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Physician Market Structure, Patient Outcomes, and Spending: An Examination of Medicare Beneficiaries
Thomas Koch1, Brett Wendling1, Nathan E Wilson1
1Bureau of Economics, Federal Trade Commission, Washington, DC.
Insights
Increased cardiology market concentration is linked to worse patient health outcomes and higher healthcare spending. This consolidation may negatively impact mortality rates and increase overall expenditures for certain patient groups.
Area of Science:
- Health Economics
- Clinical Outcomes Research
- Healthcare Market Analysis
Background:
- Physician market structure significantly influences healthcare delivery and patient outcomes.
- Understanding the impact of market consolidation is crucial for healthcare policy and quality improvement.
Purpose of the Study:
- To investigate the relationship between cardiology physician market structure and clinical outcomes.
- To assess the effect of market concentration on healthcare utilization and patient mortality.
Main Methods:
- Analysis of Medicare fee-for-service claims and enrollment data from 2005-2012.
- Utilized multivariate regression models to estimate risk-adjusted impacts of competition.
- Focused on four distinct patient populations within the cardiology market.
Main Results:
- Increased market concentration correlated with statistically significant rises in adverse health outcomes, including mortality.
- A move from lower to higher concentration was associated with 5-7% increases in risk-adjusted mortality for three patient groups.
- Higher healthcare expenditures were observed in more concentrated markets, with increases of 7-11%.
Conclusions:
- Cardiology market concentration is associated with diminished health outcomes and elevated healthcare costs.
- Findings suggest potential contributions from both horizontal and vertical market changes.
- Policy implications may involve addressing market consolidation to improve patient care and reduce spending.
Objective:
To understand the impact of changes in physician market structure on clinical outcomes and health care utilization.
Data Sources:
2005-2012 Medicare fee-for-service claims and enrollment data.
Study Design:
We consider the effect of cardiology market structure on utilization and health outcomes for four patient populations. We estimate the risk-adjusted impact of competition using multivariate regression models.
Principal Findings:
The study finds that an increase in consolidation leads to statistically and economically significant increases in negative health outcomes. For example, we find that moving from a zip code at the 25th percentile of cardiology market concentration to one at the 75th percentile would be associated with 5 to 7 percent increases in risk-adjusted mortality for three of the sample populations. We also found higher expenditures in more concentrated markets. For example, moving from a zip code at the 25th percentile of cardiology market concentration to one at the 75th would be associated with 7 to 11 percent increases in expenditures, depending on sample population.
Conclusions:
Our estimates indicate that increases in cardiology market concentration are associated with worse health outcomes and higher health care expenditures. Some effects may be attributed to vertical as well as horizontal changes.
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