Highest-Volume Colonoscopy with Biopsy Surgeons in California (2026 update)
1245 California providers billed Medicare for Colonoscopy with Biopsy (CPT 45380) 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 | Joel Sach, M.D. | Tarzana, CA | 499 |
| 2 | Tegpal Atwal | Saint Helena, CA | 492 |
| 3 | Kuntal Thaker, MD | Santa Cruz, CA | 477 |
| 4 | John Hong, MD | Fallbrook, CA | 474 |
| 5 | Geoffrey Spencer, MD | San Jose, CA | 451 |
| 6 | Steven Johnson, M.D | Salinas, CA | 434 |
| 7 | Atul Vachhani, MD | Santa Maria, CA | 353 |
| 8 | Cristina Wiese, MD | Thousand Oaks, CA | 345 |
| 9 | Kevin Kodama, M.D. | Fresno, CA | 338 |
| 10 | Rahim Raoufi, MD | Lompoc, CA | 337 |
1235 more California 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 Colonoscopy with Biopsy in California?
- 1245 California providers billed Medicare for Colonoscopy with Biopsy (CPT 45380) 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.