House Energy & Commerce Chairman Frank Pallone (D-NJ) and ranking Republican Greg Walden (OR) launched an investigation into private equity firms’ role in surprise medical billing, starting with three firms that own physician staffing companies and emergency transport companies. The investigation was launched Monday (Sept. 16), soon after such firms were revealed as the driving force behind a series of dark money ads lobbying against the House and Senate’s proposed surprise billing fixes. "Evidence indicates that these physician staffing firms...