Highest-Volume Partial Knee Replacement Surgeons in California (2026 update)
22 California providers billed Medicare for Partial Knee Replacement (CPT 27446) 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 | Philip Merritt, M.D. | Glendale, CA | 136 |
| 2 | John Andrawis, M.D. | Torrance, CA | 49 |
| 3 | Ryan Moore, MD | Saint Helena, CA | 44 |
| 4 | Kevin Ehrhart, M.D. | Santa Monica, CA | 37 |
| 5 | Alexander Sah, MD | Fremont, CA | 31 |
| 6 | Michael Abdulian, MD | Glendale, CA | 27 |
| 7 | Paul Gilbert, M.D. | Los Angeles, CA | 27 |
| 8 | Thomas Ferro, M.D. | Arroyo Grande, CA | 24 |
| 9 | Thomas Nguyen, M.D. | San Diego, CA | 20 |
| 10 | Todd Shrader, M.D. | Torrance, CA | 20 |
12 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 Partial Knee Replacement in California?
- 22 California providers billed Medicare for Partial Knee Replacement (CPT 27446) 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.