Dr. Ariana Demers, D.O.
Dr. Ariana Demers is a board-certified orthopedic surgeon practicing in Sonora, California. A Medicare provider since 2007, Dr. Demers has performed 23 Medicare-verified knee replacements (#311 in California) and 18 hip replacements, for a combined total of 41 procedures.
In California, Dr. Demers performs below average in knee (23 vs 45 avg), below average in hip (18 vs 41 avg).
Dr. Demers's reported Medicare volume is split between knee replacements (23 cases) and hip replacements (18 cases).
Beyond general orthopedic surgery, Dr. Demers holds additional credentials in Sports Medicine, reflecting subspecialty training that may benefit patients with complex joint conditions.
Sonora is home to 3 orthopedic surgeons in the current Medicare dataset. Patients in the Sonora area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Medicare records for Dr. Demers extend back to 2013, covering 9 years of data. Over that period, recorded procedure volume increased from 22 to 41 in the most recent data, a 86% increase. This sustained growth reflects an expanding joint replacement practice.
Dr. Demers's 23 knee replacement procedures is below the national average of 45 among 6,720 surgeons. Medicare data captures roughly a third of all joint replacements, so actual volume is likely higher.
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. Demers Compares
Procedure volume compared to the California state average.
Contact & Location
Sonora, CA 95370
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Demers's Medicare-recorded procedure volume has trended upward over 9 years, increasing 86% from 22 procedures in 2013 to 41 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. Demers
How does Dr. Demers's procedure volume compare to other California surgeons?
Dr. Demers has performed 41 Medicare-verified joint replacement procedures. The California average is 65 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Demers ranks #306 out of 608 orthopedic surgeons in California.
What types of joint replacement does Dr. Demers perform?
Dr. Demers's Medicare data shows procedures in knee replacement (23 cases) and hip replacement (18 cases).
Are there other orthopedic surgeons near Dr. Demers in Sonora?
Yes. There are 3 orthopedic surgeons in Sonora 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. Demers 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. Demers's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 41 procedures shown here.
Has Dr. Demers's procedure volume changed over time?
Yes. Dr. Demers's Medicare-recorded volume has increased from 22 procedures in 2013 to 41 in the most recent data, a 86% increase over 9 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 41 procedures in 2023.
Does Dr. Demers perform more than one type of joint replacement?
Yes. Dr. Demers's Medicare data shows procedures in knee replacement (23 cases), hip replacement (18 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Demers affiliated with?
According to CMS facility affiliation data, Dr. Demers is affiliated with Adventist Health Sonora, Mark Twain Medical Center.
How does Dr. Demers compare to other orthopedic surgeons in Sonora?
Among the 3 orthopedic surgeons in Sonora, Dr. Demers ranks #3 by total Medicare procedure volume. Dr. Demers is among the highest-volume surgeons in Sonora.
What are the quality ratings for hospitals where Dr. Demers practices?
Adventist Health Sonora (3 out of 5 CMS stars, insufficient case volume for complication rate comparison); Mark Twain Medical Center (3 out of 5 CMS stars, insufficient case volume for complication rate comparison). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Other Orthopedic Surgeons in Sonora, California
Dr. Demers's 41 Medicare procedures are below the Sonora average of 48. The table below compares verified procedure volumes for orthopedic surgeons practicing in Sonora.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. James Boyd | 52 | Knee, Shoulder |
| Dr. John Nelligan | 50 | Hip, Knee |
Patient Reviews & Ratings
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