Highest-Volume Diagnostic Cardiac Cath (Left Heart) Surgeons in Montana (2026 update)
28 Montana providers billed Medicare for Diagnostic Cardiac Cath (Left Heart) (CPT 93458) in 2024. The top 10 by case volume are below — the full ranked list, CSV export and competitor-payment intel are available with a DocVol subscription ($199/mo, cancel anytime).
Database refreshed July 2026Live NPPES registryⓘ sources
| # | Surgeon | Location | Medicare cases (2024) |
|---|---|---|---|
| 1 | James Maddux, MD | Missoula, MT | 147 |
| 2 | Michael Reed, MD | Missoula, MT | 147 |
| 3 | Arthur Rabinowitz, MD | Billings, MT | 137 |
| 4 | Shunsuke Aoi, M.D. | Billings, MT | 133 |
| 5 | Daniel Spoon, M.D. | Missoula, MT | 122 |
| 6 | Brian Rah, MD | Billings, MT | 113 |
| 7 | Ronald Henckel, MD | Billings, MT | 112 |
| 8 | Claudia Lama Von Buchwald, MD | Billings, MT | 105 |
| 9 | Per Sommer, M.D. | Billings, MT | 86 |
| 10 | Nathaniel Hall, M.D. | Kalispell, MT | 86 |
18 more Montana surgeons in the full list
Plus: who already pays them (Stryker? Medtronic? Arthrex?), CSV export for your CRM, and every other state and procedure.
Search the full databaseFrequently asked questions
- How many surgeons perform Diagnostic Cardiac Cath (Left Heart) in Montana?
- 28 Montana providers billed Medicare for Diagnostic Cardiac Cath (Left Heart) (CPT 93458) in CY2024. CMS suppresses providers with 10 or fewer Medicare patients, so the true count is somewhat higher.
- Where does this data come from?
- CMS Medicare Physician & Other Practitioners (fee-for-service Part B claims, CY2024, released May 2026) and CMS Open Payments. Both are official U.S. federal datasets.
- Does this include all of a surgeon's cases?
- No — it covers traditional Medicare only (no Medicare Advantage, commercial, or Medicaid claims). Absolute volumes undercount total practice, but the ranking of high- vs low-volume surgeons is a strong targeting signal.