Dr. Robert Kohen, M.D.
Contact & Location
Warren, MI 48092
Dr. Robert Kohen is a board-certified orthopedic surgeon practicing in Warren, Michigan. A Medicare provider since 2007, Dr. Kohen has performed 56 Medicare-verified knee replacements (#30 in Michigan) and 17 shoulder replacements, for a combined total of 73 procedures.
In Michigan, Dr. Kohen performs above average in knee (56 vs 34 avg), below average in shoulder (17 vs 28 avg).
Dr. Kohen's practice is heavily focused on knee replacement surgery, which accounts for 77% of reported Medicare volume.
Warren is home to 5 orthopedic surgeons in the current Medicare dataset. Patients in the Warren area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Kohen extend back to 2014, covering 11 years of data. Over that period, recorded procedure volume increased from 22 to 73 in the most recent data, a 232% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,599 knee replacement surgeons tracked nationally, Dr. Kohen's 56 verified procedures is above the national average of 45.
Verified Case Volume Trends (2013-Current)
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. Kohen Compares
Procedure volume compared to the Michigan state average.
Volume Trend Analysis
Dr. Kohen's Medicare-recorded procedure volume has trended upward over 11 years, increasing 232% from 22 procedures in 2014 to 73 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.
Pain Management After Joint ReplacementA comprehensive guide to managing post-surgical pain through medication, physical therapy, cold therapy, and non-pharmacological strategies.
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. Kohen
How does Dr. Kohen's procedure volume compare to other Michigan surgeons?
Dr. Kohen has performed 73 Medicare-verified joint replacement procedures. This is in line with the Michigan average of 49 procedures per surgeon. Dr. Kohen ranks #50 out of 256 orthopedic surgeons in Michigan.
What types of joint replacement does Dr. Kohen perform?
Dr. Kohen's Medicare data shows procedures in knee replacement (56 cases) and shoulder replacement (17 cases).
Are there other orthopedic surgeons near Dr. Kohen in Warren?
Yes. There are 5 orthopedic surgeons in Warren 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 Michigan surgeons.
What does the Medicare data for Dr. Kohen 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. Kohen's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 73 procedures shown here.
Has Dr. Kohen's procedure volume changed over time?
Yes. Dr. Kohen's Medicare-recorded volume has increased from 22 procedures in 2014 to 73 in the most recent data, a 232% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 73 procedures in 2024.
Does Dr. Kohen perform more than one type of joint replacement?
Yes. Dr. Kohen's Medicare data shows procedures in knee replacement (56 cases), shoulder replacement (17 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Kohen affiliated with?
According to CMS facility affiliation data, Dr. Kohen is affiliated with Trinity Health Oakland Hospital, Corewell Health William Beaumont University Hospit, Corewell Health Farmington Hills Hospital.
How does Dr. Kohen compare to other orthopedic surgeons in Warren?
Among the 5 orthopedic surgeons in Warren, Dr. Kohen ranks #1 by total Medicare procedure volume. Dr. Kohen has the highest verified Medicare volume in the city.
What are the quality ratings for hospitals where Dr. Kohen practices?
Trinity Health Oakland Hospital (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Corewell Health William Beaumont University Hospit (3 out of 5 CMS stars, hip/knee complication rate similar to national average); Corewell Health Farmington Hills Hospital (2 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 Warren, Michigan
Dr. Kohen's 73 Medicare procedures are above the Warren average of 33. The table below compares verified procedure volumes for orthopedic surgeons practicing in Warren.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Jeffrey Mendelson | 33 | Hip, Knee |
| Dr. David Mendelson | 31 | Knee |
| Dr. Ronald Rook | 15 | Knee |
| Dr. Steven Plomaritis | 12 | 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.