Dr. Michael Dersam, M.D.
Contact & Location
602-588-4040
Phoenix, AZ 85016
Dr. Dersam performs more shoulder replacement procedures than 37% of orthopedic surgeons in Arizona, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #39 of 62 ranked shoulder surgeons in Arizona.
About Dr. Dersam
Practice. Dr. Michael Dersam is an orthopedic surgeon practicing in Phoenix, Arizona. The latest annual CMS data records 20 shoulder replacements and 15 knee replacements, 35 procedures in all. That is #39 in Arizona for shoulder replacement. A Medicare provider since 2005.
Trend. Medicare records run from 2019 to 2024, 6 years. Volume rose from 30 procedures a year to 35, up 17%.
National context. Among 2,217 shoulder replacement surgeons tracked nationally, 20 procedures is below the national average of 29. Medicare covers part of all joint replacements, so true volume is likely higher.
Local context. Phoenix has 51 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 | Knee Replacement | Shoulder Replacement |
|---|---|---|
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 16 | 14 |
| 2020 | 12 | 11 |
| 2021 | 0 | 14 |
| 2022 | 14 | 0 |
| 2023 | 11 | 13 |
| 2024 | 15 | 20 |
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, 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. Dersam Compares
Procedure volume compared to the Arizona state average.
Volume Trend Analysis
Dr. Dersam's Medicare-recorded procedure volume has trended upward over 6 years, increasing 17% from 30 procedures in 2019 to 35 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 step-by-step walkthrough of your surgical day, from pre-op preparation through anesthesia, the procedure itself, and the first hours of recovery.
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 Coverage for Joint ReplacementWhat Medicare Part A and Part B cover for joint replacement surgery, including hospital stays, surgeon fees, anesthesia, and physical therapy.
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. Dersam
How does Dr. Dersam's procedure volume compare to other Arizona surgeons?
Dr. Dersam has performed 35 Medicare-verified joint replacement procedures. The Arizona average is 72 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Dersam ranks #124 out of 191 orthopedic surgeons in Arizona.
What types of joint replacement does Dr. Dersam perform?
Dr. Dersam's Medicare data shows procedures in shoulder replacement (20 cases) and knee replacement (15 cases).
Are there other orthopedic surgeons near Dr. Dersam in Phoenix?
Yes. There are 51 orthopedic surgeons in Phoenix 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 Arizona surgeons.
What does the Medicare data for Dr. Dersam 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, 23% to 28% for knee replacement, which puts Dr. Dersam's total volume across all insurers at roughly 110 to 130 procedures against the 35 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. Dersam's procedure volume changed over time?
Yes. Dr. Dersam's Medicare-recorded volume has increased from 30 procedures in 2019 to 35 in the most recent data, a 17% increase over 6 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 35 procedures in 2024.
Does Dr. Dersam perform more than one type of joint replacement?
Yes. Dr. Dersam's Medicare data shows procedures in shoulder replacement (20 cases), knee replacement (15 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Dersam affiliated with?
According to CMS facility affiliation data, Dr. Dersam is affiliated with Yuma Regional Medical Center, Honorhealth Scottsdale Thompson Peak Med Ctr, Honorhealth Scottsdale Shea Medical Center, Honorhealth John C. Lincoln Medical Center.
How does Dr. Dersam compare to other orthopedic surgeons in Phoenix?
Among the 51 orthopedic surgeons in Phoenix, Dr. Dersam ranks #33 by total Medicare procedure volume. The highest-volume surgeon in Phoenix has 234 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Dersam practices?
Yuma Regional Medical Center (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Honorhealth Scottsdale Thompson Peak Med Ctr (4 out of 5 CMS stars, hip/knee complication rate similar to national average); Honorhealth Scottsdale Shea Medical Center (3 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 Phoenix, Arizona
Dr. Dersam's 35 Medicare procedures are below the Phoenix average of 139. The table below compares verified procedure volumes for orthopedic surgeons practicing in Phoenix.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Steven Werner | 234 | Hip, Knee |
| Dr. Christina Khoury | 152 | Hip, Knee |
| Dr. Steven Hattrup | 147 | Shoulder |
| Dr. Michael Wilmink | 144 | Hip, Knee |
| Dr. Kenneth Schmidt | 135 | Hip, Knee |
| Dr. Lige Kaplan | 128 | Hip, 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.