New research published in the JAMA Internal Medicine journal supports, with rigorous data analysis, that hospital ownership of medical practices drives up costs:
Among the 240 Metropolitan Statistical Areas, physician-hospital integration increased from 2008 to 2012 by a mean of 3.3 percentage points, with considerable variation in increases across MSAs. For our study sample of 7,391,335 nonelderly enrollees, an increase in physician-hospital integration equivalent to the 75th percentile of changes experienced by MSAs was associated with a mean increase of $75 per enrollee in annual outpatient spending from 2008 to 2012, a 3.1% increase relative to mean outpatient spending in 2012). This increase in outpatient spending was driven almost entirely by price increases because associated changes in utilization were minimal (corresponding change in price-standardized spending, $14). Changes in physician-hospital integration were not associated with significant changes in inpatient spending ($22 per enrollee) or utilization ($10 per enrollee).
(Note: I have edited out the measures of statistical significance from the abstract, for ease of reading.)
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