Dr. Evan Zahner, M.D.
Contact & Location
781-279-7040
Stoneham, MA 02180
Malden, MA 02148
Northborough, MA 01532
Brockton, MA 02301
Dr. Zahner performs more hip replacement procedures than 43% of orthopedic surgeons in Massachusetts, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #68 of 121 ranked hip surgeons in Massachusetts.
About Dr. Zahner
Practice. Dr. Evan Zahner is a board-certified orthopedic surgeon practicing in Stoneham, Massachusetts. The latest annual CMS data records 29 hip replacements and 20 knee replacements, 49 procedures in all. That is #68 in Massachusetts for hip replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2014 to 2024, 10 years. Volume rose from 15 procedures a year to 49, up 227%.
National context. Among 4,542 hip replacement surgeons tracked nationally, 29 procedures is near the national average of 36.
Local context. Stoneham has 3 orthopedic surgeons in the current Medicare data. Comparing volume and procedure mix across them is one way to narrow a shortlist.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 0 | 0 |
| 2014 | 15 | 0 |
| 2015 | 0 | 0 |
| 2016 | 20 | 17 |
| 2017 | 32 | 22 |
| 2018 | 27 | 15 |
| 2019 | 37 | 25 |
| 2020 | 26 | 19 |
| 2021 | 33 | 21 |
| 2022 | 29 | 23 |
| 2023 | 39 | 33 |
| 2024 | 29 | 20 |
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 25% to 33% for hip replacement, 23% to 28% for knee 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. Zahner Compares
Procedure volume compared to the Massachusetts state average.
Volume Trend Analysis
Dr. Zahner's Medicare-recorded procedure volume has trended upward over 10 years, increasing 227% from 15 procedures in 2014 to 49 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 Hip Replacement
If you are considering hip replacement surgery, these evidence-based guides can help you prepare and recover:
Understanding the progression from conservative treatments to surgical intervention, and how to determine when hip replacement becomes the right choice.
Prehabilitation: Preparing Your Body for SurgeryEvidence-based exercises and lifestyle adjustments that can improve surgical outcomes and speed recovery when started weeks before your procedure.
Pain Management After Joint ReplacementA comprehensive guide to managing post-surgical pain through medication, physical therapy, cold therapy, and non-pharmacological strategies.
Medicare Bundled Payment Programs for Joint ReplacementHow bundled payment models affect your joint replacement costs and care coordination, and what it means for hospital and surgeon selection.
Hip Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after hip replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full hip replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Zahner
How does Dr. Zahner's procedure volume compare to other Massachusetts surgeons?
Dr. Zahner has performed 49 Medicare-verified joint replacement procedures. The Massachusetts average is 74 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Zahner ranks #101 out of 203 orthopedic surgeons in Massachusetts.
What types of joint replacement does Dr. Zahner perform?
Dr. Zahner's Medicare data shows procedures in hip replacement (29 cases) and knee replacement (20 cases).
Are there other orthopedic surgeons near Dr. Zahner in Stoneham?
Yes. There are 3 orthopedic surgeons in Stoneham in the current Medicare dataset. Patients can compare procedure volumes and specializations to choose the surgeon who best fits their needs. Use the state page to view all Massachusetts surgeons.
What does the Medicare data for Dr. Zahner 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 25% to 33% for hip replacement, 23% to 28% for knee replacement, which puts Dr. Zahner's total volume across all insurers at roughly 160 to 200 procedures against the 49 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. Zahner's procedure volume changed over time?
Yes. Dr. Zahner's Medicare-recorded volume has increased from 15 procedures in 2014 to 49 in the most recent data, a 227% increase over 10 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 72 procedures in 2023.
Does Dr. Zahner perform more than one type of joint replacement?
Yes. Dr. Zahner's Medicare data shows procedures in hip replacement (29 cases), knee replacement (20 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Zahner affiliated with?
According to CMS facility affiliation data, Dr. Zahner is affiliated with Melrosewakefield Healthcare, Winchester Hospital.
How does Dr. Zahner compare to other orthopedic surgeons in Stoneham?
Among the 3 orthopedic surgeons in Stoneham, Dr. Zahner ranks #1 by total Medicare procedure volume. Dr. Zahner has the highest verified Medicare volume in the city.
What are the quality ratings for hospitals where Dr. Zahner practices?
Melrosewakefield Healthcare (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Winchester Hospital (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.
Other Orthopedic Surgeons in Stoneham, Massachusetts
Dr. Zahner's 49 Medicare procedures are above the Stoneham average of 35. The table below compares verified procedure volumes for orthopedic surgeons practicing in Stoneham.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Abraham Shurland | 43 | Knee |
| Dr. Marie Walcott | 13 | Shoulder |
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.