Dr. Donald Weimer, M.D.
Contact & Location
O Fallon, IL 62269
Dr. Donald Weimer is a board-certified orthopedic surgeon practicing in O Fallon, Illinois. A Medicare provider since 2006, Dr. Weimer has performed 26 Medicare-verified shoulder replacements (#30 in Illinois) and 19 knee replacements, for a combined total of 45 procedures.
In Illinois, Dr. Weimer performs near average in shoulder (26 vs 27 avg), below average in knee (19 vs 50 avg).
Dr. Weimer's reported Medicare volume is split between shoulder replacements (26 cases) and knee replacements (19 cases).
O Fallon is home to 2 orthopedic surgeons in the current Medicare dataset. Patients in the O Fallon area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Weimer extend back to 2013, covering 12 years of data. Over that period, recorded procedure volume increased from 37 to 45 in the most recent data, a 22% increase. This sustained growth reflects an expanding joint replacement practice.
Among 2,213 shoulder replacement surgeons tracked nationally, Dr. Weimer's 26 verified procedures is near the national average of 29.
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. 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 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. Weimer's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 45 procedures shown here.
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.
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). 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.