Dr. Mark Theiss, M.D.
Contact & Location
Falls Church, VA 22042
Dr. Mark Theiss is a board-certified orthopedic surgeon practicing in Falls Church, Virginia. A Medicare provider since 2006, Dr. Theiss has performed 18 Medicare-verified hip replacements (#106 in Virginia) and 13 knee replacements, for a combined total of 31 procedures.
In Virginia, Dr. Theiss performs below average in hip (18 vs 47 avg), below average in knee (13 vs 58 avg).
Dr. Theiss's reported Medicare volume is split between hip replacements (18 cases) and knee replacements (13 cases).
Dr. Theiss is the only orthopedic surgeon in Falls Church represented in the current Medicare dataset, serving as the primary local option for patients considering joint replacement surgery in the area.
Medicare records for Dr. Theiss extend back to 2013, covering 9 years of data. Over that period, recorded procedure volume increased from 11 to 31 in the most recent data, a 182% increase. This sustained growth reflects an expanding joint replacement practice.
Dr. Theiss's 18 hip replacement procedures is below the national average of 36 among 4,532 surgeons. Medicare data captures roughly a third of all joint replacements, so actual volume is likely higher.
Verified Case Volume Trends (2013-Current)
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. 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 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. Theiss's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 31 procedures shown here.
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.