Dr. Gregory Duff, M.D.
Contact & Location
360-698-6630
Silverdale, WA 98383
Dr. Duff performs more shoulder replacement procedures than 57% of orthopedic surgeons in Washington, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #24 of 56 ranked shoulder surgeons in Washington.
About Dr. Duff
Practice. Dr. Gregory Duff is a board-certified orthopedic surgeon practicing in Silverdale, Washington. The latest annual CMS data records 25 shoulder replacements. That is #24 in Washington for shoulder replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2020 to 2024, 5 years. Volume rose from 12 procedures a year to 25, up 108%.
National context. Among 2,217 shoulder replacement surgeons tracked nationally, 25 procedures is near the national average of 29.
Local context. Silverdale has 6 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 | Shoulder Replacement |
|---|---|
| 2013 | 0 |
| 2014 | 0 |
| 2015 | 0 |
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 12 |
| 2021 | 16 |
| 2022 | 13 |
| 2023 | 17 |
| 2024 | 25 |
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 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. Duff Compares
Procedure volume compared to the Washington state average.
Volume Trend Analysis
Dr. Duff's Medicare-recorded procedure volume has trended upward over 5 years, increasing 108% from 12 procedures in 2020 to 25 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 Shoulder Replacement
If you are considering shoulder replacement surgery, these evidence-based guides can help you prepare and recover:
A practical checklist of questions covering experience, technique, hospital choice, and recovery expectations to discuss during your surgical consultation.
Nutrition and Recovery After Joint ReplacementHow protein intake, anti-inflammatory foods, hydration, and targeted supplements support bone healing and tissue repair after surgery.
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.
Shoulder Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after shoulder replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full shoulder replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Duff
How does Dr. Duff's procedure volume compare to other Washington surgeons?
Dr. Duff has performed 25 Medicare-verified joint replacement procedures. The Washington average is 59 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Duff ranks #148 out of 198 orthopedic surgeons in Washington.
What types of joint replacement does Dr. Duff perform?
Dr. Duff's reported Medicare volume is focused on shoulder replacement, with 25 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Duff in Silverdale?
Yes. There are 6 orthopedic surgeons in Silverdale 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 Washington surgeons.
What does the Medicare data for Dr. Duff 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 29% to 37% for shoulder replacement, which puts Dr. Duff's total volume across all insurers at roughly 70 to 90 procedures against the 25 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. Duff's procedure volume changed over time?
Yes. Dr. Duff's Medicare-recorded volume has increased from 12 procedures in 2020 to 25 in the most recent data, a 108% increase over 5 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 25 procedures in 2024.
Which hospitals is Dr. Duff affiliated with?
According to CMS facility affiliation data, Dr. Duff is affiliated with St Michael Medical Center, Olympic Medical Center.
How does Dr. Duff compare to other orthopedic surgeons in Silverdale?
Among the 6 orthopedic surgeons in Silverdale, Dr. Duff ranks #6 by total Medicare procedure volume. The highest-volume surgeon in Silverdale has 182 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Duff practices?
St Michael Medical Center (4 out of 5 CMS stars, hip/knee complication rate similar to national average); Olympic Medical Center (3 out of 5 CMS stars, insufficient case volume for complication rate comparison). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Other Orthopedic Surgeons in Silverdale, Washington
Dr. Duff's 25 Medicare procedures are below the Silverdale average of 80. The table below compares verified procedure volumes for orthopedic surgeons practicing in Silverdale.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Omar Abdul-Hadi | 182 | Hip, Knee |
| Dr. Erin Moyer | 98 | Hip, Knee |
| Dr. Bradley Watters | 72 | Hip, Knee |
| Dr. Dawson Brown | 64 | Shoulder |
| Dr. Christopher Rankin | 40 | Shoulder |
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.