Dr. Mark Oyer, M.D.
Contact & Location
815-398-9491
Rockford, IL 61114
Dr. Oyer performs more knee replacement procedures than 96% of orthopedic surgeons in Illinois, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #10 of 251 ranked knee surgeons in Illinois.
About Dr. Oyer
Practice. Dr. Mark Oyer is a board-certified orthopedic surgeon practicing in Rockford, Illinois. The latest annual CMS data records 130 knee replacements and 80 hip replacements, 210 procedures in all. That is #10 in Illinois for knee replacement. A Medicare provider since 2015.
Trend. Medicare records run from 2020 to 2024, 5 years. Volume rose from 24 procedures a year to 210, up 775%.
National context. Among 6,612 knee replacement surgeons tracked nationally, 130 procedures is more than 2x the national average of 45.
Local context. Rockford has 8 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 | 24 |
| 2021 | 35 | 47 |
| 2022 | 44 | 58 |
| 2023 | 82 | 131 |
| 2024 | 80 | 130 |
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. Oyer Compares
Procedure volume compared to the Illinois state average.
Volume Trend Analysis
Dr. Oyer's Medicare-recorded procedure volume has trended upward over 5 years, increasing 775% from 24 procedures in 2020 to 210 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.
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.
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. Oyer
How does Dr. Oyer's procedure volume compare to other Illinois surgeons?
Dr. Oyer has performed 210 Medicare-verified joint replacement procedures. This is more than 3x the Illinois average of 69 procedures per surgeon. Dr. Oyer ranks #12 out of 316 orthopedic surgeons in Illinois.
What types of joint replacement does Dr. Oyer perform?
Dr. Oyer's Medicare data shows procedures in knee replacement (130 cases) and hip replacement (80 cases).
How experienced is Dr. Oyer with knee replacement surgery?
Dr. Oyer ranks #10 in Illinois for knee replacement with 130 Medicare-verified procedures. This high ranking among 316 state surgeons indicates significant experience with this specific procedure.
Are there other orthopedic surgeons near Dr. Oyer in Rockford?
Yes. There are 8 orthopedic surgeons in Rockford 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 Illinois surgeons.
What does the Medicare data for Dr. Oyer 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. Oyer's total volume across all insurers at roughly 710 to 890 procedures against the 210 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. Oyer's procedure volume changed over time?
Yes. Dr. Oyer's Medicare-recorded volume has increased from 24 procedures in 2020 to 210 in the most recent data, a 775% increase over 5 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 213 procedures in 2023.
Does Dr. Oyer perform more than one type of joint replacement?
Yes. Dr. Oyer's Medicare data shows procedures in knee replacement (130 cases), hip replacement (80 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Oyer affiliated with?
According to CMS facility affiliation data, Dr. Oyer is affiliated with Saint Anthony Medical Center, Cgh Medical Center, Uw Health, Osf Saint Katharine Medical Center, Osf Saint Paul Medical Center.
How does Dr. Oyer compare to other orthopedic surgeons in Rockford?
Among the 8 orthopedic surgeons in Rockford, Dr. Oyer ranks #1 by total Medicare procedure volume. Dr. Oyer has the highest verified Medicare volume in the city.
What are the quality ratings for hospitals where Dr. Oyer practices?
Saint Anthony Medical Center (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Cgh Medical Center (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Uw Health (3 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 Rockford, Illinois
Dr. Oyer's 210 Medicare procedures are above the Rockford average of 99. The table below compares verified procedure volumes for orthopedic surgeons practicing in Rockford.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. John Bottros | 173 | Hip, Knee |
| Dr. Jeremiah Pflederer | 100 | Hip, Knee |
| Dr. Mark Barba | 88 | Hip, Knee |
| Dr. Scott Trenhaile | 53 | Shoulder |
| Dr. Mathew Legel | 38 | Hip, Knee |
| Dr. Andrew Blint | 32 | Hip, Knee |
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.