Dr. Andrew Ertl, MD
Contact & Location
608-643-2471
Prairie Du Sac, WI 53578
Grand Rapids, MI 49525
Dr. Ertl performs more knee replacement procedures than 94% of orthopedic surgeons in Wisconsin, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #8 of 152 ranked knee surgeons in Wisconsin.
About Dr. Ertl
Dr. Andrew Ertl is a board-certified orthopedic surgeon practicing in Prairie Du Sac, Wisconsin. A Medicare provider since 2010, Dr. Ertl performed 79 Medicare-verified knee replacements in the latest annual CMS data, ranking #8 in Wisconsin.
In Wisconsin, Dr. Ertl performs well above the state average in knee (79 vs 36).
Dr. Ertl's Medicare data shows a focused knee replacement practice with 79 verified procedures. Surgeons who concentrate on a single procedure type often develop deep procedural expertise, though total practice volume may include additional procedures not captured in Medicare fee-for-service data.
Prairie Du Sac is home to 5 orthopedic surgeons in the current Medicare dataset. Patients in the Prairie Du Sac area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Ertl extend back to 2018, covering 7 years of data. Over that period, recorded procedure volume increased from 21 to 79 in the most recent data, a 276% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,599 knee replacement surgeons tracked nationally, Dr. Ertl's 79 verified procedures is above the national average of 45.
Verified Case Volume Trends (2013-Current)
| Year | Knee Replacement |
|---|---|
| 2013 | 0 |
| 2014 | 0 |
| 2015 | 0 |
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 21 |
| 2019 | 17 |
| 2020 | 19 |
| 2021 | 26 |
| 2022 | 25 |
| 2023 | 60 |
| 2024 | 79 |
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. 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. Ertl Compares
Procedure volume compared to the Wisconsin state average.
Volume Trend Analysis
Dr. Ertl's Medicare-recorded procedure volume has trended upward over 7 years, increasing 276% from 21 procedures in 2018 to 79 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.
Questions to Ask Your Surgeon Before Joint ReplacementA practical checklist of questions covering experience, technique, hospital choice, and recovery expectations to discuss during your surgical consultation.
Recovery Timeline: Week-by-Week ExpectationsA detailed week-by-week guide covering pain levels, mobility milestones, physical therapy progression, and when to expect a return to daily activities.
Outpatient Joint Replacement: A Medicare GuideHow outpatient joint replacement works under Medicare, including eligibility criteria, cost differences, and what to expect with same-day discharge.
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. Ertl
How does Dr. Ertl's procedure volume compare to other Wisconsin surgeons?
Dr. Ertl has performed 79 Medicare-verified joint replacement procedures. This is significantly above the Wisconsin average of 51 procedures per surgeon. Dr. Ertl ranks #33 out of 189 orthopedic surgeons in Wisconsin.
What types of joint replacement does Dr. Ertl perform?
Dr. Ertl's reported Medicare volume is focused on knee replacement, with 79 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
How experienced is Dr. Ertl with knee replacement surgery?
Dr. Ertl ranks #8 in Wisconsin for knee replacement with 79 Medicare-verified procedures. This high ranking among 189 state surgeons indicates significant experience with this specific procedure.
Are there other orthopedic surgeons near Dr. Ertl in Prairie Du Sac?
Yes. There are 5 orthopedic surgeons in Prairie Du Sac 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. Ertl 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, which puts Dr. Ertl's total volume across all insurers at roughly 280 to 340 procedures against the 79 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. Ertl's procedure volume changed over time?
Yes. Dr. Ertl's Medicare-recorded volume has increased from 21 procedures in 2018 to 79 in the most recent data, a 276% increase over 7 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 79 procedures in 2024.
Which hospitals is Dr. Ertl affiliated with?
According to CMS facility affiliation data, Dr. Ertl is affiliated with Sauk Prairie Hospital, Aspirus Divine Savior Hospital, Richland Hospital, Reedsburg Area Medical Center, University Of Wi Hospitals & Clinics Authority.
How does Dr. Ertl compare to other orthopedic surgeons in Prairie Du Sac?
Among the 5 orthopedic surgeons in Prairie Du Sac, Dr. Ertl ranks #4 by total Medicare procedure volume. The highest-volume surgeon in Prairie Du Sac has 153 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Ertl practices?
Sauk Prairie Hospital (5 out of 5 CMS stars, hip/knee complication rate similar to national average); Aspirus Divine Savior Hospital (3 out of 5 CMS stars, insufficient case volume for complication rate comparison); Richland Hospital (4 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 Prairie Du Sac, Wisconsin
Dr. Ertl's 79 Medicare procedures are below the Prairie Du Sac average of 109. The table below compares verified procedure volumes for orthopedic surgeons practicing in Prairie Du Sac.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Michael Lamson | 153 | Hip, Knee |
| Dr. Matthew Hebert | 136 | Hip, Knee, Shoulder |
| Dr. David Marcu | 111 | Hip, Knee, Shoulder |
| Dr. Benjamin Cooper | 64 | Hip, Knee, 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.