Dr. Mark Theiss, M.D.
Contact & Location
703-776-4001
Falls Church, VA 22042
Dr. Theiss performs more hip replacement procedures than 15% of orthopedic surgeons in Virginia, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #106 of 126 ranked hip surgeons in Virginia.
About Dr. Theiss
Practice. Dr. Mark Theiss is a board-certified orthopedic surgeon practicing in Falls Church, Virginia. The latest annual CMS data records 18 hip replacements and 13 knee replacements, 31 procedures in all. That is #106 in Virginia for hip replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2013 to 2024, 9 years. Volume rose from 11 procedures a year to 31, up 182%.
National context. Among 4,542 hip replacement surgeons tracked nationally, 18 procedures is below the national average of 36. Medicare covers part of all joint replacements, so true volume is likely higher.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 0 | 11 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 12 | 17 |
| 2017 | 0 | 17 |
| 2018 | 0 | 0 |
| 2019 | 11 | 23 |
| 2020 | 12 | 15 |
| 2021 | 14 | 20 |
| 2022 | 11 | 29 |
| 2023 | 11 | 21 |
| 2024 | 18 | 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 25% to 33% for hip replacement, 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. Theiss Compares
Procedure volume compared to the Virginia state average.
Volume Trend Analysis
Dr. Theiss's Medicare-recorded procedure volume has trended upward over 9 years, increasing 182% from 11 procedures in 2013 to 31 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.
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.
Nutrition and Recovery After Joint ReplacementHow protein intake, anti-inflammatory foods, hydration, and targeted supplements support bone healing and tissue repair after surgery.
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.
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. Theiss
How does Dr. Theiss's procedure volume compare to other Virginia surgeons?
Dr. Theiss has performed 31 Medicare-verified joint replacement procedures. The Virginia average is 82 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Theiss ranks #166 out of 229 orthopedic surgeons in Virginia.
What types of joint replacement does Dr. Theiss perform?
Dr. Theiss's Medicare data shows procedures in hip replacement (18 cases) and knee replacement (13 cases).
Where is Dr. Theiss's practice located?
Dr. Theiss practices in Falls Church, Virginia. The office is located at 3300 Gallows Rd, Falls Church, VA 22042. Patients in the surrounding area can consult Dr. Theiss for joint replacement evaluation.
What does the Medicare data for Dr. Theiss 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 25% to 33% for hip replacement, 23% to 28% for knee replacement, which puts Dr. Theiss's total volume across all insurers at roughly 100 to 130 procedures against the 31 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. Theiss's procedure volume changed over time?
Yes. Dr. Theiss's Medicare-recorded volume has increased from 11 procedures in 2013 to 31 in the most recent data, a 182% increase over 9 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 40 procedures in 2022.
Does Dr. Theiss perform more than one type of joint replacement?
Yes. Dr. Theiss's Medicare data shows procedures in hip replacement (18 cases), knee replacement (13 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Theiss affiliated with?
According to CMS facility affiliation data, Dr. Theiss is affiliated with Inova Alexandria Hospital.
What are the quality ratings for hospitals where Dr. Theiss practices?
Inova Alexandria Hospital (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.
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.