Dr. Jennifer Van Warmerdam, M.D.
Contact & Location
415-221-0665
San Francisco, CA 94117
Dr. Van Warmerdam performs more hip replacement procedures than 53% of orthopedic surgeons in California, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #162 of 348 ranked hip surgeons in California.
About Dr. Van Warmerdam
Practice. Dr. Jennifer Van Warmerdam is an orthopedic surgeon practicing in San Francisco, California. The latest annual CMS data records 30 hip replacements and 29 knee replacements, 59 procedures in all. That is #162 in California for hip replacement. A Medicare provider since 2009.
Trend. Medicare records run from 2013 to 2024, 12 years. Volume has held between 14 and 62 procedures a year.
National context. Among 4,542 hip replacement surgeons tracked nationally, 30 procedures is near the national average of 36.
Local context. San Francisco has 23 orthopedic surgeons in the current Medicare data. Comparing volume and procedure mix across them is one way to narrow a shortlist.
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 are one payer stream among several, and the share they represent differs by procedure. In 2024 it was 25% to 33% for hip replacement, 23% to 28% for knee replacement. Each verified count above is divided by its own procedure's range, and the results are added, to estimate total practice volume across all payers. The verified Medicare count is the definitive, audited figure; this is a range derived from published national volume projections, not a measurement, and an individual practice can sit well outside it: how these ranges are derived, and their sources.
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 2024 Medicare Part B fee-for-service claims data, published by the Centers for Medicare and Medicaid Services (CMS). Medicare fee-for-service is only one payer stream, and the share of national volume it represents differs by procedure. In 2024 the share was 25% to 33% for hip replacement, 23% to 28% for knee replacement, which puts Dr. Van Warmerdam's total volume across all insurers at roughly 190 to 250 procedures against the 59 verified here. Those shares are derived from published national volume projections rather than quoted from a single publication, and they are estimates with real uncertainty. The OrthoProcedures methodology page shows the full derivation, the sources, and the limits at orthoprocedures.com/data-methodology.html.
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 Stanyan Hospital, Ucsf Medical Center, California Pacific Medical Center- Van Ness Campus, Sonoma Valley 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 Stanyan 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); California Pacific Medical Center- Van Ness Campus (3 out of 5 CMS stars). 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.