Dr. William Rumack, M.D.
Contact & Location
West Hills, CA 91307
Dr. William Rumack is a board-certified orthopedic surgeon practicing in West Hills, California. Dr. Rumack has performed 12 Medicare-verified knee replacements, ranking #476 in California.
In California, Dr. Rumack performs below average in knee (12 vs 47 avg).
Dr. Rumack's Medicare data shows a focused knee replacement practice with 12 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.
West Hills is home to 6 orthopedic surgeons in the current Medicare dataset. Patients in the West Hills area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Dr. Rumack's Medicare data spans 10 years, beginning in 2013. Volume peaked at 33 procedures in 2017 before settling at 12 in the most recent data. Changes in Medicare reporting, payer mix shifts, or practice focus adjustments can all influence year-to-year volume.
Dr. Rumack's 12 knee replacement procedures is below the national average of 45 among 6,599 surgeons. Medicare data captures roughly a third of all joint replacements, so actual volume is likely higher.
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. Rumack Compares
Procedure volume compared to the California state average.
Volume Trend Analysis
Dr. Rumack's recorded volume peaked at 33 procedures in 2017 and stood at 12 in the most recent data. Year-to-year variation can reflect changes in payer mix, practice scope, or Medicare billing patterns.
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. Rumack
How does Dr. Rumack's procedure volume compare to other California surgeons?
Dr. Rumack has performed 12 Medicare-verified joint replacement procedures. The California average is 68 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Rumack ranks #590 out of 613 orthopedic surgeons in California.
What types of joint replacement does Dr. Rumack perform?
Dr. Rumack's reported Medicare volume is focused on knee replacement, with 12 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Rumack in West Hills?
Yes. There are 6 orthopedic surgeons in West Hills 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. Rumack 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. Rumack's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 12 procedures shown here.
Has Dr. Rumack's procedure volume changed over time?
Dr. Rumack's Medicare-recorded volume peaked at 33 procedures in 2017 and was 12 in the most recent data. Volume fluctuations can reflect changes in payer mix, practice focus, or Medicare reporting rather than a change in overall surgical activity.
Which hospitals is Dr. Rumack affiliated with?
According to CMS facility affiliation data, Dr. Rumack is affiliated with Ucla West Valley Medical Center.
How does Dr. Rumack compare to other orthopedic surgeons in West Hills?
Among the 6 orthopedic surgeons in West Hills, Dr. Rumack ranks #6 by total Medicare procedure volume. The highest-volume surgeon in West Hills has 87 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Rumack practices?
Ucla West Valley Medical Center (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 West Hills, California
Dr. Rumack's 12 Medicare procedures are below the West Hills average of 37. The table below compares verified procedure volumes for orthopedic surgeons practicing in West Hills.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Nirav Shah | 87 | Hip, Knee |
| Dr. Sumit Rana | 70 | Hip, Knee |
| Dr. David Feingold | 25 | Knee |
| Dr. Aneet Toor | 17 | Shoulder |
| Dr. Michael Lee | 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.