Dr. John Nelligan, MD
Dr. John Nelligan is a board-certified orthopedic surgeon practicing in Sonora, California. A Medicare provider since 2006, Dr. Nelligan has performed 25 Medicare-verified knee replacements (#298 in California) and 25 hip replacements, for a combined total of 50 procedures.
In California, Dr. Nelligan performs below average in knee (25 vs 45 avg), below average in hip (25 vs 41 avg).
Dr. Nelligan's reported Medicare volume is split between knee replacements (25 cases) and hip replacements (25 cases).
Beyond general orthopedic surgery, Dr. Nelligan 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. Nelligan extend back to 2013, covering 11 years of data. Over that period, recorded procedure volume increased from 15 to 50 in the most recent data, a 233% increase. This sustained growth reflects an expanding joint replacement practice.
Dr. Nelligan's 25 hip replacement procedures is below the national average of 36 among 4,526 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. Nelligan Compares
Procedure volume compared to the California state average.
Contact & Location
Sonora, CA 95370
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Nelligan's Medicare-recorded procedure volume has trended upward over 11 years, increasing 233% from 15 procedures in 2013 to 50 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 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.
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.
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. Nelligan
How does Dr. Nelligan's procedure volume compare to other California surgeons?
Dr. Nelligan has performed 50 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. Nelligan ranks #255 out of 608 orthopedic surgeons in California.
What types of joint replacement does Dr. Nelligan perform?
Dr. Nelligan's Medicare data shows procedures in knee replacement (25 cases) and hip replacement (25 cases).
Are there other orthopedic surgeons near Dr. Nelligan 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. Nelligan 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. Nelligan's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 50 procedures shown here.
Has Dr. Nelligan's procedure volume changed over time?
Yes. Dr. Nelligan's Medicare-recorded volume has increased from 15 procedures in 2013 to 50 in the most recent data, a 233% increase over 11 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 50 procedures in 2023.
Does Dr. Nelligan perform more than one type of joint replacement?
Yes. Dr. Nelligan's Medicare data shows procedures in knee replacement (25 cases), hip replacement (25 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Nelligan affiliated with?
According to CMS facility affiliation data, Dr. Nelligan is affiliated with Adventist Health Sonora.
How does Dr. Nelligan compare to other orthopedic surgeons in Sonora?
Among the 3 orthopedic surgeons in Sonora, Dr. Nelligan ranks #2 by total Medicare procedure volume. Dr. Nelligan is among the highest-volume surgeons in Sonora.
What are the quality ratings for hospitals where Dr. Nelligan practices?
Adventist Health Sonora (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. Nelligan's 50 Medicare procedures are above 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. Ariana Demers | 41 | Hip, Knee |
Patient Reviews & Ratings
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