Dr. Donald Longjohn, M.D.
Contact & Location
323-442-5860
Los Angeles, CA 90033
Dr. Longjohn performs more knee replacement procedures than 53% of orthopedic surgeons in California, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #229 of 491 ranked knee surgeons in California.
About Dr. Longjohn
Practice. Dr. Donald Longjohn is a board-certified orthopedic surgeon practicing in Los Angeles, California. The latest annual CMS data records 33 knee replacements and 13 hip replacements, 46 procedures in all. That is #229 in California for knee replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2013 to 2024, 12 years. Volume has held between 38 and 64 procedures a year.
National context. Among 6,612 knee replacement surgeons tracked nationally, 33 procedures is below the national average of 45. Medicare covers part of all joint replacements, so true volume is likely higher.
Local context. Los Angeles has 34 orthopedic surgeons in the current Medicare data. Comparing volume and procedure mix across them is one way to narrow a shortlist.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 13 | 34 |
| 2014 | 11 | 41 |
| 2015 | 24 | 40 |
| 2016 | 15 | 38 |
| 2017 | 14 | 33 |
| 2018 | 15 | 30 |
| 2019 | 17 | 30 |
| 2020 | 12 | 26 |
| 2021 | 17 | 25 |
| 2022 | 18 | 28 |
| 2023 | 17 | 32 |
| 2024 | 13 | 33 |
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. Longjohn Compares
Procedure volume compared to the California state average.
Volume Trend Analysis
Dr. Longjohn's procedure volume has been consistent across 12 years of Medicare data, ranging from 38 to 64 procedures per year. This stability suggests a well-established joint replacement practice.
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.
Questions to Ask Your Surgeon Before Joint ReplacementA practical checklist of questions covering experience, technique, hospital choice, and recovery expectations to discuss during your surgical consultation.
Pain Management After Joint ReplacementA comprehensive guide to managing post-surgical pain through medication, physical therapy, cold therapy, and non-pharmacological strategies.
Outpatient Joint Replacement: A Medicare GuideHow outpatient joint replacement works under Medicare, including eligibility criteria, cost differences, and what to expect with same-day discharge.
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. Longjohn
How does Dr. Longjohn's procedure volume compare to other California surgeons?
Dr. Longjohn has performed 46 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. Longjohn ranks #295 out of 613 orthopedic surgeons in California.
What types of joint replacement does Dr. Longjohn perform?
Dr. Longjohn's Medicare data shows procedures in knee replacement (33 cases) and hip replacement (13 cases).
Are there other orthopedic surgeons near Dr. Longjohn in Los Angeles?
Yes. There are 34 orthopedic surgeons in Los Angeles 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. Longjohn 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. Longjohn's total volume across all insurers at roughly 160 to 200 procedures against the 46 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. Longjohn's procedure volume changed over time?
Dr. Longjohn's procedure volume has been relatively stable over 12 years of Medicare data, ranging from 38 to 64 procedures per year between 2013 and 2024. Consistent volume over multiple years reflects a steady joint replacement practice.
Does Dr. Longjohn perform more than one type of joint replacement?
Yes. Dr. Longjohn's Medicare data shows procedures in knee replacement (33 cases), hip replacement (13 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Longjohn affiliated with?
According to CMS facility affiliation data, Dr. Longjohn is affiliated with Keck Hospital Of Usc, Lac/Rancho Los Amigos National Rehabilitation Ctr, Glendale Adventist Medical Center, Usc Kenneth Norris Jr Cancer Hospital, Lac/Olive View-Ucla Medical Center.
How does Dr. Longjohn compare to other orthopedic surgeons in Los Angeles?
Among the 34 orthopedic surgeons in Los Angeles, Dr. Longjohn ranks #13 by total Medicare procedure volume. The highest-volume surgeon in Los Angeles has 211 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Longjohn practices?
Keck Hospital Of Usc (4 out of 5 CMS stars, hip/knee complication rate similar to national average); Lac/Rancho Los Amigos National Rehabilitation Ctr (3 out of 5 CMS stars, insufficient case volume for complication rate comparison); Glendale Adventist Medical Center (4 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 Los Angeles, California
Dr. Longjohn's 46 Medicare procedures are below the Los Angeles average of 111. The table below compares verified procedure volumes for orthopedic surgeons practicing in Los Angeles.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. John Tiberi | 211 | Hip, Knee |
| Dr. Daniel Oakes | 192 | Hip, Knee |
| Dr. Micah Adamson | 98 | Hip, Knee |
| Dr. Vishal Hegde | 97 | Hip, Knee |
| Dr. Andrew Spitzer | 71 | Hip, Knee |
| Dr. Adam Sassoon | 62 | Hip, 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.