Dr. Diane Hillard-Sembell, M.D.
Dr. Diane Hillard-Sembell is a board-certified orthopedic surgeon practicing in Springfield, Illinois. Dr. Hillard-Sembell has performed 17 Medicare-verified knee replacements, ranking #219 in Illinois.
Dr. Hillard-Sembell has recorded 17 Medicare fee-for-service procedures. Medicare data represents approximately one-third of all joint replacements nationwide, so these counts reflect only a portion of a surgeon's full practice. Illinois has 323 orthopedic surgeons in the current dataset.
Dr. Hillard-Sembell's Medicare data shows a focused knee replacement practice with 17 verified procedures in 2023. Surgeons who concentrate on a single procedure type often develop deep procedural expertise, though total practice volume may include additional procedures not captured in Medicare fee-for-service data.
Springfield is home to 12 orthopedic surgeons in the current Medicare dataset. Patients in the Springfield area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Dr. Hillard-Sembell's Medicare data spans 11 years, beginning in 2013. Volume peaked at 39 procedures in 2014 before settling at 17 in 2023. Changes in Medicare reporting, payer mix shifts, or practice focus adjustments can all influence year-to-year volume.
Dr. Hillard-Sembell's Medicare volume of 17 procedures is below the national median of 44. Medicare data captures roughly a third of all joint replacements, so actual practice volume across all payers is likely higher.
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.
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Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Hillard-Sembell's recorded volume peaked at 39 procedures in 2014 and stood at 17 in 2023. Year-to-year variation can reflect changes in payer mix, practice scope, or Medicare billing patterns.
Frequently Asked Questions About Dr. Hillard-Sembell
How does Dr. Hillard-Sembell's procedure volume compare to other Illinois surgeons?
Dr. Hillard-Sembell has performed 17 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. Hillard-Sembell ranks #272 out of 323 orthopedic surgeons in Illinois.
What types of joint replacement does Dr. Hillard-Sembell perform?
Dr. Hillard-Sembell's reported Medicare volume is focused on knee replacement, with 17 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Hillard-Sembell in Springfield?
Yes. There are 12 orthopedic surgeons in Springfield 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. Hillard-Sembell 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. Hillard-Sembell's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 17 procedures shown here.
Has Dr. Hillard-Sembell's procedure volume changed over time?
Dr. Hillard-Sembell's Medicare-recorded volume peaked at 39 procedures in 2014 and was 17 in 2023. Volume fluctuations can reflect changes in payer mix, practice focus, or Medicare reporting rather than a change in overall surgical activity.
How does Dr. Hillard-Sembell compare to other orthopedic surgeons in Springfield?
Among the 12 orthopedic surgeons in Springfield, Dr. Hillard-Sembell ranks #10 by total Medicare procedure volume. The highest-volume surgeon in Springfield has 146 verified Medicare procedures.
Other Orthopedic Surgeons in Springfield, Illinois
Dr. Hillard-Sembell's 17 Medicare procedures are below the Springfield average of 97. The table below compares verified procedure volumes for orthopedic surgeons practicing in Springfield.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Piero Capecci | 146 | Hip, Knee |
| Dr. D Allan | 144 | Hip, Knee |
| Dr. Dane Church | 136 | Hip, Knee |
| Dr. Ryan Pate | 102 | Hip, Knee |
| Dr. Daniel Rossi | 89 | Hip, Knee |
| Dr. Brett Wolters | 43 | Knee |