Dr. Christopher Hajnik, M.D.
Contact & Location
760-943-6700
Encinitas, CA 92024
Dr. Hajnik performs more knee replacement procedures than 67% of orthopedic surgeons in California, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #159 of 491 ranked knee surgeons in California.
About Dr. Hajnik
Dr. Christopher Hajnik is a board-certified orthopedic surgeon practicing in Encinitas, California. A Medicare provider since 2008, Dr. Hajnik performed 46 Medicare-verified knee replacements (#159 in California) and 33 hip replacements in the latest annual CMS data, for a combined total of 79 procedures.
In California, Dr. Hajnik performs near the state average in knee (46 vs 47), near the state average in hip (33 vs 41).
Dr. Hajnik's reported Medicare volume is split between knee replacements (46 cases) and hip replacements (33 cases).
Beyond general orthopedic surgery, Dr. Hajnik holds additional credentials in Adult Reconstructive Orthopaedic Surgery, reflecting subspecialty training that may benefit patients with complex joint conditions.
Encinitas is home to 3 orthopedic surgeons in the current Medicare dataset. Patients in the Encinitas area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Hajnik extend back to 2013, covering 12 years of data. Over that period, recorded procedure volume increased from 59 to 79 in the most recent data, a 34% increase. This sustained growth reflects an expanding joint replacement practice.
Among 6,612 knee replacement surgeons tracked nationally, Dr. Hajnik's 46 verified procedures is near the national average of 45.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 18 | 41 |
| 2014 | 17 | 49 |
| 2015 | 24 | 51 |
| 2016 | 24 | 57 |
| 2017 | 26 | 60 |
| 2018 | 32 | 50 |
| 2019 | 48 | 58 |
| 2020 | 29 | 52 |
| 2021 | 18 | 42 |
| 2022 | 36 | 55 |
| 2023 | 52 | 45 |
| 2024 | 33 | 46 |
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 23% to 28% for knee replacement, 25% to 33% for hip 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. Hajnik Compares
Procedure volume compared to the California state average.
Volume Trend Analysis
Dr. Hajnik's Medicare-recorded procedure volume has trended upward over 12 years, increasing 34% from 59 procedures in 2013 to 79 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.
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. Hajnik
How does Dr. Hajnik's procedure volume compare to other California surgeons?
Dr. Hajnik has performed 79 Medicare-verified joint replacement procedures. This is in line with the California average of 68 procedures per surgeon. Dr. Hajnik ranks #163 out of 613 orthopedic surgeons in California.
What types of joint replacement does Dr. Hajnik perform?
Dr. Hajnik's Medicare data shows procedures in knee replacement (46 cases) and hip replacement (33 cases).
Are there other orthopedic surgeons near Dr. Hajnik in Encinitas?
Yes. There are 3 orthopedic surgeons in Encinitas 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. Hajnik 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 23% to 28% for knee replacement, 25% to 33% for hip replacement, which puts Dr. Hajnik's total volume across all insurers at roughly 260 to 330 procedures against the 79 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. Hajnik's procedure volume changed over time?
Yes. Dr. Hajnik's Medicare-recorded volume has increased from 59 procedures in 2013 to 79 in the most recent data, a 34% increase over 12 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 106 procedures in 2019.
Does Dr. Hajnik perform more than one type of joint replacement?
Yes. Dr. Hajnik's Medicare data shows procedures in knee replacement (46 cases), hip replacement (33 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Hajnik affiliated with?
According to CMS facility affiliation data, Dr. Hajnik is affiliated with Scripps Memorial Hospital - Encinitas.
How does Dr. Hajnik compare to other orthopedic surgeons in Encinitas?
Among the 3 orthopedic surgeons in Encinitas, Dr. Hajnik ranks #2 by total Medicare procedure volume. Dr. Hajnik is among the highest-volume surgeons in Encinitas.
What are the quality ratings for hospitals where Dr. Hajnik practices?
Scripps Memorial Hospital - Encinitas (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 Encinitas, California
Dr. Hajnik's 79 Medicare procedures are above the Encinitas average of 65. The table below compares verified procedure volumes for orthopedic surgeons practicing in Encinitas.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Morgan Silldorff | 96 | Hip, Knee |
| Dr. Nathan Hammel | 21 | 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.