Dr. Alan Gegenheimer, D.O.
Contact & Location
262-656-3590
Pleasant Prairie, WI 53158
Dr. Gegenheimer performs more knee replacement procedures than 27% of orthopedic surgeons in Wisconsin, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #110 of 152 ranked knee surgeons in Wisconsin.
About Dr. Gegenheimer
Practice. Dr. Alan Gegenheimer is a board-certified orthopedic surgeon practicing in Pleasant Prairie, Wisconsin. The latest annual CMS data records 19 knee replacements and 13 hip replacements, 32 procedures in all. That is #110 in Wisconsin for knee replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2021 to 2024, 4 years. Volume rose from 11 procedures a year to 32, up 191%.
National context. Among 6,612 knee replacement surgeons tracked nationally, 19 procedures is below the national average of 45. Medicare covers part of all joint replacements, so true volume is likely higher.
Local context. Pleasant Prairie 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 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 11 | 0 |
| 2022 | 16 | 16 |
| 2023 | 13 | 0 |
| 2024 | 13 | 19 |
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. Gegenheimer Compares
Procedure volume compared to the Wisconsin state average.
Volume Trend Analysis
Dr. Gegenheimer's Medicare-recorded procedure volume has trended upward over 4 years, increasing 191% from 11 procedures in 2021 to 32 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.
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.
Rehabilitation Roadmap: Your Complete Recovery GuideA structured physical therapy progression from the first post-op exercises through full strength and mobility restoration over 3 to 6 months.
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.
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. Gegenheimer
How does Dr. Gegenheimer's procedure volume compare to other Wisconsin surgeons?
Dr. Gegenheimer has performed 32 Medicare-verified joint replacement procedures. The Wisconsin average is 51 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Gegenheimer ranks #113 out of 189 orthopedic surgeons in Wisconsin.
What types of joint replacement does Dr. Gegenheimer perform?
Dr. Gegenheimer's Medicare data shows procedures in knee replacement (19 cases) and hip replacement (13 cases).
Are there other orthopedic surgeons near Dr. Gegenheimer in Pleasant Prairie?
Yes. There are 3 orthopedic surgeons in Pleasant Prairie 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 Wisconsin surgeons.
What does the Medicare data for Dr. Gegenheimer 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. Gegenheimer's total volume across all insurers at roughly 110 to 130 procedures against the 32 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. Gegenheimer's procedure volume changed over time?
Yes. Dr. Gegenheimer's Medicare-recorded volume has increased from 11 procedures in 2021 to 32 in the most recent data, a 191% increase over 4 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 32 procedures in 2022.
Does Dr. Gegenheimer perform more than one type of joint replacement?
Yes. Dr. Gegenheimer's Medicare data shows procedures in knee replacement (19 cases), hip replacement (13 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Gegenheimer affiliated with?
According to CMS facility affiliation data, Dr. Gegenheimer is affiliated with Froedtert Pleasant Prairie Hospital.
How does Dr. Gegenheimer compare to other orthopedic surgeons in Pleasant Prairie?
Among the 3 orthopedic surgeons in Pleasant Prairie, Dr. Gegenheimer ranks #2 by total Medicare procedure volume. Dr. Gegenheimer is among the highest-volume surgeons in Pleasant Prairie.
What are the quality ratings for hospitals where Dr. Gegenheimer practices?
Froedtert Pleasant Prairie Hospital (1 out of 5 CMS stars, insufficient case volume for complication rate comparison). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Other Orthopedic Surgeons in Pleasant Prairie, Wisconsin
Dr. Gegenheimer's 32 Medicare procedures are above the Pleasant Prairie average of 28. The table below compares verified procedure volumes for orthopedic surgeons practicing in Pleasant Prairie.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Scott Simmons | 33 | Knee |
| Dr. Mhd Alsawaf | 18 | 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.