Dr. Stephen Koss, MD
Dr. Stephen Koss is a board-certified orthopedic surgeon practicing in Hackettstown, New Jersey. A Medicare provider since 2006, Dr. Koss has performed 28 Medicare-verified knee replacements (#80 in New Jersey) and 19 shoulder replacements, for a combined total of 47 procedures.
In New Jersey, Dr. Koss performs below average in knee (28 vs 53 avg), below average in shoulder (19 vs 28 avg).
Dr. Koss's reported Medicare volume is split between knee replacements (28 cases) and shoulder replacements (19 cases).
Hackettstown is home to 4 orthopedic surgeons in the current Medicare dataset. Patients in the Hackettstown area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Koss extend back to 2013, covering 11 years of data. Over that period, recorded procedure volume increased from 11 to 47 in the most recent data, a 327% increase. This sustained growth reflects an expanding joint replacement practice.
Dr. Koss's 28 knee replacement procedures is below the national average of 45 among 6,720 surgeons. Medicare data captures roughly a third of all joint replacements, so actual volume is likely higher.
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. Koss Compares
Procedure volume compared to the New Jersey state average.
Contact & Location
Hackettstown, NJ 07840
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Koss's Medicare-recorded procedure volume has trended upward over 11 years, increasing 327% from 11 procedures in 2013 to 47 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. Koss
How does Dr. Koss's procedure volume compare to other New Jersey surgeons?
Dr. Koss has performed 47 Medicare-verified joint replacement procedures. The New Jersey average is 71 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Koss ranks #79 out of 182 orthopedic surgeons in New Jersey.
What types of joint replacement does Dr. Koss perform?
Dr. Koss's Medicare data shows procedures in knee replacement (28 cases) and shoulder replacement (19 cases).
Are there other orthopedic surgeons near Dr. Koss in Hackettstown?
Yes. There are 4 orthopedic surgeons in Hackettstown 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 New Jersey surgeons.
What does the Medicare data for Dr. Koss 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. Koss's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 47 procedures shown here.
Has Dr. Koss's procedure volume changed over time?
Yes. Dr. Koss's Medicare-recorded volume has increased from 11 procedures in 2013 to 47 in the most recent data, a 327% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 47 procedures in 2023.
Does Dr. Koss perform more than one type of joint replacement?
Yes. Dr. Koss's Medicare data shows procedures in knee replacement (28 cases), shoulder replacement (19 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Koss affiliated with?
According to CMS facility affiliation data, Dr. Koss is affiliated with Morristown Medical Center.
How does Dr. Koss compare to other orthopedic surgeons in Hackettstown?
Among the 4 orthopedic surgeons in Hackettstown, Dr. Koss ranks #2 by total Medicare procedure volume. Dr. Koss is among the highest-volume surgeons in Hackettstown.
What are the quality ratings for hospitals where Dr. Koss practices?
Morristown Medical Center (5 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 Hackettstown, New Jersey
Dr. Koss's 47 Medicare procedures are below the Hackettstown average of 105. The table below compares verified procedure volumes for orthopedic surgeons practicing in Hackettstown.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. John Dundon | 320 | Hip, Knee |
| Dr. Robert Masella | 41 | Hip, Knee |
| Dr. Michael Deehan | 13 | Knee |
Patient Reviews & Ratings
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