Dr. Gregory Barnhill, D.O.
Contact & Location
816-559-6500
North Kansas City, MO 64116
Dr. Barnhill performs more knee replacement procedures than 66% of orthopedic surgeons in Missouri, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #56 of 166 ranked knee surgeons in Missouri.
About Dr. Barnhill
Practice. Dr. Gregory Barnhill is a board-certified orthopedic surgeon practicing in North Kansas City, Missouri. The latest annual CMS data records 40 knee replacements. That is #56 in Missouri for knee replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2013 to 2024, 12 years. Volume peaked at 79 in 2018 and stands at 40 now. Reporting changes and payer mix can both move that number.
National context. Among 6,612 knee replacement surgeons tracked nationally, 40 procedures is near the national average of 45.
Local context. North Kansas City has 7 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 | Hip Replacement | Knee Replacement | Shoulder Replacement |
|---|---|---|---|
| 2013 | 20 | 56 | 0 |
| 2014 | 18 | 43 | 0 |
| 2015 | 16 | 35 | 0 |
| 2016 | 20 | 50 | 0 |
| 2017 | 0 | 50 | 0 |
| 2018 | 11 | 53 | 15 |
| 2019 | 14 | 46 | 13 |
| 2020 | 0 | 33 | 0 |
| 2021 | 11 | 30 | 0 |
| 2022 | 13 | 35 | 11 |
| 2023 | 11 | 36 | 0 |
| 2024 | 0 | 40 | 0 |
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 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. Barnhill Compares
Procedure volume compared to the Missouri state average.
Volume Trend Analysis
Dr. Barnhill's recorded volume peaked at 79 procedures in 2018 and stood at 40 in the most recent data. Year-to-year variation can reflect changes in payer mix, practice scope, or Medicare billing patterns.
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.
Prehabilitation: Preparing Your Body for SurgeryEvidence-based exercises and lifestyle adjustments that can improve surgical outcomes and speed recovery when started weeks before your procedure.
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 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.
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. Barnhill
How does Dr. Barnhill's procedure volume compare to other Missouri surgeons?
Dr. Barnhill has performed 40 Medicare-verified joint replacement procedures. The Missouri average is 59 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Barnhill ranks #111 out of 204 orthopedic surgeons in Missouri.
What types of joint replacement does Dr. Barnhill perform?
Dr. Barnhill's reported Medicare volume is focused on knee replacement, with 40 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Barnhill in North Kansas City?
Yes. There are 7 orthopedic surgeons in North Kansas City 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 Missouri surgeons.
What does the Medicare data for Dr. Barnhill 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 23% to 28% for knee replacement, which puts Dr. Barnhill's total volume across all insurers at roughly 140 to 170 procedures against the 40 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. Barnhill's procedure volume changed over time?
Dr. Barnhill's Medicare-recorded volume peaked at 79 procedures in 2018 and was 40 in the most recent data. Volume fluctuations can reflect changes in payer mix, practice focus, or Medicare reporting rather than a change in overall surgical activity.
Which hospitals is Dr. Barnhill affiliated with?
According to CMS facility affiliation data, Dr. Barnhill is affiliated with Cameron Regional Medical Center, Nkc Health, Harrison County Community Hospital.
How does Dr. Barnhill compare to other orthopedic surgeons in North Kansas City?
Among the 7 orthopedic surgeons in North Kansas City, Dr. Barnhill ranks #5 by total Medicare procedure volume. The highest-volume surgeon in North Kansas City has 144 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Barnhill practices?
Cameron Regional Medical Center (3 out of 5 CMS stars, hip/knee complication rate similar to national average); Nkc Health (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 North Kansas City, Missouri
Dr. Barnhill's 40 Medicare procedures are below the North Kansas City average of 64. The table below compares verified procedure volumes for orthopedic surgeons practicing in North Kansas City.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. David Paul | 144 | Hip, Knee |
| Dr. Robert Paul | 104 | Hip, Knee |
| Dr. Erich Lingenfelter | 72 | Shoulder |
| Dr. Alan Cornett | 46 | Hip, Knee |
| Dr. Dustin Woyski | 23 | Hip |
| Dr. James Reardon | 16 | 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.