Dr. Jennifer Van Warmerdam, M.D.
Contact & Location
415-221-0665
San Francisco, CA 94117
About Dr. Van Warmerdam
Dr. Jennifer Van Warmerdam is a board-certified orthopedic surgeon practicing in San Francisco, California. A Medicare provider since 2009, Dr. Van Warmerdam performed 30 Medicare-verified hip replacements (#162 in California) and 29 knee replacements in the latest annual CMS data, for a combined total of 59 procedures.
In California, Dr. Van Warmerdam performs below the state average in hip (30 vs 41), below the state average in knee (29 vs 47).
Dr. Van Warmerdam's reported Medicare volume is split between hip replacements (30 cases) and knee replacements (29 cases).
San Francisco is home to 23 orthopedic surgeons in the current Medicare dataset. Patients in the San Francisco area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Dr. Van Warmerdam's Medicare record spans 12 years from 2013 through 2024. Procedure volume has remained consistent during that period, ranging from 14 to 62 procedures per year, reflecting a steady joint replacement practice.
Among 4,532 hip replacement surgeons tracked nationally, Dr. Van Warmerdam's 30 verified procedures is near the national average of 36.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 41 | 21 |
| 2014 | 19 | 12 |
| 2015 | 18 | 20 |
| 2016 | 29 | 30 |
| 2017 | 24 | 21 |
| 2018 | 23 | 0 |
| 2019 | 20 | 11 |
| 2020 | 14 | 0 |
| 2021 | 34 | 15 |
| 2022 | 32 | 21 |
| 2023 | 28 | 29 |
| 2024 | 30 | 29 |
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. Van Warmerdam Compares
Procedure volume compared to the California state average.
Volume Trend Analysis
Dr. Van Warmerdam's procedure volume has been consistent across 12 years of Medicare data, ranging from 14 to 62 procedures per year. This stability suggests a well-established joint replacement practice.
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 Hip Replacement
If you are considering hip replacement surgery, these evidence-based guides can help you prepare and recover:
Understanding the progression from conservative treatments to surgical intervention, and how to determine when hip replacement becomes the right choice.
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.
Pain Management After Joint ReplacementA comprehensive guide to managing post-surgical pain through medication, physical therapy, cold therapy, and non-pharmacological strategies.
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.
Hip Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after hip replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full hip replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Van Warmerdam
How does Dr. Van Warmerdam's procedure volume compare to other California surgeons?
Dr. Van Warmerdam has performed 59 Medicare-verified joint replacement procedures. This is in line with the California average of 68 procedures per surgeon. Dr. Van Warmerdam ranks #235 out of 613 orthopedic surgeons in California.
What types of joint replacement does Dr. Van Warmerdam perform?
Dr. Van Warmerdam's Medicare data shows procedures in hip replacement (30 cases) and knee replacement (29 cases).
Are there other orthopedic surgeons near Dr. Van Warmerdam in San Francisco?
Yes. There are 23 orthopedic surgeons in San Francisco 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 California surgeons.
What does the Medicare data for Dr. Van Warmerdam 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. Van Warmerdam's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 59 procedures shown here.
Has Dr. Van Warmerdam's procedure volume changed over time?
Dr. Van Warmerdam's procedure volume has been relatively stable over 12 years of Medicare data, ranging from 14 to 62 procedures per year between 2013 and 2024. Consistent volume over multiple years reflects a steady joint replacement practice.
Does Dr. Van Warmerdam perform more than one type of joint replacement?
Yes. Dr. Van Warmerdam's Medicare data shows procedures in hip replacement (30 cases), knee replacement (29 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Van Warmerdam affiliated with?
According to CMS facility affiliation data, Dr. Van Warmerdam is affiliated with Ucsf Health St. Mary'S Hospital, Ucsf Medical Center, Novato Community Hospital, Marinhealth Medical Center.
How does Dr. Van Warmerdam compare to other orthopedic surgeons in San Francisco?
Among the 23 orthopedic surgeons in San Francisco, Dr. Van Warmerdam ranks #9 by total Medicare procedure volume. The highest-volume surgeon in San Francisco has 201 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Van Warmerdam practices?
Ucsf Health St. Mary'S Hospital (4 out of 5 CMS stars, hip/knee complication rate similar to national average); Ucsf Medical Center (5 out of 5 CMS stars, hip/knee complication rate similar to national average); Novato Community Hospital (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 San Francisco, California
Dr. Van Warmerdam's 59 Medicare procedures are below the San Francisco average of 135. The table below compares verified procedure volumes for orthopedic surgeons practicing in San Francisco.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Jeffrey Barry | 201 | Hip, Knee |
| Dr. Derek Ward | 190 | Hip, Knee |
| Dr. Peter Callander | 177 | Hip, Knee |
| Dr. Erik Hansen | 133 | Hip, Knee |
| Dr. Christopher Cox | 95 | Hip, Knee |
| Dr. John Belzer | 88 | Knee, 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.