Dr. Gregory Deirmengian, MD
Contact & Location
267-339-3558
King Of Prussia, PA 19406
Marlton, NJ 08053
Sewell, NJ 08080
Dr. Deirmengian performs more knee replacement procedures than 91% of orthopedic surgeons in Pennsylvania, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #25 of 308 ranked knee surgeons in Pennsylvania.
About Dr. Deirmengian
Dr. Gregory Deirmengian is a board-certified orthopedic surgeon practicing in King Of Prussia, Pennsylvania. A Medicare provider since 2006, Dr. Deirmengian performed 114 Medicare-verified knee replacements (#25 in Pennsylvania) and 82 hip replacements in the latest annual CMS data, for a combined total of 196 procedures.
In Pennsylvania, Dr. Deirmengian performs well above the state average in knee (114 vs 47), well above the state average in hip (82 vs 37).
Dr. Deirmengian's reported Medicare volume is split between knee replacements (114 cases) and hip replacements (82 cases).
King Of Prussia is home to 3 orthopedic surgeons in the current Medicare dataset. Patients in the King Of Prussia area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs. Dr. Deirmengian also maintains hospital privileges in NJ and PA, indicating a regional practice that extends beyond Pennsylvania.
Medicare records for Dr. Deirmengian extend back to 2013, covering 12 years of data. Over that period, recorded procedure volume increased from 80 to 196 in the most recent data, a 145% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,599 knee replacement surgeons tracked nationally, Dr. Deirmengian's 114 verified procedures is more than 2x the national average of 45.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 52 | 28 |
| 2014 | 37 | 46 |
| 2015 | 58 | 72 |
| 2016 | 79 | 69 |
| 2017 | 69 | 64 |
| 2018 | 61 | 85 |
| 2019 | 64 | 84 |
| 2020 | 53 | 54 |
| 2021 | 53 | 77 |
| 2022 | 56 | 92 |
| 2023 | 70 | 108 |
| 2024 | 82 | 114 |
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. 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. Deirmengian Compares
Procedure volume compared to the Pennsylvania state average.
Volume Trend Analysis
Dr. Deirmengian's Medicare-recorded procedure volume has trended upward over 12 years, increasing 145% from 80 procedures in 2013 to 196 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.
Questions to Ask Your Surgeon Before Joint ReplacementA practical checklist of questions covering experience, technique, hospital choice, and recovery expectations to discuss during your surgical consultation.
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.
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.
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. Deirmengian
How does Dr. Deirmengian's procedure volume compare to other Pennsylvania surgeons?
Dr. Deirmengian has performed 196 Medicare-verified joint replacement procedures. This is more than 2x the Pennsylvania average of 66 procedures per surgeon. Dr. Deirmengian ranks #19 out of 376 orthopedic surgeons in Pennsylvania.
What types of joint replacement does Dr. Deirmengian perform?
Dr. Deirmengian's Medicare data shows procedures in knee replacement (114 cases) and hip replacement (82 cases).
Are there other orthopedic surgeons near Dr. Deirmengian in King Of Prussia?
Yes. There are 3 orthopedic surgeons in King Of Prussia 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 Pennsylvania surgeons.
What does the Medicare data for Dr. Deirmengian 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, which puts Dr. Deirmengian's total volume across all insurers at roughly 660 to 820 procedures against the 196 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. Deirmengian's procedure volume changed over time?
Yes. Dr. Deirmengian's Medicare-recorded volume has increased from 80 procedures in 2013 to 196 in the most recent data, a 145% increase over 12 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 196 procedures in 2024.
Does Dr. Deirmengian perform more than one type of joint replacement?
Yes. Dr. Deirmengian's Medicare data shows procedures in knee replacement (114 cases), hip replacement (82 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Deirmengian affiliated with?
According to CMS facility affiliation data, Dr. Deirmengian is affiliated with Jefferson Stratford Hospital, Thomas Jefferson University Hospital, West Jersey Hospital, Inspira Medical Center Mullica Hill, Inspira Medical Center Vineland. Dr. Deirmengian maintains hospital privileges across state lines, indicating a practice that serves patients in multiple states.
How does Dr. Deirmengian compare to other orthopedic surgeons in King Of Prussia?
Among the 3 orthopedic surgeons in King Of Prussia, Dr. Deirmengian ranks #2 by total Medicare procedure volume. Dr. Deirmengian is among the highest-volume surgeons in King Of Prussia.
What are the quality ratings for hospitals where Dr. Deirmengian practices?
Jefferson Stratford Hospital (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Thomas Jefferson University Hospital (3 out of 5 CMS stars, hip/knee complication rate similar to national average); West Jersey Hospital (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 King Of Prussia, Pennsylvania
Dr. Deirmengian's 196 Medicare procedures are above the King Of Prussia average of 170. The table below compares verified procedure volumes for orthopedic surgeons practicing in King Of Prussia.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Peter Sharkey | 212 | Hip, Knee |
| Dr. Matthew Ramsey | 102 | 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.