Dr. Michael Zahn, M.D.
Contact & Location
315-824-1250
Hamilton, NY 13346
Dr. Zahn performs more knee replacement procedures than 44% of orthopedic surgeons in New York, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #148 of 269 ranked knee surgeons in New York.
About Dr. Zahn
Practice. Dr. Michael Zahn is a board-certified orthopedic surgeon practicing in Hamilton, New York. The latest annual CMS data records 27 knee replacements and 19 hip replacements, 46 procedures in all. That is #148 in New York for knee replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2013 to 2024, 12 years. Volume peaked at 96 in 2019 and stands at 46 now. Reporting changes and payer mix can both move that number.
National context. Among 6,612 knee replacement surgeons tracked nationally, 27 procedures is below the national average of 45. Medicare covers part of all joint replacements, so true volume is likely higher.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement | Shoulder Replacement |
|---|---|---|---|
| 2013 | 0 | 32 | 0 |
| 2014 | 12 | 35 | 0 |
| 2015 | 19 | 39 | 0 |
| 2016 | 18 | 39 | 0 |
| 2017 | 22 | 47 | 0 |
| 2018 | 17 | 44 | 11 |
| 2019 | 26 | 57 | 13 |
| 2020 | 22 | 46 | 13 |
| 2021 | 21 | 39 | 0 |
| 2022 | 25 | 40 | 13 |
| 2023 | 29 | 42 | 15 |
| 2024 | 19 | 27 | 0 |
Verified Medicare Cases
How is this estimated?
Medicare Part B fee-for-service claims are one payer stream among several, and the share they represent differs by procedure. In 2024 it was 23% to 28% for knee replacement, 25% to 33% for hip replacement. Each verified count above is divided by its own procedure's range, and the results are added, to estimate total practice volume across all payers. The verified Medicare count is the definitive, audited figure; this is a range derived from published national volume projections, not a measurement, and an individual practice can sit well outside it: how these ranges are derived, and their sources.
How Dr. Zahn Compares
Procedure volume compared to the New York state average.
Volume Trend Analysis
Dr. Zahn's recorded volume peaked at 96 procedures in 2019 and stood at 46 in the most recent data. Year-to-year variation can reflect changes in payer mix, practice scope, or Medicare billing patterns.
Hospital Affiliations & Quality
Quality ratings and complication rates are hospital-level metrics from CMS Hospital Compare and do not reflect individual surgeon performance. Star ratings updated quarterly. Complication data covers a rolling 3-year period.
Patient Resources: Preparing for Knee Replacement
If you are considering knee replacement surgery, these evidence-based guides can help you prepare and recover:
An overview of current surgical approaches including robotic-assisted and minimally invasive techniques, implant options, and expected outcomes.
What to Expect on the Day of SurgeryA step-by-step walkthrough of your surgical day, from pre-op preparation through anesthesia, the procedure itself, and the first hours of recovery.
Home Safety: Creating Your Recovery SanctuaryRoom-by-room modifications, equipment recommendations, and fall-prevention strategies to prepare your home for a safe post-surgical recovery.
Medicare Coverage for Joint ReplacementWhat Medicare Part A and Part B cover for joint replacement surgery, including hospital stays, surgeon fees, anesthesia, and physical therapy.
Knee Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after knee replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full knee replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Zahn
How does Dr. Zahn's procedure volume compare to other New York surgeons?
Dr. Zahn has performed 46 Medicare-verified joint replacement procedures. The New York average is 69 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Zahn ranks #164 out of 334 orthopedic surgeons in New York.
What types of joint replacement does Dr. Zahn perform?
Dr. Zahn's Medicare data shows procedures in knee replacement (27 cases) and hip replacement (19 cases).
Where is Dr. Zahn's practice located?
Dr. Zahn practices in Hamilton, New York. The office is located at 85 College St, Hamilton, NY 13346. Patients in the surrounding area can consult Dr. Zahn for joint replacement evaluation.
What does the Medicare data for Dr. Zahn represent?
The procedure counts shown are based on 2024 Medicare Part B fee-for-service claims data, published by the Centers for Medicare and Medicaid Services (CMS). Medicare fee-for-service is only one payer stream, and the share of national volume it represents differs by procedure. In 2024 the share was 23% to 28% for knee replacement, 25% to 33% for hip replacement, which puts Dr. Zahn's total volume across all insurers at roughly 150 to 190 procedures against the 46 verified here. Those shares are derived from published national volume projections rather than quoted from a single publication, and they are estimates with real uncertainty. The OrthoProcedures methodology page shows the full derivation, the sources, and the limits at orthoprocedures.com/data-methodology.html.
Has Dr. Zahn's procedure volume changed over time?
Dr. Zahn's Medicare-recorded volume peaked at 96 procedures in 2019 and was 46 in the most recent data. Volume fluctuations can reflect changes in payer mix, practice focus, or Medicare reporting rather than a change in overall surgical activity.
Does Dr. Zahn perform more than one type of joint replacement?
Yes. Dr. Zahn's Medicare data shows procedures in knee replacement (27 cases), hip replacement (19 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Zahn affiliated with?
According to CMS facility affiliation data, Dr. Zahn is affiliated with Oneida Health, Chenango Memorial Hospital, Community Memorial Hospital, Inc.
What are the quality ratings for hospitals where Dr. Zahn practices?
Oneida Health (3 out of 5 CMS stars, insufficient case volume for complication rate comparison); Chenango Memorial Hospital (insufficient case volume for complication rate comparison); Community Memorial Hospital, Inc (3 out of 5 CMS stars, hip/knee complication rate similar to national average). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Patient Resources & Verification
Research reviews, verify credentials, and check official quality data through these trusted sources:
Medicare Care Compare and NPI Registry are official U.S. government sources. Google reviews reflect user-submitted feedback. OrthoProcedures.com does not verify the accuracy of third-party review content.