Dr. John Mariani, DO
Contact & Location
Sewell, NJ 08080
Dr. John Mariani is a board-certified orthopedic surgeon practicing in Sewell, New Jersey. A Medicare provider since 2006, Dr. Mariani has performed 64 Medicare-verified knee replacements, ranking #39 in New Jersey.
In New Jersey, Dr. Mariani performs near average in knee (64 vs 54 avg).
Dr. Mariani's Medicare data shows a focused knee replacement practice with 64 verified procedures. Surgeons who concentrate on a single procedure type often develop deep procedural expertise, though total practice volume may include additional procedures not captured in Medicare fee-for-service data.
Sewell is home to 3 orthopedic surgeons in the current Medicare dataset. Patients in the Sewell area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Mariani extend back to 2013, covering 12 years of data. Over that period, recorded procedure volume increased from 49 to 64 in the most recent data, a 31% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,599 knee replacement surgeons tracked nationally, Dr. Mariani's 64 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. Mariani Compares
Procedure volume compared to the New Jersey state average.
Volume Trend Analysis
Dr. Mariani's Medicare-recorded procedure volume has trended upward over 12 years, increasing 31% from 49 procedures in 2013 to 64 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.
What to Expect on the Day of SurgeryA step-by-step walkthrough of your surgical day, from pre-op preparation through anesthesia, the procedure itself, and the first hours of recovery.
Nutrition and Recovery After Joint ReplacementHow protein intake, anti-inflammatory foods, hydration, and targeted supplements support bone healing and tissue repair after surgery.
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.
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. Mariani
How does Dr. Mariani's procedure volume compare to other New Jersey surgeons?
Dr. Mariani has performed 64 Medicare-verified joint replacement procedures. This is in line with the New Jersey average of 72 procedures per surgeon. Dr. Mariani ranks #67 out of 184 orthopedic surgeons in New Jersey.
What types of joint replacement does Dr. Mariani perform?
Dr. Mariani's reported Medicare volume is focused on knee replacement, with 64 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Mariani in Sewell?
Yes. There are 3 orthopedic surgeons in Sewell 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. Mariani 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. Mariani's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 64 procedures shown here.
Has Dr. Mariani's procedure volume changed over time?
Yes. Dr. Mariani's Medicare-recorded volume has increased from 49 procedures in 2013 to 64 in the most recent data, a 31% increase over 12 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 80 procedures in 2019.
Which hospitals is Dr. Mariani affiliated with?
According to CMS facility affiliation data, Dr. Mariani is affiliated with Jefferson Stratford Hospital, West Jersey Hospital.
How does Dr. Mariani compare to other orthopedic surgeons in Sewell?
Among the 3 orthopedic surgeons in Sewell, Dr. Mariani ranks #2 by total Medicare procedure volume. Dr. Mariani is among the highest-volume surgeons in Sewell.
What are the quality ratings for hospitals where Dr. Mariani practices?
Jefferson Stratford Hospital (2 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 Sewell, New Jersey
Dr. Mariani's 64 Medicare procedures are above the Sewell average of 51. The table below compares verified procedure volumes for orthopedic surgeons practicing in Sewell.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Luke Austin | 69 | Shoulder |
| Dr. Jeffrey Murray | 19 | 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.