Dr. Michael Zahn, MD
Dr. Michael Zahn is a board-certified orthopedic surgeon practicing in Hamilton, New York. A Medicare provider since 2006, Dr. Zahn has completed 42 knee replacements (#96 in New York), 29 hip replacements, and 15 shoulder replacements, totaling 86 Medicare-verified procedures.
In New York, Dr. Zahn performs near average in knee (42 vs 45 avg), below average in hip (29 vs 42 avg), below average in shoulder (15 vs 28 avg).
Dr. Zahn performs all three major joint replacement procedures — hip, knee, and shoulder — indicating a broad scope of orthopedic practice. The largest share is knee replacements (42 cases), followed by hip replacements (29) and shoulder replacements (15).
Dr. Zahn is the only orthopedic surgeon in Hamilton represented in the current Medicare dataset, serving as the primary local option for patients considering joint replacement surgery in the area.
Medicare records for Dr. Zahn extend back to 2013, covering 11 years of data. Over that period, recorded procedure volume increased from 32 to 86 in the most recent data, a 169% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,720 knee replacement surgeons tracked nationally, Dr. Zahn's 42 verified procedures is near the national average of 45.
Verified Medicare Cases
How is this estimated?
Medicare Part B fee-for-service claims represent approximately 33–37% of all joint replacements performed nationally (source: CMS data, AJRR). This range estimates the surgeon's total practice volume across all payers. The verified Medicare count above is the definitive, audited figure.
How Dr. Zahn Compares
Procedure volume compared to the New York state average.
Contact & Location
Hamilton, NY 13346
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Zahn's Medicare-recorded procedure volume has trended upward over 11 years, increasing 169% from 32 procedures in 2013 to 86 in the most recent data.
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 86 Medicare-verified joint replacement procedures. This is in line with the New York average of 67 procedures per surgeon. Dr. Zahn ranks #90 out of 338 orthopedic surgeons in New York.
What types of joint replacement does Dr. Zahn perform?
Dr. Zahn performs all three major joint replacement procedures: knee replacement (42 cases), hip replacement (29 cases), shoulder replacement (15 cases). This breadth indicates a comprehensive orthopedic joint replacement practice.
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 the most recent Medicare Part B fee-for-service claims data, published by the Centers for Medicare and Medicaid Services (CMS). This captures approximately 33–37% of all joint replacements performed nationally. Dr. Zahn's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 86 procedures shown here.
Has Dr. Zahn's procedure volume changed over time?
Yes. Dr. Zahn's Medicare-recorded volume has increased from 32 procedures in 2013 to 86 in the most recent data, a 169% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 96 procedures in 2019.
Does Dr. Zahn perform more than one type of joint replacement?
Yes. Dr. Zahn's Medicare data shows procedures in knee replacement (42 cases), hip replacement (29 cases), shoulder replacement (15 cases). Performing all three major joint replacements places Dr. Zahn among the 5% of orthopedic surgeons nationally who cover hip, knee, and shoulder arthroplasty.
Which hospitals is Dr. Zahn affiliated with?
According to CMS facility affiliation data, Dr. Zahn is affiliated with Oneida Health, 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); 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 Reviews & Ratings
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