Dr. William Thomas, M.D.
Contact & Location
312-695-6800
Chicago, IL 60611
Gainesville, FL 32607
Chicago, IL 60611
Dr. Thomas performs more hip replacement procedures than 30% of orthopedic surgeons in Illinois, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #128 of 184 ranked hip surgeons in Illinois.
About Dr. Thomas
Practice. Dr. William Thomas is a board-certified orthopedic surgeon practicing in Chicago, Illinois. The latest annual CMS data records 21 knee replacements and 21 hip replacements, 42 procedures in all. That is #190 in Illinois for knee replacement. A Medicare provider since 2016.
Trend. Dr. Thomas first appears in the Medicare data in 2023. With 2 years on record, the trend is still short.
National context. Among 4,542 hip replacement surgeons tracked nationally, 21 procedures is below the national average of 36. Medicare covers part of all joint replacements, so true volume is likely higher.
Local context. Chicago has 41 orthopedic surgeons in the current Medicare data. Comparing volume and procedure mix across them is one way to narrow a shortlist.
Verified Case Volume
Verified Medicare data is available for 2 years: 15 procedures in 2023 and 42 procedures in the most recent reporting year. A multi-year trend chart is shown once at least 3 years of data are available.
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 25% to 33% for hip 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. Thomas Compares
Procedure volume compared to the Illinois state average.
Volume Trend Analysis
Dr. Thomas has 2 years of Medicare procedure data beginning in 2023. Additional years of data will provide a clearer picture of volume trends.
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 Hip Replacement
If you are considering hip replacement surgery, these evidence-based guides can help you prepare and recover:
Understanding the progression from conservative treatments to surgical intervention, and how to determine when hip replacement becomes the right choice.
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.
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.
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.
Hip Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after hip replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full hip replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Thomas
How does Dr. Thomas's procedure volume compare to other Illinois surgeons?
Dr. Thomas has performed 42 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. Thomas ranks #170 out of 316 orthopedic surgeons in Illinois.
What types of joint replacement does Dr. Thomas perform?
Dr. Thomas's Medicare data shows procedures in knee replacement (21 cases) and hip replacement (21 cases).
Are there other orthopedic surgeons near Dr. Thomas in Chicago?
Yes. There are 41 orthopedic surgeons in Chicago 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. Thomas 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 25% to 33% for hip replacement, 23% to 28% for knee replacement, which puts Dr. Thomas's total volume across all insurers at roughly 140 to 180 procedures against the 42 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.
Does Dr. Thomas perform more than one type of joint replacement?
Yes. Dr. Thomas's Medicare data shows procedures in knee replacement (21 cases), hip replacement (21 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Thomas affiliated with?
According to CMS facility affiliation data, Dr. Thomas is affiliated with Northwestern Memorial Hospital, Palos Community Hospital, Northwestern Medicine Delnor Community Hospital, Northwestern Medicine Central Dupage Hospital.
How does Dr. Thomas compare to other orthopedic surgeons in Chicago?
Among the 41 orthopedic surgeons in Chicago, Dr. Thomas ranks #20 by total Medicare procedure volume. The highest-volume surgeon in Chicago has 318 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Thomas practices?
Northwestern Memorial Hospital (5 out of 5 CMS stars, hip/knee complication rate similar to national average); Palos Community Hospital (3 out of 5 CMS stars, hip/knee complication rate similar to national average); Northwestern Medicine Delnor Community Hospital (5 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 Chicago, Illinois
Dr. Thomas's 42 Medicare procedures are below the Chicago average of 207. The table below compares verified procedure volumes for orthopedic surgeons practicing in Chicago.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Denis Nam | 318 | Hip, Knee |
| Dr. Vasili Karas | 287 | Hip, Knee |
| Dr. Raju Ghate | 257 | Knee |
| Dr. Hany Bedair | 249 | Hip, Knee |
| Dr. Tad Gerlinger | 155 | Hip, Knee |
| Dr. Kevin Hardt | 141 | 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.