Dr. Gregory Deirmengian, MD
Dr. Gregory Deirmengian is a board-certified orthopedic surgeon practicing in King Of Prussia, Pennsylvania. Dr. Deirmengian has performed 108 Medicare-verified knee replacements (#28 in Pennsylvania) and 70 hip replacements, for a combined total of 178 procedures.
In Pennsylvania, Dr. Deirmengian performs well above average in knee (108 vs 45 avg), well above average in hip (70 vs 34 avg).
Dr. Deirmengian's reported Medicare volume is split between knee replacements (108 cases) and hip replacements (70 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 11 years of data. Over that period, recorded procedure volume increased from 80 to 178 in the most recent data, a 123% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,720 knee replacement surgeons tracked nationally, Dr. Deirmengian's 108 verified procedures is more than 2x the national average of 45.
Verified Medicare Cases
How is this estimated?
Medicare Part B fee-for-service claims represent approximately 33–37% of all joint replacements performed nationally (source: CMS data, AJRR). This range estimates the surgeon's total practice volume across all payers. The verified Medicare count above is the definitive, audited figure.
How Dr. Deirmengian Compares
Procedure volume compared to the Pennsylvania state average.
Contact & Location
King Of Prussia, PA 19406
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Deirmengian's Medicare-recorded procedure volume has trended upward over 11 years, increasing 123% from 80 procedures in 2013 to 178 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 178 Medicare-verified joint replacement procedures. This is more than 2x the Pennsylvania average of 63 procedures per surgeon. Dr. Deirmengian ranks #21 out of 388 orthopedic surgeons in Pennsylvania.
What types of joint replacement does Dr. Deirmengian perform?
Dr. Deirmengian's Medicare data shows procedures in knee replacement (108 cases) and hip replacement (70 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 the most recent Medicare Part B fee-for-service claims data, published by the Centers for Medicare and Medicaid Services (CMS). This captures approximately 33–37% of all joint replacements performed nationally. Dr. Deirmengian's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 178 procedures shown here.
Has Dr. Deirmengian's procedure volume changed over time?
Yes. Dr. Deirmengian's Medicare-recorded volume has increased from 80 procedures in 2013 to 178 in the most recent data, a 123% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 178 procedures in 2023.
Does Dr. Deirmengian perform more than one type of joint replacement?
Yes. Dr. Deirmengian's Medicare data shows procedures in knee replacement (108 cases), hip replacement (70 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, Inspira Medical Center Mullica Hill. 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); Inspira Medical Center Mullica Hill (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 King Of Prussia, Pennsylvania
Dr. Deirmengian's 178 Medicare procedures are below the King Of Prussia average of 188. The table below compares verified procedure volumes for orthopedic surgeons practicing in King Of Prussia.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Peter Sharkey | 270 | Hip, Knee |
| Dr. Matthew Ramsey | 117 | Shoulder |
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