Dr. John Hamilton, M.D.
Contact & Location
641-844-2213
Marshalltown, IA 50158
Bemidji, MN 56601
Manitowoc, WI 54220
Dr. Hamilton performs more knee replacement procedures than 21% of orthopedic surgeons in Iowa, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #71 of 90 ranked knee surgeons in Iowa.
About Dr. Hamilton
Practice. Dr. John Hamilton is a board-certified orthopedic surgeon practicing in Marshalltown, Iowa. The latest annual CMS data records 19 knee replacements. That is #71 in Iowa for knee replacement. A Medicare provider since 2007.
Trend. Medicare records run from 2016 to 2024, 5 years. Volume rose from 11 procedures a year to 19, up 73%.
National context. Among 6,612 knee replacement surgeons tracked nationally, 19 procedures is below the national average of 45. Medicare covers part of all joint replacements, so true volume is likely higher.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 11 |
| 2017 | 12 | 17 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 16 |
| 2023 | 0 | 17 |
| 2024 | 0 | 19 |
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. Hamilton Compares
Procedure volume compared to the Iowa state average.
Volume Trend Analysis
Dr. Hamilton's Medicare-recorded procedure volume has trended upward over 5 years, increasing 73% from 11 procedures in 2016 to 19 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 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.
What to Expect on the Day of SurgeryA step-by-step walkthrough of your surgical day, from pre-op preparation through anesthesia, the procedure itself, and the first hours of recovery.
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 Coverage for Joint ReplacementWhat Medicare Part A and Part B cover for joint replacement surgery, including hospital stays, surgeon fees, anesthesia, and physical therapy.
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. Hamilton
How does Dr. Hamilton's procedure volume compare to other Iowa surgeons?
Dr. Hamilton has performed 19 Medicare-verified joint replacement procedures. The Iowa average is 73 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Hamilton ranks #95 out of 105 orthopedic surgeons in Iowa.
What types of joint replacement does Dr. Hamilton perform?
Dr. Hamilton's reported Medicare volume is focused on knee replacement, with 19 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Where is Dr. Hamilton's practice located?
Dr. Hamilton practices in Marshalltown, Iowa. The office is located at 421 E Merle Hibbs Blvd, Marshalltown, IA 50158. Patients in the surrounding area can consult Dr. Hamilton for joint replacement evaluation.
What does the Medicare data for Dr. Hamilton 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. Hamilton's total volume across all insurers at roughly 70 to 80 procedures against the 19 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. Hamilton's procedure volume changed over time?
Yes. Dr. Hamilton's Medicare-recorded volume has increased from 11 procedures in 2016 to 19 in the most recent data, a 73% increase over 5 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 29 procedures in 2017.
Which hospitals is Dr. Hamilton affiliated with?
According to CMS facility affiliation data, Dr. Hamilton is affiliated with Unitypoint Health - Marshalltown, Franklin General Hospital, Mary Greeley Medical Center.
What are the quality ratings for hospitals where Dr. Hamilton practices?
Unitypoint Health - Marshalltown (insufficient case volume for complication rate comparison); Mary Greeley Medical Center (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.
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.