Dr. Donald Allyn, M.D.
Contact & Location
559-584-3000
Hanford, CA 93230
Dr. Allyn performs more knee replacement procedures than 7% of orthopedic surgeons in California, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #453 of 491 ranked knee surgeons in California.
About Dr. Allyn
Dr. Donald Allyn is a board-certified orthopedic surgeon practicing in Hanford, California. A Medicare provider since 2006, Dr. Allyn performed 13 Medicare-verified knee replacements in the latest annual CMS data, ranking #453 in California.
In California, Dr. Allyn performs below the state average in knee (13 vs 47).
Dr. Allyn's Medicare data shows a focused knee replacement practice with 13 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.
Hanford is home to 2 orthopedic surgeons in the current Medicare dataset. Patients in the Hanford area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Dr. Allyn's Medicare data spans 10 years, beginning in 2015. Volume peaked at 33 procedures in 2019 before settling at 13 in the most recent data. Changes in Medicare reporting, payer mix shifts, or practice focus adjustments can all influence year-to-year volume.
Dr. Allyn's 13 knee replacement procedures is below the national average of 45 among 6,612 surgeons. Medicare data captures roughly a third of all joint replacements, so actual volume is likely higher.
Verified Case Volume Trends (2013-Current)
| Year | Knee Replacement |
|---|---|
| 2013 | 0 |
| 2014 | 0 |
| 2015 | 16 |
| 2016 | 19 |
| 2017 | 27 |
| 2018 | 29 |
| 2019 | 33 |
| 2020 | 18 |
| 2021 | 30 |
| 2022 | 25 |
| 2023 | 21 |
| 2024 | 13 |
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. 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. Allyn Compares
Procedure volume compared to the California state average.
Volume Trend Analysis
Dr. Allyn's recorded volume peaked at 33 procedures in 2019 and stood at 13 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.
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.
Recovery Timeline: Week-by-Week ExpectationsA detailed week-by-week guide covering pain levels, mobility milestones, physical therapy progression, and when to expect a return to daily activities.
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. Allyn
How does Dr. Allyn's procedure volume compare to other California surgeons?
Dr. Allyn has performed 13 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. Allyn ranks #559 out of 613 orthopedic surgeons in California.
What types of joint replacement does Dr. Allyn perform?
Dr. Allyn's reported Medicare volume is focused on knee replacement, with 13 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Allyn in Hanford?
Yes. There are 2 orthopedic surgeons in Hanford 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. Allyn 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, which puts Dr. Allyn's total volume across all insurers at roughly 50 to 60 procedures against the 13 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. Allyn's procedure volume changed over time?
Dr. Allyn's Medicare-recorded volume peaked at 33 procedures in 2019 and was 13 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. Allyn affiliated with?
According to CMS facility affiliation data, Dr. Allyn is affiliated with Adventist Health Hanford, Adventist Health Reedley, Adventist Health Tulare, Kaweah Health Medical Center.
What are the quality ratings for hospitals where Dr. Allyn practices?
Adventist Health Hanford (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Adventist Health Tulare (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 Hanford, California
Dr. Allyn's 13 Medicare procedures are below the Hanford average of 45. The table below compares verified procedure volumes for orthopedic surgeons practicing in Hanford.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Kenny Mai | 76 | Hip, Knee, Shoulder |
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.