |
| 71045 | X-ray of chest, 1 view | 740 | 621 | $0 |
| 71046 | X-ray of chest, 2 views | 314 | 308 | $0 |
| 74177 | Ct scan of abdomen and pelvis with contrast | 102 | 100 | $0 |
| 74018 | X-ray of abdomen, 1 view | 91 | 87 | $0 |
Insurance plans in this area (ZIP 78727)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INTERVENTIONAL RADIOLOGY | TX | 71250 | CT scan chest | 28 | 28 |
| INTERVENTIONAL RADIOLOGY | TX | 73562 | X-ray of knee, 3 views | 17 | 17 |
| INTERVENTIONAL RADIOLOGY | TX | 74177 | CT scan of abdomen and pelvis with contrast | 34 | 34 |
| INTERVENTIONAL RADIOLOGY | TX | 78815 | Nuclear medicine study with CT imaging skull base to mid-thigh | 23 | 23 |
| INTERVENTIONAL RADIOLOGY | TX | 93971 | Ultrasound scan of veins of one arm or leg or limited including assessment of compression and functional maneuvers | 29 | 29 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Diagnostic Radiology | IA | |
| Interventional Radiology, Diagnostic Radiology | LA | |
| Diagnostic Radiology | TX | |
| Diagnostic Radiology | TX | |
| - | TX | |
| Interventional Cardiology, Diagnostic Radiology | TX | |
| - | TX | |
| Interventional Radiology, Diagnostic Radiology | PA | |
| Diagnostic Radiology | OK | |
| Diagnostic Radiology | TX |
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