Correction on ownership breakdown: A CMS cost report expert flagged that my CTRL_TYPE mapping in the HCRIS processing script was wrong — I had for-profit and nonprofit hospital categories swapped. The corrected figures: for-profit hospitals have a 4.11x median markup (highest), nonprofits 2.46x, government 2.22x. The 254% commercial-to-Medicare finding ($73B savings estimate) is unaffected — that's from RAND, not my HCRIS analysis. Corrected code and a full audit report are on GitHub. This is exactly why the code is open-source.