Surgeon profile
John Grehan, MD PHD
Thoracic Surgery · Sioux Falls, SD 57105NPI 1275549784
Database refreshed July 2026Live NPPES registry· Industry payments CY2025ⓘ sources
Checking live NPPES registry…
Loading hospital affiliations…
Tracked procedure volumes
Latest federal claims release with year-over-year momentum. Eight device-heavy specialties tracked — more coming.
74 Medicare cases/yr
74 patients
1 procedure
| Procedure | Cases | Trend | Patients |
|---|---|---|---|
| TAVR — Transfemoral CPT 33361 | 74 | ▲ +196% | 74 |
Industry relationships
CMS Open Payments, CY2025 general payments (published June 2026) — who already pays this surgeon.
Pulling CY2025 industry payments + 7-year history…