Dr. Mark Oyer, MD
Contact & Location
Rockford, IL 61114
Dr. Mark Oyer is a board-certified orthopedic surgeon practicing in Rockford, Illinois. A Medicare provider since 2015, Dr. Oyer has performed 130 Medicare-verified knee replacements (#10 in Illinois) and 80 hip replacements, for a combined total of 210 procedures.
In Illinois, Dr. Oyer performs well above average in knee (130 vs 50 avg), well above average in hip (80 vs 39 avg).
Dr. Oyer's reported Medicare volume is split between knee replacements (130 cases) and hip replacements (80 cases).
Rockford is home to 8 orthopedic surgeons in the current Medicare dataset. Patients in the Rockford area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Oyer extend back to 2020, covering 5 years of data. Over that period, recorded procedure volume increased from 24 to 210 in the most recent data, a 775% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,599 knee replacement surgeons tracked nationally, Dr. Oyer's 130 verified procedures is more than 2x the national average of 45.
Verified Case Volume Trends (2013-Current)
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. 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 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. Oyer's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 210 procedures shown here.
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 Elizabeth Medical Center, Fhn Memorial Hospital.
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.