Dr. Joseph Assenmacher, M.D.
Dr. Joseph Assenmacher is a board-certified orthopedic surgeon practicing in Oregon, Ohio. A Medicare provider since 2005, Dr. Assenmacher has completed 85 knee replacements (#28 in Ohio), 29 hip replacements, and 28 shoulder replacements, totaling 142 Medicare-verified procedures.
In Ohio, Dr. Assenmacher performs well above average in knee (85 vs 40 avg), near average in hip (29 vs 31 avg), near average in shoulder (28 vs 27 avg).
Dr. Assenmacher performs all three major joint replacement procedures — hip, knee, and shoulder — indicating a broad scope of orthopedic practice. The largest share is knee replacements (85 cases), followed by hip replacements (29) and shoulder replacements (28).
Oregon is home to 5 orthopedic surgeons in the current Medicare dataset. Patients in the Oregon area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Assenmacher extend back to 2013, covering 11 years of data. Over that period, recorded procedure volume increased from 80 to 142 in the most recent data, a 78% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,720 knee replacement surgeons tracked nationally, Dr. Assenmacher's 85 verified procedures is above the national average of 45.
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. Assenmacher Compares
Procedure volume compared to the Ohio state average.
Contact & Location
Oregon, OH 43616
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Assenmacher's Medicare-recorded procedure volume has trended upward over 11 years, increasing 78% from 80 procedures in 2013 to 142 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.
What to Expect on the Day of SurgeryA step-by-step walkthrough of your surgical day, from pre-op preparation through anesthesia, the procedure itself, and the first hours of recovery.
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 Coverage for Joint ReplacementWhat Medicare Part A and Part B cover for joint replacement surgery, including hospital stays, surgeon fees, anesthesia, and physical therapy.
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. Assenmacher
How does Dr. Assenmacher's procedure volume compare to other Ohio surgeons?
Dr. Assenmacher has performed 142 Medicare-verified joint replacement procedures. This is more than 2x the Ohio average of 57 procedures per surgeon. Dr. Assenmacher ranks #23 out of 378 orthopedic surgeons in Ohio.
What types of joint replacement does Dr. Assenmacher perform?
Dr. Assenmacher performs all three major joint replacement procedures: knee replacement (85 cases), hip replacement (29 cases), shoulder replacement (28 cases). This breadth indicates a comprehensive orthopedic joint replacement practice.
Are there other orthopedic surgeons near Dr. Assenmacher in Oregon?
Yes. There are 5 orthopedic surgeons in Oregon 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 Ohio surgeons.
What does the Medicare data for Dr. Assenmacher 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. Assenmacher's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 142 procedures shown here.
Has Dr. Assenmacher's procedure volume changed over time?
Yes. Dr. Assenmacher's Medicare-recorded volume has increased from 80 procedures in 2013 to 142 in the most recent data, a 78% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 142 procedures in 2023.
Does Dr. Assenmacher perform more than one type of joint replacement?
Yes. Dr. Assenmacher's Medicare data shows procedures in knee replacement (85 cases), hip replacement (29 cases), shoulder replacement (28 cases). Performing all three major joint replacements places Dr. Assenmacher among the 5% of orthopedic surgeons nationally who cover hip, knee, and shoulder arthroplasty.
Which hospitals is Dr. Assenmacher affiliated with?
According to CMS facility affiliation data, Dr. Assenmacher is affiliated with Bay Park Community Hospital, Toledo Hospital The, Magruder Hospital, Memorial Hospital.
How does Dr. Assenmacher compare to other orthopedic surgeons in Oregon?
Among the 5 orthopedic surgeons in Oregon, Dr. Assenmacher ranks #1 by total Medicare procedure volume. Dr. Assenmacher has the highest verified Medicare volume in the city.
What are the quality ratings for hospitals where Dr. Assenmacher practices?
Bay Park Community Hospital (3 out of 5 CMS stars, insufficient case volume for complication rate comparison); Toledo Hospital The (4 out of 5 CMS stars, hip/knee complication rate similar to national average); Magruder Hospital (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 Oregon, Ohio
Dr. Assenmacher's 142 Medicare procedures are above the Oregon average of 74. The table below compares verified procedure volumes for orthopedic surgeons practicing in Oregon.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Benjamin Assenmacher | 81 | Hip, Knee, Shoulder |
| Dr. Craig Assenmacher | 77 | Hip, Knee, Shoulder |
| Dr. Bradley Morse | 56 | Hip, Knee |
| Dr. Enesi Momoh | 14 | Shoulder |
Patient Reviews & Ratings
OrthoProcedures.com focuses on verified Medicare procedure data. For patient reviews, ratings, and appointment scheduling, visit these trusted platforms:
These links lead to third-party websites. OrthoProcedures.com is not affiliated with these platforms and cannot verify the accuracy of reviews.