Dr. Ian Duncan, MD
Contact & Location
559-733-3346
Visalia, CA 93277
Dr. Duncan performs more knee replacement procedures than 76% of orthopedic surgeons in California, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #116 of 491 ranked knee surgeons in California.
About Dr. Duncan
Dr. Ian Duncan is a board-certified orthopedic surgeon practicing in Visalia, California. A Medicare provider since 2008, Dr. Duncan completed 57 knee replacements (#116 in California), 29 hip replacements, and 16 shoulder replacements in the latest annual CMS data, totaling 102 Medicare-verified procedures.
In California, Dr. Duncan performs above the state average in knee (57 vs 47), below the state average in hip (29 vs 41), below the state average in shoulder (16 vs 31).
Dr. Duncan performs all three major joint replacement procedures (hip, knee, and shoulder), indicating a broad scope of orthopedic practice. The largest share is knee replacements (57 cases), followed by hip replacements (29) and shoulder replacements (16).
Beyond general orthopedic surgery, Dr. Duncan holds additional credentials in Sports Medicine, reflecting subspecialty training that may benefit patients with complex joint conditions.
Visalia is home to 9 orthopedic surgeons in the current Medicare dataset. Patients in the Visalia area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Duncan extend back to 2013, covering 12 years of data. Over that period, recorded procedure volume increased from 15 to 102 in the most recent data, a 580% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,612 knee replacement surgeons tracked nationally, Dr. Duncan's 57 verified procedures is above the national average of 45.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement | Shoulder Replacement |
|---|---|---|---|
| 2013 | 0 | 15 | 0 |
| 2014 | 17 | 28 | 11 |
| 2015 | 15 | 54 | 12 |
| 2016 | 16 | 58 | 0 |
| 2017 | 16 | 51 | 0 |
| 2018 | 25 | 55 | 0 |
| 2019 | 26 | 67 | 0 |
| 2020 | 20 | 44 | 0 |
| 2021 | 16 | 51 | 15 |
| 2022 | 25 | 65 | 11 |
| 2023 | 22 | 74 | 13 |
| 2024 | 29 | 57 | 16 |
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, 25% to 33% for hip replacement, 29% to 37% for shoulder 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. Duncan Compares
Procedure volume compared to the California state average.
Volume Trend Analysis
Dr. Duncan's Medicare-recorded procedure volume has trended upward over 12 years, increasing 580% from 15 procedures in 2013 to 102 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.
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.
Home Safety: Creating Your Recovery SanctuaryRoom-by-room modifications, equipment recommendations, and fall-prevention strategies to prepare your home for a safe post-surgical recovery.
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. Duncan
How does Dr. Duncan's procedure volume compare to other California surgeons?
Dr. Duncan has performed 102 Medicare-verified joint replacement procedures. This is significantly above the California average of 68 procedures per surgeon. Dr. Duncan ranks #110 out of 613 orthopedic surgeons in California.
What types of joint replacement does Dr. Duncan perform?
Dr. Duncan performs all three major joint replacement procedures: knee replacement (57 cases), hip replacement (29 cases), shoulder replacement (16 cases). This breadth indicates a comprehensive orthopedic joint replacement practice.
Are there other orthopedic surgeons near Dr. Duncan in Visalia?
Yes. There are 9 orthopedic surgeons in Visalia 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 California surgeons.
What does the Medicare data for Dr. Duncan 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, 25% to 33% for hip replacement, 29% to 37% for shoulder replacement, which puts Dr. Duncan's total volume across all insurers at roughly 330 to 420 procedures against the 102 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. Duncan's procedure volume changed over time?
Yes. Dr. Duncan's Medicare-recorded volume has increased from 15 procedures in 2013 to 102 in the most recent data, a 580% increase over 12 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 109 procedures in 2023.
Does Dr. Duncan perform more than one type of joint replacement?
Yes. Dr. Duncan's Medicare data shows procedures in knee replacement (57 cases), hip replacement (29 cases), shoulder replacement (16 cases). Performing all three major joint replacements places Dr. Duncan among the 5% of orthopedic surgeons nationally who cover hip, knee, and shoulder arthroplasty.
Which hospitals is Dr. Duncan affiliated with?
According to CMS facility affiliation data, Dr. Duncan is affiliated with Kaweah Health Medical Center, Sierra View Medical Center, Adventist Health Hanford.
How does Dr. Duncan compare to other orthopedic surgeons in Visalia?
Among the 9 orthopedic surgeons in Visalia, Dr. Duncan ranks #1 by total Medicare procedure volume. Dr. Duncan has the highest verified Medicare volume in the city.
What are the quality ratings for hospitals where Dr. Duncan practices?
Kaweah Health Medical Center (3 out of 5 CMS stars, hip/knee complication rate similar to national average); Sierra View Medical Center (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Adventist Health Hanford (2 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 Visalia, California
Dr. Duncan's 102 Medicare procedures are above the Visalia average of 66. The table below compares verified procedure volumes for orthopedic surgeons practicing in Visalia.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Burton Redd | 94 | Hip, Knee, Shoulder |
| Dr. Seth Criner | 85 | Hip, Knee, Shoulder |
| Dr. Bruce Le | 73 | Knee, Shoulder |
| Dr. Benjamin Hendy | 37 | Shoulder |
| Dr. Jun Kim | 36 | Hip, Knee |
| Dr. Timothy Tan | 32 | 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.