Dr. Donald Weimer, M.D.
Contact & Location
618-641-5800
O Fallon, IL 62269
Dr. Weimer performs more shoulder replacement procedures than 62% of orthopedic surgeons in Illinois, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #30 of 80 ranked shoulder surgeons in Illinois.
About Dr. Weimer
Practice. Dr. Donald Weimer is a board-certified orthopedic surgeon practicing in O Fallon, Illinois. The latest annual CMS data records 26 shoulder replacements and 19 knee replacements, 45 procedures in all. That is #30 in Illinois for shoulder replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2013 to 2024, 12 years. Volume rose from 37 procedures a year to 45, up 22%.
National context. Among 2,217 shoulder replacement surgeons tracked nationally, 26 procedures is near the national average of 29.
Local context. O Fallon has 2 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 | Knee Replacement | Shoulder Replacement |
|---|---|---|
| 2013 | 15 | 22 |
| 2014 | 14 | 11 |
| 2015 | 19 | 19 |
| 2016 | 12 | 19 |
| 2017 | 0 | 18 |
| 2018 | 18 | 18 |
| 2019 | 13 | 21 |
| 2020 | 13 | 25 |
| 2021 | 20 | 25 |
| 2022 | 12 | 0 |
| 2023 | 14 | 21 |
| 2024 | 19 | 26 |
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 29% to 37% for shoulder replacement, 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. Weimer Compares
Procedure volume compared to the Illinois state average.
Volume Trend Analysis
Dr. Weimer's Medicare-recorded procedure volume has trended upward over 12 years, increasing 22% from 37 procedures in 2013 to 45 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 Shoulder Replacement
If you are considering shoulder replacement surgery, these evidence-based guides can help you prepare and recover:
Evidence-based exercises and lifestyle adjustments that can improve surgical outcomes and speed recovery when started weeks before your procedure.
Nutrition and Recovery After Joint ReplacementHow protein intake, anti-inflammatory foods, hydration, and targeted supplements support bone healing and tissue repair after surgery.
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.
Shoulder Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after shoulder replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full shoulder replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Weimer
How does Dr. Weimer's procedure volume compare to other Illinois surgeons?
Dr. Weimer has performed 45 Medicare-verified joint replacement procedures. The Illinois average is 69 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Weimer ranks #166 out of 316 orthopedic surgeons in Illinois.
What types of joint replacement does Dr. Weimer perform?
Dr. Weimer's Medicare data shows procedures in shoulder replacement (26 cases) and knee replacement (19 cases).
Are there other orthopedic surgeons near Dr. Weimer in O Fallon?
Yes. There are 2 orthopedic surgeons in O Fallon 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. Weimer 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 29% to 37% for shoulder replacement, 23% to 28% for knee replacement, which puts Dr. Weimer's total volume across all insurers at roughly 140 to 170 procedures against the 45 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. Weimer's procedure volume changed over time?
Yes. Dr. Weimer's Medicare-recorded volume has increased from 37 procedures in 2013 to 45 in the most recent data, a 22% increase over 12 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 45 procedures in 2021.
Does Dr. Weimer perform more than one type of joint replacement?
Yes. Dr. Weimer's Medicare data shows procedures in shoulder replacement (26 cases), knee replacement (19 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Weimer affiliated with?
According to CMS facility affiliation data, Dr. Weimer is affiliated with Hshs St Elizabeth'S Hospital, St Josephs Hospital, Memorial Hospital, Sparta Community Hospital.
What are the quality ratings for hospitals where Dr. Weimer practices?
Hshs St Elizabeth'S Hospital (4 out of 5 CMS stars, hip/knee complication rate similar to national average); St Josephs Hospital (4 out of 5 CMS stars, insufficient case volume for complication rate comparison); Memorial Hospital (4 out of 5 CMS stars, hip/knee complication rate similar to national average). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Other Orthopedic Surgeons in O Fallon, Illinois
Dr. Weimer's 45 Medicare procedures are below the O Fallon average of 57. The table below compares verified procedure volumes for orthopedic surgeons practicing in O Fallon.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Kevin McCarthy | 69 | 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.