Dr. Karl Christoffersen, MD
Dr. Karl Christoffersen is a board-certified orthopedic surgeon practicing in Santa Cruz, California. A Medicare provider since 2006, Dr. Christoffersen has performed 58 Medicare-verified knee replacements (#103 in California) and 28 hip replacements, for a combined total of 86 procedures.
In California, Dr. Christoffersen performs above average in knee (58 vs 45 avg), below average in hip (28 vs 41 avg).
Dr. Christoffersen's reported Medicare volume is split between knee replacements (58 cases) and hip replacements (28 cases).
Santa Cruz is home to 2 orthopedic surgeons in the current Medicare dataset. Patients in the Santa Cruz area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Christoffersen extend back to 2013, covering 11 years of data. Over that period, recorded procedure volume increased from 56 to 86 in the most recent data, a 54% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,720 knee replacement surgeons tracked nationally, Dr. Christoffersen's 58 verified procedures is above the national average of 45.
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. Christoffersen Compares
Procedure volume compared to the California state average.
Contact & Location
Santa Cruz, CA 95065
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Christoffersen's Medicare-recorded procedure volume has trended upward over 11 years, increasing 54% from 56 procedures in 2013 to 86 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.
Rehabilitation Roadmap: Your Complete Recovery GuideA structured physical therapy progression from the first post-op exercises through full strength and mobility restoration over 3 to 6 months.
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. Christoffersen
How does Dr. Christoffersen's procedure volume compare to other California surgeons?
Dr. Christoffersen has performed 86 Medicare-verified joint replacement procedures. This is in line with the California average of 65 procedures per surgeon. Dr. Christoffersen ranks #142 out of 608 orthopedic surgeons in California.
What types of joint replacement does Dr. Christoffersen perform?
Dr. Christoffersen's Medicare data shows procedures in knee replacement (58 cases) and hip replacement (28 cases).
Are there other orthopedic surgeons near Dr. Christoffersen in Santa Cruz?
Yes. There are 2 orthopedic surgeons in Santa Cruz 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. Christoffersen 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. Christoffersen's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 86 procedures shown here.
Has Dr. Christoffersen's procedure volume changed over time?
Yes. Dr. Christoffersen's Medicare-recorded volume has increased from 56 procedures in 2013 to 86 in the most recent data, a 54% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 86 procedures in 2023.
Does Dr. Christoffersen perform more than one type of joint replacement?
Yes. Dr. Christoffersen's Medicare data shows procedures in knee replacement (58 cases), hip replacement (28 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Christoffersen affiliated with?
According to CMS facility affiliation data, Dr. Christoffersen is affiliated with Sutter Maternity & Surgery Center Of Santa Cruz, Dominican Hospital.
What are the quality ratings for hospitals where Dr. Christoffersen practices?
Sutter Maternity & Surgery Center Of Santa Cruz (insufficient case volume for complication rate comparison); Dominican 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 Santa Cruz, California
Dr. Christoffersen's 86 Medicare procedures are above the Santa Cruz average of 51. The table below compares verified procedure volumes for orthopedic surgeons practicing in Santa Cruz.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Zefu Liu | 15 | Hip |
Patient Reviews & Ratings
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